diff --git a/rsconcept/backend/apps/rsform/models/api_RSForm.py b/rsconcept/backend/apps/rsform/models/api_RSForm.py
index f08d46da..0ca20588 100644
--- a/rsconcept/backend/apps/rsform/models/api_RSForm.py
+++ b/rsconcept/backend/apps/rsform/models/api_RSForm.py
@@ -1,12 +1,12 @@
 ''' Models: RSForm API. '''
-from typing import Dict, Iterable, Optional, cast
+from typing import Dict, Iterable, Optional, Union, cast
 
 from django.db import transaction
 from django.db.models import QuerySet
 from django.core.exceptions import ValidationError
 
 from cctext import Resolver, Entity, extract_entities, split_grams, TermForm
-from .api_RSLanguage import get_type_prefix, generate_structure
+from .api_RSLanguage import get_type_prefix, generate_structure, guess_type
 from .LibraryItem import LibraryItem, LibraryItemType
 from .Constituenta import CstType, Constituenta
 from .Version import Version
@@ -90,18 +90,27 @@ class RSForm:
         return result
 
     @transaction.atomic
-    def insert_new(self, alias: str, insert_type: CstType, position: int = _INSERT_LAST) -> Constituenta:
+    def insert_new(
+        self,
+        alias: str,
+        cst_type: Union[CstType, None] = None,
+        position: int = _INSERT_LAST,
+        **kwargs
+    ) -> Constituenta:
         ''' Insert new constituenta at given position.
             All following constituents order is shifted by 1 position. '''
         if self.constituents().filter(alias=alias).exists():
             raise ValidationError(msg.aliasTaken(alias))
         position = self._get_insert_position(position)
+        if cst_type is None:
+            cst_type = guess_type(alias)
         self._shift_positions(position, 1)
         result = Constituenta.objects.create(
             schema=self.item,
             order=position,
             alias=alias,
-            cst_type=insert_type
+            cst_type=cst_type,
+            **kwargs
         )
         self.item.save()
         result.refresh_from_db()
diff --git a/rsconcept/backend/apps/rsform/models/api_RSLanguage.py b/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
index 44060cf8..42829571 100644
--- a/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
+++ b/rsconcept/backend/apps/rsform/models/api_RSLanguage.py
@@ -1,6 +1,6 @@
 ''' Models: Definitions and utility function for RSLanguage. '''
 import json
-from typing import Tuple
+from typing import Tuple, cast
 from enum import IntEnum , unique
 
 from django.db.models import TextChoices
@@ -54,6 +54,14 @@ def get_type_prefix(cst_type: CstType) -> str:
         return 'T'
     return 'X'
 
+def guess_type(alias: str) -> CstType:
+    ''' Get CstType for alias. '''
+    prefix = alias[0]
+    for (value, _) in CstType.choices:
+        if prefix == get_type_prefix(cast(CstType, value)):
+            return cast(CstType, value)
+    return CstType.BASE
+
 def _get_structure_prefix(alias: str, expression: str, parse: dict) -> Tuple[str, str]:
     ''' Generate prefix and alias for structure generation. '''
     args = parse['args']
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/EndpointTester.py b/rsconcept/backend/apps/rsform/tests/s_views/EndpointTester.py
new file mode 100644
index 00000000..95306109
--- /dev/null
+++ b/rsconcept/backend/apps/rsform/tests/s_views/EndpointTester.py
@@ -0,0 +1,140 @@
+''' Utils: base tester class for endpoints. '''
+from rest_framework.test import APITestCase, APIRequestFactory, APIClient
+from rest_framework import status
+
+from apps.users.models import User
+
+
+def decl_endpoint(endpoint: str, method: str):
+    ''' Decorator for EndpointTester methods to provide API attributes. '''
+    def set_endpoint_inner(function):
+        def wrapper(*args, **kwargs):
+            if '{' in endpoint:
+                args[0].endpoint = 'UNRESOLVED'
+                args[0].endpoint_mask = endpoint
+            else:
+                args[0].endpoint_mask = None
+                args[0].endpoint = endpoint
+            args[0].method = method
+            return function(*args, **kwargs)
+        return wrapper
+    return set_endpoint_inner
+
+
+class EndpointTester(APITestCase):
+    ''' Abstract base class for Testing endpoints. '''
+    def setUp(self):
+        self.factory = APIRequestFactory()
+        self.user = User.objects.create(username='UserTest')
+        self.client = APIClient()
+        self.client.force_authenticate(user=self.user)
+
+    def toggle_staff(self, value: bool = True):
+        self.user.is_staff = value
+        self.user.save()
+
+    def login(self):
+        self.client.force_authenticate(user=self.user)
+
+    def logout(self):
+        self.client.logout()
+
+    def set_params(self, **kwargs):
+        ''' Given named argument values resolve current endpoint_mask. '''
+        if self.endpoint_mask and len(kwargs) > 0:
+            self.endpoint = _resolve_url(self.endpoint_mask, **kwargs)
+
+    def get(self, endpoint: str = '', **kwargs):
+        if endpoint != '':
+            return self.client.get(endpoint)
+        else:
+            self.set_params(**kwargs)
+            return self.client.get(self.endpoint)
+
+    def post(self, data=None, **kwargs):
+        self.set_params(**kwargs)
+        if not data is None:
+            return self.client.post(self.endpoint, data=data, format='json')
+        else:
+            return self.client.post(self.endpoint)
+
+    def patch(self, data=None, **kwargs):
+        self.set_params(**kwargs)
+        if not data is None:
+            return self.client.patch(self.endpoint, data=data, format='json')
+        else:
+            return self.client.patch(self.endpoint)
+
+    def put(self, data, **kwargs):
+        self.set_params(**kwargs)
+        return self.client.get(self.endpoint, data=data, format='json')
+
+    def delete(self, data=None, **kwargs):
+        self.set_params(**kwargs)
+        if not data is None:
+            return self.client.delete(self.endpoint, data=data, format='json')
+        else:
+            return self.client.delete(self.endpoint)
+
+    def assertOK(self, data=None, **kwargs):
+        response = self.execute(data, **kwargs)
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+    def assertBadData(self, data=None, **kwargs):
+        response = self.execute(data, **kwargs)
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+
+    def assertForbidden(self, data=None, **kwargs):
+        response = self.execute(data, **kwargs)
+        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+
+    def assertNotModified(self, data=None, **kwargs):
+        response = self.execute(data, **kwargs)
+        self.assertEqual(response.status_code, status.HTTP_304_NOT_MODIFIED)
+
+    def assertNotFound(self, data=None, **kwargs):
+        response = self.execute(data, **kwargs)
+        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+
+    def execute(self, data=None, **kwargs):
+        if self.method == 'get':
+            return self.get(**kwargs)
+        if self.method == 'post':
+            return self.post(data, **kwargs)
+        if self.method == 'put':
+            return self.put(data, **kwargs)
+        if self.method == 'patch':
+            return self.patch(data, **kwargs)
+        if self.method == 'delete':
+            return self.delete(data, **kwargs)
+        return None
+
+
+def _resolve_url(url: str, **kwargs) -> str:
+    if url == '' or len(kwargs) == 0:
+        return url
+    pos_input: int = 0
+    pos_start: int = 0
+    pos_end: int = 0
+    arg_names = set()
+    output: str = ''
+    while True:
+        pos_start = url.find('{', pos_input)
+        if pos_start == -1:
+            break
+        pos_end = url.find('}', pos_start)
+        if pos_end == -1:
+            break
+        name = url[(pos_start + 1) : pos_end]
+        arg_names.add(name)
+        if not name in kwargs:
+            raise KeyError(f'Missing argument: {name} | Mask: {url}')
+        output += url[pos_input : pos_start]
+        output += str(kwargs[name])
+        pos_input = pos_end + 1
+    if pos_input < len(url):
+        output += url[pos_input : len(url)]
+    for (key, _) in kwargs.items():
+        if key not in arg_names:
+            raise KeyError(f'Unused argument: {name} | Mask: {url}')
+    return output
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py b/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py
index df22165c..796d18e5 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_cctext.py
@@ -1,63 +1,34 @@
 ''' Testing views '''
-import os
-import io
-from zipfile import ZipFile
-from rest_framework.test import APITestCase, APIRequestFactory, APIClient
-from rest_framework.exceptions import ErrorDetail
 from rest_framework import status
 
-from cctext import ReferenceType, split_grams
+from cctext import split_grams
 
-from apps.users.models import User
-from apps.rsform.models import (
-  RSForm, Constituenta, CstType,
-  LibraryItem, LibraryItemType, Subscription, LibraryTemplate
-)
-from apps.rsform.views import (
-    convert_to_ascii,
-    convert_to_math,
-    parse_expression,
-    inflect,
-    parse_text,
-    generate_lexeme
-)
+from .EndpointTester import decl_endpoint, EndpointTester
 
 
-class TestNaturalLanguageViews(APITestCase):
-    def setUp(self):
-        self.factory = APIRequestFactory()
-        self.client = APIClient()
-
+class TestNaturalLanguageViews(EndpointTester):
+    ''' Test natural language endpoints. '''
     def _assert_tags(self, actual: str, expected: str):
         self.assertEqual(set(split_grams(actual)), set(split_grams(expected)))
 
+    @decl_endpoint(endpoint='/api/cctext/parse', method='post')
     def test_parse_text(self):
         data = {'text': 'синим слонам'}
-        request = self.factory.post(
-            '/api/cctext/parse',
-            data=data, format='json'
-        )
-        response = parse_text(request)
+        response = self.execute(data)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self._assert_tags(response.data['result'], 'datv,NOUN,plur,anim,masc')
 
+    @decl_endpoint(endpoint='/api/cctext/inflect', method='post')
     def test_inflect(self):
         data = {'text': 'синий слон', 'grams': 'plur,datv'}
-        request = self.factory.post(
-            '/api/cctext/inflect',
-            data=data, format='json'
-        )
-        response = inflect(request)
+        response = self.execute(data)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['result'], 'синим слонам')
 
+    @decl_endpoint(endpoint='/api/cctext/generate-lexeme', method='post')
     def test_generate_lexeme(self):
         data = {'text': 'синий слон'}
-        request = self.factory.post(
-            '/api/cctext/generate-lexeme',
-            data=data, format='json'
-        )
-        response = generate_lexeme(request)
+        response = self.execute(data)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(len(response.data['items']), 12)
         self.assertEqual(response.data['items'][0]['text'], 'синий слон')
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py b/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py
index 63e0ead1..95e9b30d 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_constituents.py
@@ -1,22 +1,20 @@
 ''' Testing API: Constituents. '''
-from rest_framework.test import APITestCase, APIRequestFactory, APIClient
 from rest_framework import status
 
-from apps.users.models import User
 from apps.rsform.models import RSForm, Constituenta, CstType
 
+from .EndpointTester import decl_endpoint, EndpointTester
 
-class TestConstituentaAPI(APITestCase):
+
+class TestConstituentaAPI(EndpointTester):
     ''' Testing Constituenta view. '''
     def setUp(self):
-        self.factory = APIRequestFactory()
-        self.user = User.objects.create(username='UserTest')
-        self.client = APIClient()
-        self.client.force_authenticate(user=self.user)
+        super().setUp()
         self.rsform_owned = RSForm.create(title='Test', alias='T1', owner=self.user)
         self.rsform_unowned = RSForm.create(title='Test2', alias='T2')
         self.cst1 = Constituenta.objects.create(
             alias='X1',
+            cst_type=CstType.BASE,
             schema=self.rsform_owned.item,
             order=1,
             convention='Test',
@@ -25,6 +23,7 @@ class TestConstituentaAPI(APITestCase):
             term_forms=[{'text':'form1', 'tags':'sing,datv'}])
         self.cst2 = Constituenta.objects.create(
             alias='X2',
+            cst_type=CstType.BASE,
             schema=self.rsform_unowned.item,
             order=1,
             convention='Test1',
@@ -40,51 +39,40 @@ class TestConstituentaAPI(APITestCase):
             definition_raw='Test1',
             definition_resolved='Test2'
         )
+        self.invalid_cst = self.cst3.pk + 1337
 
+    @decl_endpoint('/api/constituents/{item}', method='get')
     def test_retrieve(self):
-        response = self.client.get(f'/api/constituents/{self.cst1.id}')
+        self.assertNotFound(item=self.invalid_cst)
+        response = self.execute(item=self.cst1.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['alias'], self.cst1.alias)
         self.assertEqual(response.data['convention'], self.cst1.convention)
 
+    @decl_endpoint('/api/constituents/{item}', method='patch')
     def test_partial_update(self):
         data = {'convention': 'tt'}
-        response = self.client.patch(
-            f'/api/constituents/{self.cst2.id}',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.assertForbidden(data, item=self.cst2.id)
 
-        self.client.logout()
-        response = self.client.patch(
-            f'/api/constituents/{self.cst1.id}',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.logout()
+        self.assertForbidden(data, item=self.cst1.id)
 
-        self.client.force_authenticate(user=self.user)
-        response = self.client.patch(
-            f'/api/constituents/{self.cst1.id}',
-            data=data, format='json'
-        )
+        self.login()
+        response = self.execute(data, item=self.cst1.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.cst1.refresh_from_db()
         self.assertEqual(response.data['convention'], 'tt')
         self.assertEqual(self.cst1.convention, 'tt')
 
-        response = self.client.patch(
-            f'/api/constituents/{self.cst1.id}',
-            data=data,
-            format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertOK(data, item=self.cst1.id)
 
+    @decl_endpoint('/api/constituents/{item}', method='patch')
     def test_update_resolved_no_refs(self):
         data = {
             'term_raw': 'New term',
             'definition_raw': 'New def'
         }
-        response = self.client.patch(f'/api/constituents/{self.cst3.id}', data, format='json')
+        response = self.execute(data, item=self.cst3.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.cst3.refresh_from_db()
         self.assertEqual(response.data['term_resolved'], 'New term')
@@ -92,15 +80,13 @@ class TestConstituentaAPI(APITestCase):
         self.assertEqual(response.data['definition_resolved'], 'New def')
         self.assertEqual(self.cst3.definition_resolved, 'New def')
 
+    @decl_endpoint('/api/constituents/{item}', method='patch')
     def test_update_resolved_refs(self):
         data = {
             'term_raw': '@{X1|nomn,sing}',
             'definition_raw': '@{X1|nomn,sing} @{X1|sing,datv}'
         }
-        response = self.client.patch(
-            f'/api/constituents/{self.cst3.id}',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=self.cst3.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.cst3.refresh_from_db()
         self.assertEqual(self.cst3.term_resolved, self.cst1.term_resolved)
@@ -108,12 +94,10 @@ class TestConstituentaAPI(APITestCase):
         self.assertEqual(self.cst3.definition_resolved, f'{self.cst1.term_resolved} form1')
         self.assertEqual(response.data['definition_resolved'], f'{self.cst1.term_resolved} form1')
 
+    @decl_endpoint('/api/constituents/{item}', method='patch')
     def test_readonly_cst_fields(self):
         data = {'alias': 'X33', 'order': 10}
-        response = self.client.patch(
-            f'/api/constituents/{self.cst1.id}',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=self.cst1.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['alias'], 'X1')
         self.assertEqual(response.data['alias'], self.cst1.alias)
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_library.py b/rsconcept/backend/apps/rsform/tests/s_views/t_library.py
index fd36ddab..6d393845 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_library.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_library.py
@@ -1,26 +1,25 @@
 ''' Testing API: Library. '''
-from rest_framework.test import APITestCase, APIRequestFactory, APIClient
 from rest_framework import status
 
 from apps.users.models import User
-from apps.rsform.models import LibraryItem, LibraryItemType, Subscription, LibraryTemplate
+from apps.rsform.models import LibraryItem, LibraryItemType, Subscription, LibraryTemplate, RSForm
 
 from ..utils import response_contains
 
+from .EndpointTester import decl_endpoint, EndpointTester
 
-class TestLibraryViewset(APITestCase):
+
+class TestLibraryViewset(EndpointTester):
     ''' Testing Library view. '''
     def setUp(self):
-        self.factory = APIRequestFactory()
-        self.user = User.objects.create(username='UserTest')
-        self.client = APIClient()
-        self.client.force_authenticate(user=self.user)
+        super().setUp()
         self.owned = LibraryItem.objects.create(
             item_type=LibraryItemType.RSFORM,
             title='Test',
             alias='T1',
             owner=self.user
         )
+        self.schema = RSForm(self.owned)
         self.unowned = LibraryItem.objects.create(
             item_type=LibraryItemType.RSFORM,
             title='Test2',
@@ -33,93 +32,79 @@ class TestLibraryViewset(APITestCase):
             is_common=True
         )
 
-    def test_create_anonymous(self):
-        self.client.logout()
+    @decl_endpoint('/api/library', method='post')
+    def test_create(self):
         data = {'title': 'Title'}
-        response = self.client.post('/api/library', data=data, format='json')
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-
-    def test_create_populate_user(self):
-        data = {'title': 'Title'}
-        response = self.client.post('/api/library', data=data, format='json')
+        response = self.post(data=data)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['title'], 'Title')
         self.assertEqual(response.data['owner'], self.user.id)
 
+        self.logout()
+        data = {'title': 'Title2'}
+        self.assertForbidden(data)
+
+    @decl_endpoint('/api/library/{item}', method='patch')
     def test_update(self):
+        data = {'id': self.unowned.id, 'title': 'New title'}
+        self.assertForbidden(data, item=self.unowned.id)
+
         data = {'id': self.owned.id, 'title': 'New title'}
-        response = self.client.patch(
-            f'/api/library/{self.owned.id}',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=self.owned.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['title'], 'New title')
         self.assertEqual(response.data['alias'], self.owned.alias)
 
-    def test_update_unowned(self):
-        data = {'id': self.unowned.id, 'title': 'New title'}
-        response = self.client.patch(
-            f'/api/library/{self.unowned.id}',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-
+    @decl_endpoint('/api/library/{item}', method='delete')
     def test_destroy(self):
-        response = self.client.delete(f'/api/library/{self.owned.id}')
+        response = self.execute(item=self.owned.id)
         self.assertTrue(response.status_code in [status.HTTP_202_ACCEPTED, status.HTTP_204_NO_CONTENT])
 
-    def test_destroy_admin_override(self):
-        response = self.client.delete(f'/api/library/{self.unowned.id}')
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-        self.user.is_staff = True
-        self.user.save()
-        response = self.client.delete(f'/api/library/{self.unowned.id}')
+        self.assertForbidden(item=self.unowned.id)
+        self.toggle_staff(True)
+        response = self.execute(item=self.unowned.id)
         self.assertTrue(response.status_code in [status.HTTP_202_ACCEPTED, status.HTTP_204_NO_CONTENT])
 
+    @decl_endpoint('/api/library/{item}/claim', method='post')
     def test_claim(self):
-        response = self.client.post(f'/api/library/{self.owned.id}/claim')
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.assertForbidden(item=self.owned.id)
 
         self.owned.is_common = True
         self.owned.save()
-        response = self.client.post(f'/api/library/{self.owned.id}/claim')
-        self.assertEqual(response.status_code, status.HTTP_304_NOT_MODIFIED)
-
-        response = self.client.post(f'/api/library/{self.unowned.id}/claim')
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.assertNotModified(item=self.owned.id)
+        self.assertForbidden(item=self.unowned.id)
 
         self.assertFalse(self.user in self.unowned.subscribers())
         self.unowned.is_common = True
         self.unowned.save()
-        response = self.client.post(f'/api/library/{self.unowned.id}/claim')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+        self.assertOK(item=self.unowned.id)
         self.unowned.refresh_from_db()
         self.assertEqual(self.unowned.owner, self.user)
         self.assertEqual(self.unowned.owner, self.user)
         self.assertTrue(self.user in self.unowned.subscribers())
 
-    def test_claim_anonymous(self):
-        self.client.logout()
-        response = self.client.post(f'/api/library/{self.owned.id}/claim')
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.logout()
+        self.assertForbidden(item=self.owned.id)
 
+    @decl_endpoint('/api/library/active', method='get')
     def test_retrieve_common(self):
-        self.client.logout()
-        response = self.client.get('/api/library/active')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertTrue(response_contains(response, self.common))
-        self.assertFalse(response_contains(response, self.unowned))
-        self.assertFalse(response_contains(response, self.owned))
-
-    def test_retrieve_owned(self):
-        response = self.client.get('/api/library/active')
+        response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertTrue(response_contains(response, self.common))
         self.assertFalse(response_contains(response, self.unowned))
         self.assertTrue(response_contains(response, self.owned))
 
+        self.logout()
+        response = self.execute()
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertTrue(response_contains(response, self.common))
+        self.assertFalse(response_contains(response, self.unowned))
+        self.assertFalse(response_contains(response, self.owned))
+
+    @decl_endpoint('/api/library/active', method='get')
     def test_retrieve_subscribed(self):
-        response = self.client.get('/api/library/active')
+        response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertFalse(response_contains(response, self.unowned))
 
@@ -127,21 +112,23 @@ class TestLibraryViewset(APITestCase):
         Subscription.subscribe(user=self.user, item=self.unowned)
         Subscription.subscribe(user=user2, item=self.unowned)
         Subscription.subscribe(user=user2, item=self.owned)
-        response = self.client.get('/api/library/active')
+
+        response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertTrue(response_contains(response, self.unowned))
         self.assertEqual(len(response.data), 3)
 
+    @decl_endpoint('/api/library/{item}/subscribe', method='post')
     def test_subscriptions(self):
         response = self.client.delete(f'/api/library/{self.unowned.id}/unsubscribe')
         self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
         self.assertFalse(self.user in self.unowned.subscribers())
 
-        response = self.client.post(f'/api/library/{self.unowned.id}/subscribe')
+        response = self.execute(item=self.unowned.id)
         self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
         self.assertTrue(self.user in self.unowned.subscribers())
 
-        response = self.client.post(f'/api/library/{self.unowned.id}/subscribe')
+        response = self.execute(item=self.unowned.id)
         self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
         self.assertTrue(self.user in self.unowned.subscribers())
 
@@ -149,16 +136,40 @@ class TestLibraryViewset(APITestCase):
         self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
         self.assertFalse(self.user in self.unowned.subscribers())
 
+    @decl_endpoint('/api/library/templates', method='get')
     def test_retrieve_templates(self):
-        response = self.client.get('/api/library/templates')
+        response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertFalse(response_contains(response, self.common))
         self.assertFalse(response_contains(response, self.unowned))
         self.assertFalse(response_contains(response, self.owned))
 
         LibraryTemplate.objects.create(lib_source=self.unowned)
-        response = self.client.get('/api/library/templates')
+        response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertFalse(response_contains(response, self.common))
         self.assertTrue(response_contains(response, self.unowned))
         self.assertFalse(response_contains(response, self.owned))
+
+    @decl_endpoint('/api/library/{item}/clone', method='post')
+    def test_clone_rsform(self):
+        x12 = self.schema.insert_new(
+            alias='X12',
+            term_raw = 'человек',
+            term_resolved = 'человек'
+        )
+        d2 = self.schema.insert_new(
+            alias='D2',
+            term_raw = '@{X12|plur}',
+            term_resolved = 'люди'
+        )
+
+        data = {'title': 'Title1337'}
+        response = self.execute(data, item=self.owned.id)
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(response.data['title'], data['title'])
+        self.assertEqual(response.data['items'][0]['alias'], x12.alias)
+        self.assertEqual(response.data['items'][0]['term_raw'], x12.term_raw)
+        self.assertEqual(response.data['items'][0]['term_resolved'], x12.term_resolved)
+        self.assertEqual(response.data['items'][1]['term_raw'], d2.term_raw)
+        self.assertEqual(response.data['items'][1]['term_resolved'], d2.term_resolved)
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py b/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py
index 0c82ea1c..c1fc0820 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_rsforms.py
@@ -2,10 +2,8 @@
 import os
 import io
 from zipfile import ZipFile
-from rest_framework.test import APITestCase, APIRequestFactory, APIClient
 from rest_framework import status
 
-from apps.users.models import User
 from apps.rsform.models import (
   RSForm,
   Constituenta,
@@ -17,44 +15,69 @@ from apps.rsform.models import (
 from cctext import ReferenceType
 from ..utils import response_contains
 
+from .EndpointTester import decl_endpoint, EndpointTester
 
-class TestRSFormViewset(APITestCase):
+
+class TestRSFormViewset(EndpointTester):
     ''' Testing RSForm view. '''
     def setUp(self):
-        self.factory = APIRequestFactory()
-        self.user = User.objects.create(username='UserTest')
-        self.client = APIClient()
-        self.client.force_authenticate(user=self.user)
-        self.owned = RSForm.create(title='Test', alias='T1', owner=self.user)
+        super().setUp()
+        self.schema = RSForm.create(title='Test', alias='T1', owner=self.user)
+        self.schema_id = self.schema.item.id
         self.unowned = RSForm.create(title='Test2', alias='T2')
+        self.unowned_id = self.unowned.item.id
 
+    @decl_endpoint('/api/rsforms/create-detailed', method='post')
+    def test_create_rsform_file(self):
+        work_dir = os.path.dirname(os.path.abspath(__file__))
+        with open(f'{work_dir}/data/sample-rsform.trs', 'rb') as file:
+            data = {'file': file, 'title': 'Test123', 'comment': '123', 'alias': 'ks1'}
+            response = self.client.post(self.endpoint, data=data, format='multipart')
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(response.data['owner'], self.user.pk)
+        self.assertEqual(response.data['title'], 'Test123')
+        self.assertEqual(response.data['alias'], 'ks1')
+        self.assertEqual(response.data['comment'], '123')
+
+    @decl_endpoint('/api/rsforms/create-detailed', method='post')
+    def test_create_rsform_json(self):
+        data = {'title': 'Test123', 'comment': '123', 'alias': 'ks1'}
+        response = self.execute(data)
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(response.data['owner'], self.user.pk)
+        self.assertEqual(response.data['title'], 'Test123')
+        self.assertEqual(response.data['alias'], 'ks1')
+        self.assertEqual(response.data['comment'], '123')
+
+    @decl_endpoint('/api/rsforms', method='get')
     def test_list(self):
         non_schema = LibraryItem.objects.create(
             item_type=LibraryItemType.OPERATIONS_SCHEMA,
             title='Test3'
         )
-        response = self.client.get('/api/rsforms')
+        response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertFalse(response_contains(response, non_schema))
         self.assertTrue(response_contains(response, self.unowned.item))
-        self.assertTrue(response_contains(response, self.owned.item))
+        self.assertTrue(response_contains(response, self.schema.item))
 
         response = self.client.get('/api/library')
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertTrue(response_contains(response, non_schema))
         self.assertTrue(response_contains(response, self.unowned.item))
-        self.assertTrue(response_contains(response, self.owned.item))
+        self.assertTrue(response_contains(response, self.schema.item))
 
+    @decl_endpoint('/api/rsforms/{item}/contents', method='get')
     def test_contents(self):
         schema = RSForm.create(title='Title1')
-        schema.insert_new(alias='X1', insert_type=CstType.BASE)
-        response = self.client.get(f'/api/rsforms/{schema.item.id}/contents')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        schema.insert_new('X1')
+        self.assertOK(item=schema.item.id)
 
+    @decl_endpoint('/api/rsforms/{item}/details', method='get')
     def test_details(self):
         schema = RSForm.create(title='Test', owner=self.user)
-        x1 = schema.insert_new('X1', CstType.BASE, 1)
-        x2 = schema.insert_new('X2', CstType.BASE, 2)
+        x1 = schema.insert_new('X1')
+        x2 = schema.insert_new('X2')
         x1.term_raw = 'человек'
         x1.term_resolved = 'человек'
         x2.term_raw = '@{X1|plur}'
@@ -62,8 +85,7 @@ class TestRSFormViewset(APITestCase):
         x1.save()
         x2.save()
 
-        response = self.client.get(f'/api/rsforms/{schema.item.id}/details')
-
+        response = self.execute(item=schema.item.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['title'], 'Test')
         self.assertEqual(len(response.data['items']), 2)
@@ -76,14 +98,12 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(response.data['items'][1]['term_resolved'], x2.term_resolved)
         self.assertEqual(response.data['subscribers'], [self.user.pk])
 
+    @decl_endpoint('/api/rsforms/{item}/check', method='post')
     def test_check(self):
         schema = RSForm.create(title='Test')
-        schema.insert_new('X1', CstType.BASE, 1)
+        schema.insert_new('X1')
         data = {'expression': 'X1=X1'}
-        response = self.client.post(
-            f'/api/rsforms/{schema.item.id}/check',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=schema.item.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['parseResult'], True)
         self.assertEqual(response.data['syntax'], 'math')
@@ -91,22 +111,17 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(response.data['typification'], 'LOGIC')
         self.assertEqual(response.data['valueClass'], 'value')
 
-        response = self.client.post(
-            f'/api/rsforms/{self.unowned.item.id}/check',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertOK(data, item=self.unowned_id)
 
+    @decl_endpoint('/api/rsforms/{item}/resolve', method='post')
     def test_resolve(self):
         schema = RSForm.create(title='Test')
-        x1 = schema.insert_new('X1', CstType.BASE, 1)
+        x1 = schema.insert_new('X1')
         x1.term_resolved = 'синий слон'
         x1.save()
+
         data = {'text': '@{1|редкий} @{X1|plur,datv}'}
-        response = self.client.post(
-            f'/api/rsforms/{schema.item.id}/resolve',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=schema.item.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['input'], '@{1|редкий} @{X1|plur,datv}')
         self.assertEqual(response.data['output'], 'редким синим слонам')
@@ -128,19 +143,21 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(response.data['refs'][1]['pos_output']['start'], 7)
         self.assertEqual(response.data['refs'][1]['pos_output']['finish'], 19)
 
+    @decl_endpoint('/api/rsforms/import-trs', method='post')
     def test_import_trs(self):
         work_dir = os.path.dirname(os.path.abspath(__file__))
         with open(f'{work_dir}/data/sample-rsform.trs', 'rb') as file:
             data = {'file': file}
-            response = self.client.post('/api/rsforms/import-trs', data=data, format='multipart')
+            response = self.client.post(self.endpoint, data=data, format='multipart')
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['owner'], self.user.pk)
         self.assertTrue(response.data['title'] != '')
 
+    @decl_endpoint('/api/rsforms/{item}/export-trs', method='get')
     def test_export_trs(self):
         schema = RSForm.create(title='Test')
-        schema.insert_new('X1', CstType.BASE, 1)
-        response = self.client.get(f'/api/rsforms/{schema.item.id}/export-trs')
+        schema.insert_new('X1')
+        response = self.execute(item=schema.item.id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.headers['Content-Disposition'], 'attachment; filename=Schema.trs')
         with io.BytesIO(response.content) as stream:
@@ -148,31 +165,15 @@ class TestRSFormViewset(APITestCase):
                 self.assertIsNone(zipped_file.testzip())
                 self.assertIn('document.json', zipped_file.namelist())
 
+    @decl_endpoint('/api/rsforms/{item}/cst-create', method='post')
     def test_create_constituenta(self):
-        data = {'alias': 'X3', 'cst_type': 'basic'}
-        response = self.client.post(
-            f'/api/rsforms/{self.unowned.item.id}/cst-create',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        data = {'alias': 'X3', 'cst_type':  CstType.BASE}
+        self.assertForbidden(data, item=self.unowned_id)
 
-        item = self.owned.item
-        Constituenta.objects.create(
-            schema=item,
-            alias='X1',
-            cst_type='basic',
-            order=1
-        )
-        x2 = Constituenta.objects.create(
-            schema=item,
-            alias='X2',
-            cst_type='basic',
-            order=2
-        )
-        response = self.client.post(
-            f'/api/rsforms/{item.id}/cst-create',
-            data=data, format='json'
-        )
+        self.schema.insert_new('X1')
+        x2 = self.schema.insert_new('X2')
+
+        response = self.execute(data, item=self.schema_id)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['new_cst']['alias'], 'X3')
         x3 = Constituenta.objects.get(alias=response.data['new_cst']['alias'])
@@ -180,15 +181,12 @@ class TestRSFormViewset(APITestCase):
 
         data = {
             'alias': 'X4',
-            'cst_type': 'basic',
+            'cst_type': CstType.BASE,
             'insert_after': x2.id,
             'term_raw': 'test',
             'term_forms': [{'text':'form1', 'tags':'sing,datv'}]
         }
-        response = self.client.post(
-            f'/api/rsforms/{item.id}/cst-create',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=self.schema_id)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['new_cst']['alias'], data['alias'])
         x4 = Constituenta.objects.get(alias=response.data['new_cst']['alias'])
@@ -196,144 +194,87 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(x4.term_raw, data['term_raw'])
         self.assertEqual(x4.term_forms, data['term_forms'])
 
+    @decl_endpoint('/api/rsforms/{item}/cst-rename', method='patch')
     def test_rename_constituenta(self):
-        cst1 = Constituenta.objects.create(
+        x1 = self.schema.insert_new(
             alias='X1',
-            schema=self.owned.item,
-            order=1,
             convention='Test',
             term_raw='Test1',
             term_resolved='Test1',
             term_forms=[{'text':'form1', 'tags':'sing,datv'}]
         )
-        cst2 = Constituenta.objects.create(
-            alias='X2',
-            schema=self.unowned.item,
-            order=1
-        )
-        cst3 = Constituenta.objects.create(
+        x2_2 = self.unowned.insert_new('X2')
+        x3 = self.schema.insert_new(
             alias='X3',
-            schema=self.owned.item, order=2,
             term_raw='Test3',
             term_resolved='Test3',
             definition_raw='Test1',
             definition_resolved='Test2'
         )
         
-        data = {'target': cst2.pk, 'alias': 'D2', 'cst_type': 'term'}
-        response = self.client.patch(
-            f'/api/rsforms/{self.unowned.item.id}/cst-rename',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        data = {'target': x2_2.pk, 'alias': 'D2', 'cst_type': CstType.TERM}
+        self.assertForbidden(data, item=self.unowned_id)
+        self.assertBadData(data, item=self.schema_id)
 
-        response = self.client.patch(
-            f'/api/rsforms/{self.owned.item.id}/cst-rename',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        data = {'target': x1.pk, 'alias': x1.alias, 'cst_type': CstType.TERM}
+        self.assertBadData(data, item=self.schema_id)
 
-        data = {'target': cst1.pk, 'alias': cst1.alias, 'cst_type': 'term'}
-        response = self.client.patch(
-            f'/api/rsforms/{self.owned.item.id}/cst-rename',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        data = {'target': x1.pk, 'alias': x3.alias}
+        self.assertBadData(data, item=self.schema_id)
 
-        data = {'target': cst1.pk, 'alias': cst3.alias}
-        response = self.client.patch(
-            f'/api/rsforms/{self.owned.item.id}/cst-rename',
-            data=data, format='json'
+        d1 = self.schema.insert_new(
+            alias='D1',
+            term_raw = '@{X1|plur}',
+            definition_formal = 'X1'
         )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(x1.order, 1)
+        self.assertEqual(x1.alias, 'X1')
+        self.assertEqual(x1.cst_type, CstType.BASE)
 
-        data = {'target': cst1.pk, 'alias': 'D2', 'cst_type': 'term'}
-        item = self.owned.item
-        d1 = Constituenta.objects.create(schema=item, alias='D1', cst_type='term', order=4)
-        d1.term_raw = '@{X1|plur}'
-        d1.definition_formal = 'X1'
-        d1.save()
-        
-        self.assertEqual(d1.order, 4)
-        self.assertEqual(cst1.order, 1)
-        self.assertEqual(cst1.alias, 'X1')
-        self.assertEqual(cst1.cst_type, CstType.BASE)
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-rename',
-            data=data, format='json'
-        )
+        data = {'target': x1.pk, 'alias': 'D2', 'cst_type': CstType.TERM}
+        response = self.execute(data, item=self.schema_id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['new_cst']['alias'], 'D2')
-        self.assertEqual(response.data['new_cst']['cst_type'], 'term')
+        self.assertEqual(response.data['new_cst']['cst_type'], CstType.TERM)
         d1.refresh_from_db()
-        cst1.refresh_from_db()
-        self.assertEqual(d1.order, 4)
+        x1.refresh_from_db()
         self.assertEqual(d1.term_resolved, '')
         self.assertEqual(d1.term_raw,  '@{D2|plur}')
-        self.assertEqual(cst1.order, 1)
-        self.assertEqual(cst1.alias, 'D2')
-        self.assertEqual(cst1.cst_type, CstType.TERM)
+        self.assertEqual(x1.order, 1)
+        self.assertEqual(x1.alias, 'D2')
+        self.assertEqual(x1.cst_type, CstType.TERM)
 
+    @decl_endpoint('/api/rsforms/{item}/cst-substitute', method='patch')
     def test_substitute_constituenta(self):
-        x1 = Constituenta.objects.create(
+        x1 = self.schema.insert_new(
             alias='X1',
-            schema=self.owned.item,
-            order=1,
             term_raw='Test1',
             term_resolved='Test1',
             term_forms=[{'text':'form1', 'tags':'sing,datv'}]
         )
-        x2 = Constituenta.objects.create(
+        x2 = self.schema.insert_new(
             alias='X2',
-            schema=self.owned.item,
-            order=2,
             term_raw='Test2'
         )
-        unowned = Constituenta.objects.create(
-            alias='X2',
-            schema=self.unowned.item,
-            order=1
-        )
+        unowned = self.unowned.insert_new('X2')
         
         data = {'original': x1.pk, 'substitution': unowned.pk, 'transfer_term': True}
-        response = self.client.patch(
-            f'/api/rsforms/{self.unowned.item.id}/cst-substitute',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
-
-        response = self.client.patch(
-            f'/api/rsforms/{self.owned.item.id}/cst-substitute',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertForbidden(data, item=self.unowned_id)
+        self.assertBadData(data, item=self.schema_id)
 
         data = {'original': unowned.pk, 'substitution': x1.pk, 'transfer_term': True}
-        response = self.client.patch(
-            f'/api/rsforms/{self.owned.item.id}/cst-substitute',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertBadData(data, item=self.schema_id)
 
         data = {'original': x1.pk, 'substitution': x1.pk, 'transfer_term': True}
-        response = self.client.patch(
-            f'/api/rsforms/{self.owned.item.id}/cst-substitute',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertBadData(data, item=self.schema_id)
 
-        d1 = Constituenta.objects.create(
+        d1 = self.schema.insert_new(
             alias='D1',
-            schema=self.owned.item,
-            order=3,
             term_raw='@{X2|sing,datv}',
             definition_formal='X1'
         )
         data = {'original': x1.pk, 'substitution': x2.pk, 'transfer_term': True}
-        response = self.client.patch(
-            f'/api/rsforms/{self.owned.item.id}/cst-substitute',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=self.schema_id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
 
         d1.refresh_from_db()
@@ -342,23 +283,20 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(d1.term_resolved, 'form1')
         self.assertEqual(d1.definition_formal, 'X2')
 
+    @decl_endpoint('/api/rsforms/{item}/cst-create', method='post')
     def test_create_constituenta_data(self):
         data = {
             'alias': 'X3',
-            'cst_type': 'basic',
+            'cst_type': CstType.BASE,
             'convention': '1',
             'term_raw': '2',
             'definition_formal': '3',
             'definition_raw': '4'
         }
-        item = self.owned.item
-        response = self.client.post(
-            f'/api/rsforms/{item.id}/cst-create',
-            data=data, format='json'
-        )
+        response = self.execute(data, item=self.schema_id)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertEqual(response.data['new_cst']['alias'], 'X3')
-        self.assertEqual(response.data['new_cst']['cst_type'], 'basic')
+        self.assertEqual(response.data['new_cst']['cst_type'], CstType.BASE)
         self.assertEqual(response.data['new_cst']['convention'], '1')
         self.assertEqual(response.data['new_cst']['term_raw'], '2')
         self.assertEqual(response.data['new_cst']['term_resolved'], '2')
@@ -366,79 +304,66 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(response.data['new_cst']['definition_raw'], '4')
         self.assertEqual(response.data['new_cst']['definition_resolved'], '4')
 
+    @decl_endpoint('/api/rsforms/{item}/cst-delete-multiple', method='patch')
     def test_delete_constituenta(self):
-        schema = self.owned
-        data = {'items': [1337]}
-        response = self.client.patch(
-            f'/api/rsforms/{schema.item.id}/cst-delete-multiple',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.set_params(item=self.schema_id)
+
+        data = {'items': [1337]}
+        self.assertBadData(data)
+
+        x1 = self.schema.insert_new('X1')
+        x2 = self.schema.insert_new('X2')
 
-        x1 = Constituenta.objects.create(schema=schema.item, alias='X1', cst_type='basic', order=1)
-        x2 = Constituenta.objects.create(schema=schema.item, alias='X2', cst_type='basic', order=2)
         data = {'items': [x1.id]}
-        response = self.client.patch(
-            f'/api/rsforms/{schema.item.id}/cst-delete-multiple',
-            data=data, format='json'
-        )
+        response = self.execute(data)
         x2.refresh_from_db()
-        schema.item.refresh_from_db()
+        self.schema.item.refresh_from_db()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(len(response.data['items']), 1)
-        self.assertEqual(schema.constituents().count(), 1)
+        self.assertEqual(self.schema.constituents().count(), 1)
         self.assertEqual(x2.alias, 'X2')
         self.assertEqual(x2.order, 1)
 
-        x3 = Constituenta.objects.create(schema=self.unowned.item, alias='X1', cst_type='basic', order=1)
+        x3 = self.unowned.insert_new('X1')
         data = {'items': [x3.id]}
-        response = self.client.patch(
-            f'/api/rsforms/{schema.item.id}/cst-delete-multiple',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertBadData(data, item=self.schema_id)
 
+    @decl_endpoint('/api/rsforms/{item}/cst-moveto', method='patch')
     def test_move_constituenta(self):
-        item = self.owned.item
-        data = {'items': [1337], 'move_to': 1}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-moveto',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.set_params(item=self.schema_id)
+
+        data = {'items': [1337], 'move_to': 1}
+        self.assertBadData(data)
+
+        x1 = self.schema.insert_new('X1')
+        x2 = self.schema.insert_new('X2')
 
-        x1 = Constituenta.objects.create(schema=item, alias='X1', cst_type='basic', order=1)
-        x2 = Constituenta.objects.create(schema=item, alias='X2', cst_type='basic', order=2)
         data = {'items': [x2.id], 'move_to': 1}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-moveto',
-            data=data, format='json'
-        )
+        response = self.execute(data)
         x1.refresh_from_db()
         x2.refresh_from_db()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(response.data['id'], item.id)
+        self.assertEqual(response.data['id'], self.schema_id)
         self.assertEqual(x1.order, 2)
         self.assertEqual(x2.order, 1)
 
-        x3 = Constituenta.objects.create(schema=self.unowned.item, alias='X1', cst_type='basic', order=1)
+        x3 = self.unowned.insert_new('X1')
         data = {'items': [x3.id], 'move_to': 1}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-moveto',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertBadData(data)
 
+    @decl_endpoint('/api/rsforms/{item}/reset-aliases', method='patch')
     def test_reset_aliases(self):
-        item = self.owned.item
-        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(response.data['id'], item.id)
+        self.set_params(item=self.schema_id)
 
-        x2 = Constituenta.objects.create(schema=item, alias='X2', cst_type='basic', order=1)
-        x1 = Constituenta.objects.create(schema=item, alias='X1', cst_type='basic', order=2)
-        d11 = Constituenta.objects.create(schema=item, alias='D11', cst_type='term', order=3)
-        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases')
+        response = self.execute()
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data['id'], self.schema_id)
+
+        x2 = self.schema.insert_new('X2')
+        x1 = self.schema.insert_new('X1')
+        d11 = self.schema.insert_new('D11')
+
+        response = self.execute()
         x1.refresh_from_db()
         x2.refresh_from_db()
         d11.refresh_from_db()
@@ -450,103 +375,57 @@ class TestRSFormViewset(APITestCase):
         self.assertEqual(d11.order, 3)
         self.assertEqual(d11.alias, 'D1')
 
-        response = self.client.patch(f'/api/rsforms/{item.id}/reset-aliases')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertOK()
 
+    @decl_endpoint('/api/rsforms/{item}/load-trs', method='patch')
     def test_load_trs(self):
-        schema = self.owned
-        schema.item.title = 'Test11'
-        schema.item.save()
-        x1 = Constituenta.objects.create(schema=schema.item, alias='X1', cst_type='basic', order=1)
+        self.set_params(item=self.schema_id)
+        self.schema.item.title = 'Test11'
+        self.schema.item.save()
+        x1 = self.schema.insert_new('X1')
         work_dir = os.path.dirname(os.path.abspath(__file__))
         with open(f'{work_dir}/data/sample-rsform.trs', 'rb') as file:
             data = {'file': file, 'load_metadata': False}
-            response = self.client.patch(
-                f'/api/rsforms/{schema.item.id}/load-trs',
-                data=data, format='multipart'
-            )
-        schema.item.refresh_from_db()
+            response = self.client.patch(self.endpoint, data=data, format='multipart')
+        self.schema.item.refresh_from_db()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(schema.item.title, 'Test11')
+        self.assertEqual(self.schema.item.title, 'Test11')
         self.assertEqual(len(response.data['items']), 25)
-        self.assertEqual(schema.constituents().count(), 25)
+        self.assertEqual(self.schema.constituents().count(), 25)
         self.assertFalse(Constituenta.objects.filter(pk=x1.id).exists())
 
-    def test_clone(self):
-        item = self.owned.item
-        item.title = 'Test11'
-        item.save()
-        x1 = Constituenta.objects.create(schema=item, alias='X12', cst_type='basic', order=1)
-        d1 = Constituenta.objects.create(schema=item, alias='D2', cst_type='term', order=1)
-        x1.term_raw = 'человек'
-        x1.term_resolved = 'человек'
-        d1.term_raw = '@{X12|plur}'
-        d1.term_resolved = 'люди'
-        x1.save()
-        d1.save()
-
-        data = {'title': 'Title'}
-        response = self.client.post(
-            f'/api/library/{item.id}/clone',
-            data=data, format='json'
-        )
-
-        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-        self.assertEqual(response.data['title'], 'Title')
-        self.assertEqual(response.data['items'][0]['alias'], x1.alias)
-        self.assertEqual(response.data['items'][0]['term_raw'], x1.term_raw)
-        self.assertEqual(response.data['items'][0]['term_resolved'], x1.term_resolved)
-        self.assertEqual(response.data['items'][1]['term_raw'], d1.term_raw)
-        self.assertEqual(response.data['items'][1]['term_resolved'], d1.term_resolved)
-
+    @decl_endpoint('/api/rsforms/{item}/cst-produce-structure', method='patch')
     def test_produce_structure(self):
-        item = self.owned.item
-        x1 = Constituenta.objects.create(schema=item, alias='X1', cst_type='basic', order=1)
-        s1 = Constituenta.objects.create(schema=item, alias='S1', cst_type='structure', order=2)
-        s2 = Constituenta.objects.create(schema=item, alias='S2', cst_type='structure', order=3)
-        s3 = Constituenta.objects.create(schema=item, alias='S3', cst_type='structure', order=4)
-        a1 = Constituenta.objects.create(schema=item, alias='A1', cst_type='axiom', order=5)
-        f1 = Constituenta.objects.create(schema=item, alias='F10', cst_type='function', order=6)
-        invalid_id = f1.id + 1
-        s1.definition_formal = 'ℬ(X1×X1)' # ℬ(X1×X1)
-        s2.definition_formal = 'invalid'
-        s3.definition_formal = 'X1×(X1×ℬℬ(X1))×ℬ(X1×X1)'
-        a1.definition_formal = '1=1'
-        f1.definition_formal = '[α∈X1, β∈X1] Fi1[{α,β}](S1)'
-        s1.save()
-        s2.save()
-        s3.save()
-        a1.save()
-        f1.save()
-
-        data = {'target': invalid_id}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-produce-structure',
-            data=data, format='json'
+        self.set_params(item=self.schema_id)
+        x1 = self.schema.insert_new('X1')
+        s1 = self.schema.insert_new(
+            alias='S1',
+            definition_formal='ℬ(X1×X1)'
         )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-
-        data = {'target': x1.id}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-produce-structure',
-            data=data, format='json'
+        s2 = self.schema.insert_new(
+            alias='S2',
+            definition_formal='invalid'
         )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-
-        data = {'target': s2.id}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-produce-structure',
-            data=data, format='json'
+        s3 = self.schema.insert_new(
+            alias='S3',
+            definition_formal='X1×(X1×ℬℬ(X1))×ℬ(X1×X1)'
         )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-
-        # Testing simple structure
-        s1.refresh_from_db()
-        data = {'target': s1.id}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-produce-structure',
-            data=data, format='json'
+        a1 = self.schema.insert_new(
+            alias='A1',
+            definition_formal='1=1'
         )
+        f1 = self.schema.insert_new(
+            alias='F10',
+            definition_formal='[α∈X1, β∈X1] Fi1[{α,β}](S1)'
+        )
+        invalid_id = f1.pk + 1337
+
+        self.assertBadData({'target': invalid_id})
+        self.assertBadData({'target': x1.id})
+        self.assertBadData({'target': s2.id})
+
+        # Testing simple structure        
+        response = self.execute({'target': s1.id})
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         result = response.data['schema']
         items = [item for item in result['items'] if item['id'] in response.data['cst_list']]
@@ -558,11 +437,7 @@ class TestRSFormViewset(APITestCase):
 
         # Testing complex structure
         s3.refresh_from_db()
-        data = {'target': s3.id}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-produce-structure',
-            data=data, format='json'
-        )
+        response = self.execute({'target': s3.id})
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         result = response.data['schema']
         items = [item for item in result['items'] if item['id'] in response.data['cst_list']]
@@ -572,11 +447,7 @@ class TestRSFormViewset(APITestCase):
 
         # Testing function
         f1.refresh_from_db()
-        data = {'target': f1.id}
-        response = self.client.patch(
-            f'/api/rsforms/{item.id}/cst-produce-structure',
-            data=data, format='json'
-        )
+        response = self.execute({'target': f1.id})
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         result = response.data['schema']
         items = [item for item in result['items'] if item['id'] in response.data['cst_list']]
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py b/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py
index 6c30ae1c..e1d39522 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_rslang.py
@@ -1,109 +1,41 @@
 ''' Testing views '''
-import os
-from rest_framework.test import APITestCase, APIRequestFactory, APIClient
 from rest_framework.exceptions import ErrorDetail
 from rest_framework import status
 
-from apps.users.models import User
-from apps.rsform.models import RSForm
-from apps.rsform.views import (
-    convert_to_ascii,
-    convert_to_math,
-    parse_expression
-)
+from .EndpointTester import decl_endpoint, EndpointTester
 
 
-class TestRSLanguageViews(APITestCase):
-    def setUp(self):
-        self.factory = APIRequestFactory()
-        self.user = User.objects.create(username='UserTest')
-        self.client = APIClient()
-        self.client.force_authenticate(user=self.user)
-
-    def test_create_rsform(self):
-        work_dir = os.path.dirname(os.path.abspath(__file__))
-        with open(f'{work_dir}/data/sample-rsform.trs', 'rb') as file:
-            data = {'file': file, 'title': 'Test123', 'comment': '123', 'alias': 'ks1'}
-            response = self.client.post(
-                '/api/rsforms/create-detailed',
-                data=data, format='multipart'
-            )
-        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-        self.assertEqual(response.data['owner'], self.user.pk)
-        self.assertEqual(response.data['title'], 'Test123')
-        self.assertEqual(response.data['alias'], 'ks1')
-        self.assertEqual(response.data['comment'], '123')
-
-    def test_create_rsform_fallback(self):
-        data = {'title': 'Test123', 'comment': '123', 'alias': 'ks1'}
-        response = self.client.post(
-            '/api/rsforms/create-detailed',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-        self.assertEqual(response.data['owner'], self.user.pk)
-        self.assertEqual(response.data['title'], 'Test123')
-        self.assertEqual(response.data['alias'], 'ks1')
-        self.assertEqual(response.data['comment'], '123')
-
+class TestRSLanguageViews(EndpointTester):
+    ''' Test RS language endpoints. '''
+    @decl_endpoint('/api/rslang/to-ascii', method='post')
     def test_convert_to_ascii(self):
+        data = {'data': '1=1'}
+        self.assertBadData(data)
+
         data = {'expression': '1=1'}
-        request = self.factory.post(
-            '/api/rslang/to-ascii',
-            data=data, format='json'
-        )
-        response = convert_to_ascii(request)
+        response = self.execute(data)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['result'], r'1 \eq 1')
 
-    def test_convert_to_ascii_missing_data(self):
-        data = {'data': '1=1'}
-        request = self.factory.post(
-            '/api/rslang/to-ascii',
-            data=data, format='json'
-        )
-        response = convert_to_ascii(request)
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-        self.assertIsInstance(response.data['expression'][0], ErrorDetail)
-
+    @decl_endpoint('/api/rslang/to-math', method='post')
     def test_convert_to_math(self):
+        data = {'data': r'1 \eq 1'}
+        self.assertBadData(data)
+
         data = {'expression': r'1 \eq 1'}
-        request = self.factory.post(
-            '/api/rslang/to-math',
-            data=data, format='json'
-        )
-        response = convert_to_math(request)
+        response = self.execute(data)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['result'], r'1=1')
 
-    def test_convert_to_math_missing_data(self):
-        data = {'data': r'1 \eq 1'}
-        request = self.factory.post(
-            '/api/rslang/to-math',
-            data=data, format='json'
-        )
-        response = convert_to_math(request)
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-        self.assertIsInstance(response.data['expression'][0], ErrorDetail)
-
+    @decl_endpoint('/api/rslang/parse-expression', method='post')
     def test_parse_expression(self):
+        data = {'data': r'1=1'}
+        self.assertBadData(data)
+
         data = {'expression': r'1=1'}
-        request = self.factory.post(
-            '/api/rslang/parse-expression',
-            data=data, format='json'
-        )
-        response = parse_expression(request)
+        response = self.execute(data)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['parseResult'], True)
         self.assertEqual(response.data['syntax'], 'math')
         self.assertEqual(response.data['astText'], '[=[1][1]]')
 
-    def test_parse_expression_missing_data(self):
-        data = {'data': r'1=1'}
-        request = self.factory.post(
-            '/api/rslang/parse-expression',
-            data=data, format='json'
-        )
-        response = parse_expression(request)
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-        self.assertIsInstance(response.data['expression'][0], ErrorDetail)
diff --git a/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py b/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py
index 594c95ad..68cbef23 100644
--- a/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py
+++ b/rsconcept/backend/apps/rsform/tests/s_views/t_versions.py
@@ -1,185 +1,141 @@
 ''' Testing API: Versions. '''
 import io
+from typing import cast
+from sys import version
 from zipfile import ZipFile
-from rest_framework.test import APITestCase, APIRequestFactory, APIClient
 from rest_framework import status
 
-from apps.users.models import User
 from apps.rsform.models import RSForm, Constituenta
 
+from .EndpointTester import decl_endpoint, EndpointTester
 
-class TestVersionViews(APITestCase):
+
+class TestVersionViews(EndpointTester):
     ''' Testing versioning endpoints. '''
     def setUp(self):
-        self.factory = APIRequestFactory()
-        self.user = User.objects.create(username='UserTest')
-        self.client = APIClient()
-        self.client.force_authenticate(user=self.user)
-        self.owned = RSForm.create(title='Test', alias='T1', owner=self.user)
-        self.unowned = RSForm.create(title='Test2', alias='T2')
+        super().setUp()
+        self.owned = RSForm.create(title='Test', alias='T1', owner=self.user).item
+        self.unowned = RSForm.create(title='Test2', alias='T2').item
         self.x1 = Constituenta.objects.create(
-            schema=self.owned.item,
+            schema=self.owned,
             alias='X1',
             cst_type='basic',
             convention='testStart',
             order=1
         )
 
+    @decl_endpoint('/api/rsforms/{schema}/versions/create', method='post')
     def test_create_version(self):
         invalid_data = {'description': 'test'}
-        data = {'version': '1.0.0', 'description': 'test'}
         invalid_id = 1338
-        response = self.client.post(
-            f'/api/rsforms/{invalid_id}/versions/create',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+        data = {'version': '1.0.0', 'description': 'test'}
 
-        response = self.client.post(
-            f'/api/rsforms/{self.unowned.item.id}/versions/create',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.assertNotFound(data, schema=invalid_id)
+        self.assertForbidden(data, schema=self.unowned.id)
+        self.assertBadData(invalid_data, schema=self.owned.id)
 
-        response = self.client.post(
-            f'/api/rsforms/{self.owned.item.id}/versions/create',
-            data=invalid_data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
-
-        response = self.client.post(
-            f'/api/rsforms/{self.owned.item.id}/versions/create',
-            data=data, format='json'
-        )
+        response = self.execute(data, schema=self.owned.id)
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         self.assertTrue('version' in response.data)
         self.assertTrue('schema' in response.data)
         self.assertTrue(response.data['version'] in [v['id'] for v in response.data['schema']['versions']])
-
-
+        
+    @decl_endpoint('/api/rsforms/{schema}/versions/{version}', method='get')
     def test_retrieve_version(self):
-        data = {'version': '1.0.0', 'description': 'test'}
-        response = self.client.post(
-            f'/api/rsforms/{self.owned.item.id}/versions/create',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-        version_id = response.data['version']
+        version_id = self._create_version({'version': '1.0.0', 'description': 'test'})
+        invalid_id = version_id + 1337
 
-        invalid_id = 1338
-        response = self.client.get(f'/api/rsforms/{invalid_id}/versions/{invalid_id}')
-        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
-        response = self.client.get(f'/api/rsforms/{self.owned.item.id}/versions/{invalid_id}')
-        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
-        response = self.client.get(f'/api/rsforms/{invalid_id}/versions/{version_id}')
-        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
-        response = self.client.get(f'/api/rsforms/{self.unowned.item.id}/versions/{version_id}')
-        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+        self.assertNotFound(schema=invalid_id, version=invalid_id)
+        self.assertNotFound(schema=self.owned.id, version=invalid_id)
+        self.assertNotFound(schema=invalid_id, version=version_id)
+        self.assertNotFound(schema=self.unowned.id, version=version_id)
 
-        self.owned.item.alias = 'NewName'
-        self.owned.item.save()
+        self.owned.alias = 'NewName'
+        self.owned.save()
         self.x1.alias = 'X33'
         self.x1.save()
         
-        response = self.client.get(f'/api/rsforms/{self.owned.item.id}/versions/{version_id}')
+        response = self.execute(schema=self.owned.id, version=version_id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertNotEqual(response.data['alias'], self.owned.item.alias)
+        self.assertNotEqual(response.data['alias'], self.owned.alias)
         self.assertNotEqual(response.data['items'][0]['alias'], self.x1.alias)
         self.assertEqual(response.data['version'], version_id)
 
+    @decl_endpoint('/api/versions/{version}', method='get')
     def test_access_version(self):
         data = {'version': '1.0.0', 'description': 'test'}
-        response = self.client.post(
-            f'/api/rsforms/{self.owned.item.id}/versions/create',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-        version_id = response.data['version']
+        version_id = self._create_version(data)
         invalid_id = version_id + 1337
 
-        response = self.client.get(f'/api/versions/{invalid_id}')
-        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+        self.assertNotFound(version=invalid_id)
 
-        self.client.logout()
-        response = self.client.get(f'/api/versions/{version_id}')
+        self.set_params(version=version_id)
+        self.logout()
+        response = self.execute()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data['version'], data['version'])
         self.assertEqual(response.data['description'], data['description'])
-        self.assertEqual(response.data['item'], self.owned.item.id)
+        self.assertEqual(response.data['item'], self.owned.id)
 
-        response = self.client.patch(
-            f'/api/versions/{version_id}',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        data = {'version': '1.2.0', 'description': 'test1'}
+        self.method = 'patch'
+        self.assertForbidden(data)
 
-        response = self.client.delete(f'/api/versions/{version_id}')
-        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+        self.method = 'delete'
+        self.assertForbidden()
 
         self.client.force_authenticate(user=self.user)
-
-        data = {'version': '1.1.0', 'description': 'test1'}
-        response = self.client.patch(
-            f'/api/versions/{version_id}',
-            data=data, format='json'
-        )
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
-
-        response = self.client.get(f'/api/versions/{version_id}')
-        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.method = 'patch'
+        self.assertOK(data)
+        response = self.get()
         self.assertEqual(response.data['version'], data['version'])
         self.assertEqual(response.data['description'], data['description'])
 
-        response = self.client.delete(f'/api/versions/{version_id}')
+        response = self.delete()
         self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
-
-        response = self.client.get(f'/api/versions/{version_id}')
+        response = self.get()
         self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
 
+    @decl_endpoint('/api/rsforms/{schema}/versions/{version}', method='get')
     def test_retrieve_version_details(self):
         a1 = Constituenta.objects.create(
-            schema=self.owned.item,
+            schema=self.owned,
             alias='A1',
             cst_type='axiom',
             definition_formal='X1=X1',
             order=2
         )
-
-        data = {'version': '1.0.0', 'description': 'test'}
-        response = self.client.post(
-            f'/api/rsforms/{self.owned.item.id}/versions/create',
-            data=data, format='json'
-        )
-        version_id = response.data['version']
-
+        version_id = self._create_version({'version': '1.0.0', 'description': 'test'})
         a1.definition_formal = 'X1=X2'
         a1.save()
 
-        response = self.client.get(f'/api/rsforms/{self.owned.item.id}/versions/{version_id}')
+        response = self.get(schema=self.owned.id, version=version_id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         loaded_a1 = response.data['items'][1]
         self.assertEqual(loaded_a1['definition_formal'], 'X1=X1')
         self.assertEqual(loaded_a1['parse']['status'], 'verified')
 
+    @decl_endpoint('/api/versions/{version}/export-file', method='get')
     def test_export_version(self):
         invalid_id = 1338
-        response = self.client.get(f'/api/versions/{invalid_id}/export-file')
-        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+        self.assertNotFound(version=invalid_id)
 
-        data = {'version': '1.0.0', 'description': 'test'}
-        response = self.client.post(
-            f'/api/rsforms/{self.owned.item.id}/versions/create',
-            data=data, format='json'
-        )
-        version_id = response.data['version']
-
-        response = self.client.get(f'/api/versions/{version_id}/export-file')
+        version_id = self._create_version({'version': '1.0.0', 'description': 'test'})
+        response = self.get(version=version_id)
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(
             response.headers['Content-Disposition'],
-            f'attachment; filename={self.owned.item.alias}.trs'
+            f'attachment; filename={self.owned.alias}.trs'
         )
         with io.BytesIO(response.content) as stream:
             with ZipFile(stream, 'r') as zipped_file:
                 self.assertIsNone(zipped_file.testzip())
                 self.assertIn('document.json', zipped_file.namelist())
+
+    def _create_version(self, data) -> int:
+        response = self.client.post(
+            f'/api/rsforms/{self.owned.id}/versions/create',
+            data=data, format='json'
+        )
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        return response.data['version'] # type: ignore
diff --git a/rsconcept/backend/apps/rsform/utils.py b/rsconcept/backend/apps/rsform/utils.py
index c4673cb8..893e8315 100644
--- a/rsconcept/backend/apps/rsform/utils.py
+++ b/rsconcept/backend/apps/rsform/utils.py
@@ -64,7 +64,7 @@ def write_zipped_json(json_data: dict, json_filename: str) -> bytes:
     return content.getvalue()
 
 def apply_pattern(text: str, mapping: dict[str, str], pattern: re.Pattern[str]) -> str:
-    ''' Apply mapping to matching in regular expression patter subgroup 1 '''
+    ''' Apply mapping to matching in regular expression pattern subgroup 1 '''
     if text == '' or pattern == '':
         return text
     pos_input: int = 0