test: add integration and unit tests for ContentType.variants() branch support

- Added integration tests (41e, 41f) in test_entry.py for branch as keyword
  arg and branch combined with query params on content_type.variants().find()
- Moved fetch-raises-without-entry-uid assertion to test_variants.py as a
  unit test (mocked, no network) where it logically belongs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: OMpawar-21

tests/test_entry.py

@@ -347,6 +347,20 @@ def test_41d_content_type_variants_multiple_uids_find_with_branch(self):
         result = content_type.variants([VARIANT_UID], BRANCH).find()
         self.assertIn('variants', result['entries'][0]['publish_details'])
 
+    @unittest.skipIf(BRANCH is None, "config.BRANCH is required for branch variant tests")
+    def test_41e_content_type_variants_branch_as_keyword_arg(self):
+        """Test content_type.variants() with branch passed as keyword argument"""
+        content_type = self.stack.content_type('faq')
+        result = content_type.variants(VARIANT_UID, branch=BRANCH).find()
+        self.assertIn('variants', result['entries'][0]['publish_details'])
+
+    @unittest.skipIf(BRANCH is None, "config.BRANCH is required for branch variant tests")
+    def test_41f_content_type_variants_branch_with_params(self):
+        """Test content_type.variants() with branch and extra query params"""
+        content_type = self.stack.content_type('faq')
+        result = content_type.variants(VARIANT_UID, branch=BRANCH, params={'locale': 'en-us'}).find()
+        self.assertIn('variants', result['entries'][0]['publish_details'])
+
     def test_42_entry_environment_removal(self):
         """Test entry remove_environment method"""
         entry = (self.stack.content_type('faq')

tests/test_variants.py

@@ -188,3 +188,12 @@ def test_variants_backward_compatible_params_kwarg(self, mock_http_instance):
         result = entry.variants("variant_uid", params={"locale": "en-us"})
         assert result.branch is None
         assert result.entry_param == {"locale": "en-us"}
+
+    def test_content_type_variants_fetch_raises_without_entry_uid(self, mock_http_instance):
+        from contentstack.contenttype import ContentType
+        import pytest
+
+        content_type = ContentType(mock_http_instance, "faq")
+        variants = content_type.variants("variant_uid")
+        with pytest.raises(ValueError):
+            variants.fetch()