Test suite executed from CI pipeline (#433)

* Test strategy & test cases

* Unit tests

* Integration tests

check_imports.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""
+Check if TrustGraph imports work correctly for testing
+"""
+
+import sys
+import traceback
+
+def check_import(module_name, description):
+    """Try to import a module and report the result"""
+    try:
+        __import__(module_name)
+        print(f"✅ {description}: {module_name}")
+        return True
+    except ImportError as e:
+        print(f"❌ {description}: {module_name}")
+        print(f"   Error: {e}")
+        return False
+    except Exception as e:
+        print(f"❌ {description}: {module_name}")
+        print(f"   Unexpected error: {e}")
+        return False
+
+def main():
+    print("Checking TrustGraph imports for testing...")
+    print("=" * 50)
+    
+    imports_to_check = [
+        ("trustgraph", "Base trustgraph package"),
+        ("trustgraph.base", "Base classes"),
+        ("trustgraph.base.llm_service", "LLM service base class"),
+        ("trustgraph.schema", "Schema definitions"),
+        ("trustgraph.exceptions", "Exception classes"),
+        ("trustgraph.model", "Model package"),
+        ("trustgraph.model.text_completion", "Text completion package"),
+        ("trustgraph.model.text_completion.vertexai", "VertexAI package"),
+    ]
+    
+    success_count = 0
+    total_count = len(imports_to_check)
+    
+    for module_name, description in imports_to_check:
+        if check_import(module_name, description):
+            success_count += 1
+        print()
+    
+    print("=" * 50)
+    print(f"Import Check Results: {success_count}/{total_count} successful")
+    
+    if success_count == total_count:
+        print("✅ All imports successful! Tests should work.")
+    else:
+        print("❌ Some imports failed. Please install missing packages.")
+        print("\nTo fix, run:")
+        print("  ./install_packages.sh")
+        print("or install packages manually:")
+        print("  cd trustgraph-base && pip install -e . && cd ..")
+        print("  cd trustgraph-vertexai && pip install -e . && cd ..")
+        print("  cd trustgraph-flow && pip install -e . && cd ..")
+    
+    # Test the specific import used in the test
+    print("\n" + "=" * 50)
+    print("Testing specific import from test file...")
+    try:
+        from trustgraph.model.text_completion.vertexai.llm import Processor
+        from trustgraph.schema import TextCompletionRequest, TextCompletionResponse, Error
+        from trustgraph.base import LlmResult
+        print("✅ Test imports successful!")
+    except Exception as e:
+        print(f"❌ Test imports failed: {e}")
+        traceback.print_exc()
+
+if __name__ == "__main__":
+    main()