How can I use mock objects in Flask testing?

How can I use mock objects in Flask testing?

You can use the unittest.mock library to create mock objects for your Flask tests. This allows you to simulate external dependencies.

Can you give me an example of how to mock a database call?

Sure! You can use patch to replace the database call with a mock. For example:

from unittest.mock import patch

@patch('yourapp.models.db.session')
def test_your_function(mock_session):
    mock_session.query.return_value = [MockUser()]
    # Your test code here

This way, you can control the return value of the database call.

What are some common pitfalls when using mocks?

Common pitfalls include over-mocking, which can lead to tests that don't reflect real behavior, and not resetting mocks between tests.

How do I ensure my tests are still valid with mocks?

It's important to test the integration with real objects as well. Use mocks primarily for unit tests and ensure you have integration tests that use real dependencies.