Test suite executed from CI pipeline (#433)

* Test strategy & test cases

* Unit tests

* Integration tests

tests/unit/test_text_completion/common/mock_helpers.py

@@ -0,0 +1,53 @@
+"""
+Common mocking utilities for text completion tests
+"""
+
+from unittest.mock import AsyncMock, MagicMock
+
+
+class CommonMocks:
+    """Common mock objects used across text completion tests"""
+    
+    @staticmethod
+    def create_mock_async_processor_init():
+        """Create mock for AsyncProcessor.__init__"""
+        mock = MagicMock()
+        mock.return_value = None
+        return mock
+    
+    @staticmethod
+    def create_mock_llm_service_init():
+        """Create mock for LlmService.__init__"""
+        mock = MagicMock()
+        mock.return_value = None
+        return mock
+    
+    @staticmethod
+    def create_mock_response(text="Test response", prompt_tokens=10, completion_tokens=5):
+        """Create a mock response object"""
+        response = MagicMock()
+        response.text = text
+        response.usage_metadata.prompt_token_count = prompt_tokens
+        response.usage_metadata.candidates_token_count = completion_tokens
+        return response
+    
+    @staticmethod
+    def create_basic_config():
+        """Create basic config with required fields"""
+        return {
+            'concurrency': 1,
+            'taskgroup': AsyncMock(),
+            'id': 'test-processor'
+        }
+
+
+class MockPatches:
+    """Common patch decorators for different services"""
+    
+    @staticmethod
+    def get_base_patches():
+        """Get patches that are common to all processors"""
+        return [
+            'trustgraph.base.async_processor.AsyncProcessor.__init__',
+            'trustgraph.base.llm_service.LlmService.__init__'
+        ]