How to Properly Mock Functions in Jest: A Guide for Node.js and React Developers

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Troubleshooting Jest Mock Functions: Ensuring Your Tests Run Smoothly

The Problem: Mock Functions Not Being Called

Here's a brief overview of the affected code structure:

[[See Video to Reveal this Text or Code Snippet]]

Both of these functions were abstracted into a helper module, and the goal was to replace their implementations during testing.

The Solution: Using Jest Mocks Effectively

Step 1: Import Your Helper Functions

Make sure to import your helper functions correctly in your test file. This keeps your test isolated and allows Jest to mock them as intended.

[[See Video to Reveal this Text or Code Snippet]]

Here’s an example of how to do it:

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Step 3: Run Your Tests

You can now run your tests as usual. The mocked functions will return the resolved values you've set up, allowing you to verify the behavior of your main function without hitting the actual SDK.

Here’s a snippet of what your test might look like:

[[See Video to Reveal this Text or Code Snippet]]

Key Takeaways

Check Function Imports: Ensure that your functions are properly imported to be mocked.

Console Logs for Debugging: Adding console logs can help verify whether your mocks are called correctly during the tests.

By following the steps outlined above, you should be able to successfully mock your functions in Jest, leading to more reliable and efficient tests without unnecessary external calls. Happy testing!