test: add tests for isElse function

[mykhailokurochkin]

• add tests for ifElse function

[mateacademy-ai-mentor]

Review Summary

You've made a great start on the tests for the ifElse function, and it's good that you're checking which callback is executed. However, the tests are currently incomplete and need a couple of additions to be more robust. Specifically, they are missing assertions to verify that the alternative callback is not called, and that all callbacks (condition, first, and second) are invoked with no arguments.

Please update your tests to include these checks. You can use expect(mock).not.toBeCalled() to ensure a function wasn't executed, and expect(mock).toBeCalledWith() to verify it was called with no arguments. These changes are necessary to fully meet the requirements.

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[mateacademy-ai-mentor]

This test is a good start, but it doesn't fully verify the behavior. According to the requirements, you should also check that:

1. The second callback is not executed when the condition is true.
2. Both the condition and first callbacks are executed with no arguments.

To do this, you could use mock functions for all callbacks and then use assertions like expect(mock).not.toBeCalled() and expect(mock).toBeCalledWith().

[mateacademy-ai-mentor]

Similar to the previous test, this one is incomplete. You need to verify two more things:

1. The first callback is not executed when the condition is false.
2. Both the condition and second callbacks are executed with no arguments.

You can use another mock function here as well to assert that it was not called, and check the arguments with toBeCalledWith().

[mateacademy-ai-mentor]

Review Summary

Excellent work on these tests! I am approving your solution as it successfully meets all the requirements. The test suite is comprehensive and correctly verifies all aspects of the ifElse function's behavior.

I have one small suggestion to make your tests even more robust. In a couple of test cases, ifElse is called with only two arguments. While these tests pass correctly, it's best practice to always call the function with its complete signature. You can simply provide a placeholder empty function, like () => {}, for the unused argument to ensure your tests are consistent and accurately reflect how the function should be used.

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[mateacademy-ai-mentor]

While this test passes correctly because the condition is true, the ifElse function is defined to accept three arguments. For consistency and to accurately represent the function's signature, it's best to provide all three arguments, even if one is just a placeholder empty function.

Consider changing this to ifElse(() => true, f, () => {});.