What is the method of creating unit tests for a function that involves numerous REST API calls for paginated responses?

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When creating unit tests for a function that involves numerous REST API calls for paginated responses, follow the steps below:

1. Breaking down the function: First, break down the function into several smaller functions. Each small function should only be responsible for a single task.

2. Mocking the API calls: To avoid hitting the live API, mock the API calls using a library like Jest or Sinon.js. This can help to speed up the tests and prevent the tests from interfering with the live API.

3. Paginating the responses: To handle paginated responses, mock the response data for each page of results for the API call. Make sure to include all possible scenarios such as:

• First page has no results
• Middle pages have results
• Last page has results
• All pages have results

1. Testing each function: Test each smaller function individually. Mock the API response data for each test case.

2. Testing the main function: Finally, test the main function by passing in mock API responses to ensure that it performs as expected. Include all possible scenarios when testing for the main function, such as a successful response, a failed response, and handling of errors.

By breaking down the function into smaller units and mocking the API calls, you can ensure that each function performs as expected and handles paginated responses correctly.