To implement a sorting algorithm using Test-Driven Development (TDD), you should follow these steps: Write a failing test: Begin by writing a test that specifies the expected behavior. For example, inputting [3, 1, 2] should return [1, 2, 3]. Make it pass: Implement the minimal code necessary to make the test pass. Initially, this could be hardcoded. Refactor: Improve the implementation while keeping all tests green. Repeat: Add more test cases (e.g., empty arrays, already sorted arrays, duplicates, large arrays) and continue the cycle.