Jest Utility Test Skill

Whenever Copilot encounters a utility or helper function (e.g., string manipulation, math operations, data formatting), it should generate a corresponding Jest test file.

• •Place the test file alongside the utility in the same folder, named <filename>.test.js.
• •Ensure tests cover normal cases, edge cases, and error handling.
• •Use describe blocks for grouping and test blocks for individual cases.
• •Keep tests concise, readable, and aligned with Jest best practices.
• •If the function throws errors, include toThrow assertions.
• •If the function handles arrays or objects, include tests for empty and malformed inputs.
• •Include atleast one edge case.
• •For number inputs, test with value -1, 0, undefined. Update function if these edge cases are not handled.