x:rep/small - Add test for remaining-time function

[b-rajkumar]

This pull request introduces a new test case for the remaining_time function.
This additional test complements the existing one and verifies the function's logic operates as intended, not just a fixed subtraction or hardcoding.

You can refer to the bellow image to see how the faulty implementation is making all the test cases pass

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

For more information, refer to the documentation. If you are unsure whether to add the message or not, please ping @exercism/maintainers-admin in a comment. Thank you!

[github-actions]

Hello. Thanks for opening a PR on Exercism 🙂

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