Refactored Database management to allow isolated integration tests

tests/fixtures/test_database.py

@@ -0,0 +1,56 @@
+import tempfile
+import os
+import shutil
+from pathlib import Path
+
+
+class TestDatabaseManager:
+  """Manager for temporary test databases"""
+  
+  @staticmethod
+  def create_temp_db_path():
+    """Create a unique temporary path for test database"""
+    temp_dir = tempfile.mkdtemp(prefix="test_mmt_")
+    return os.path.join(temp_dir, "test_tools.db")
+  
+  @staticmethod
+  def setup_test_environment(db_path):
+    """Configure environment to use test database"""
+    os.environ["DB_PATH"] = db_path
+    os.environ["ADMIN_EMAIL"] = "test.admin@test.com"
+    os.environ["ADMIN_PASSWORD"] = "TestAdmin123"
+    os.environ["SECRET_KEY"] = "test-secret-key-for-e2e-tests"
+  
+  @staticmethod
+  def inject_test_database(db_path):
+    """Inject test database instance into the application"""
+    # Import here to avoid circular imports
+    from src.core.user_database import Database, set_user_db
+    
+    # Create test database instance
+    test_db = Database(db_path)
+    
+    # Set it as the active instance
+    set_user_db(test_db)
+    
+    return test_db
+  
+  @staticmethod
+  def cleanup_test_db(db_path):
+    """Clean up temporary database"""
+    if os.path.exists(db_path):
+      # Clean up the complete temporary directory
+      temp_dir = os.path.dirname(db_path)
+      if os.path.exists(temp_dir):
+        shutil.rmtree(temp_dir, ignore_errors=True)
+  
+  @staticmethod
+  def restore_original_environment(original_env):
+    """Restore original environment"""
+    for key, value in original_env.items():
+      if value is None:
+        # Variable didn't exist before
+        if key in os.environ:
+          del os.environ[key]
+      else:
+        os.environ[key] = value