Trustigo.tech employs JUnit, a unit testing framework for the Java programming language that plays a crucial role in test‑driven development. JUnit allows developers to incrementally build test suites to measure progress and detect unintended side effects. Tests can be run continuously. TestNG is a testing framework inspired by JUnit and NUnit, but introduces new functionalities that make it more powerful and easier to use. Using TestNG, we can generate proper reports and easily see how many test cases are passed, failed, and skipped. Mocking is a way to test the functionality of a class in isolation without requiring a database connection, properties file read, or file server read. Mock objects simulate real services. Trustigo.tech uses Mockito to mock interfaces so that dummy functionality can be added to a mock interface for use in unit testing. These practices ensure high‑quality, reliable software delivery.