Add comprehensive test coverage for email service, password reset endpoints, and soft delete functionality

- Introduced unit tests for `EmailService` covering `ConsoleEmailBackend` and `SMTPEmailBackend`.
- Added tests for password reset request and confirmation endpoints, including edge cases and error handling.
- Implemented soft delete CRUD tests to validate `deleted_at` behavior and data exclusion in queries.
- Enhanced API tests for email functionality and user management workflows.

backend/tests/conftest.py

@@ -3,8 +3,12 @@ import uuid
 from datetime import datetime, timezone
 
 import pytest
+from fastapi.testclient import TestClient
 
+from app.main import app
+from app.core.database import get_db
 from app.models.user import User
+from app.core.auth import get_password_hash
 from app.utils.test_utils import setup_test_db, teardown_test_db, setup_async_test_db, teardown_async_test_db
 
 
@@ -63,4 +67,90 @@ def mock_user(db_session):
     )
     db_session.add(mock_user)
     db_session.commit()
-    return mock_user
+    return mock_user
+
+
+@pytest.fixture(scope="function")
+def test_db():
+    """
+    Creates a test database for integration tests.
+
+    This creates a fresh database for each test to ensure isolation.
+    """
+    test_engine, TestingSessionLocal = setup_test_db()
+
+    # Create a session
+    with TestingSessionLocal() as session:
+        yield session
+
+    # Clean up
+    teardown_test_db(test_engine)
+
+
+@pytest.fixture(scope="function")
+def client(test_db):
+    """
+    Create a FastAPI test client with a test database.
+
+    This overrides the get_db dependency to use the test database.
+    """
+    def override_get_db():
+        try:
+            yield test_db
+        finally:
+            pass
+
+    app.dependency_overrides[get_db] = override_get_db
+
+    with TestClient(app) as test_client:
+        yield test_client
+
+    app.dependency_overrides.clear()
+
+
+@pytest.fixture
+def test_user(test_db):
+    """
+    Create a test user in the database.
+
+    Password: TestPassword123
+    """
+    user = User(
+        id=uuid.uuid4(),
+        email="testuser@example.com",
+        password_hash=get_password_hash("TestPassword123"),
+        first_name="Test",
+        last_name="User",
+        phone_number="+1234567890",
+        is_active=True,
+        is_superuser=False,
+        preferences=None,
+    )
+    test_db.add(user)
+    test_db.commit()
+    test_db.refresh(user)
+    return user
+
+
+@pytest.fixture
+def test_superuser(test_db):
+    """
+    Create a test superuser in the database.
+
+    Password: SuperPassword123
+    """
+    user = User(
+        id=uuid.uuid4(),
+        email="superuser@example.com",
+        password_hash=get_password_hash("SuperPassword123"),
+        first_name="Super",
+        last_name="User",
+        phone_number="+9876543210",
+        is_active=True,
+        is_superuser=True,
+        preferences=None,
+    )
+    test_db.add(user)
+    test_db.commit()
+    test_db.refresh(user)
+    return user