What testing frameworks are commonly used in Java full stack development (JUnit, Mockito, Selenium, etc.)?

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In Java full stack development, testing is essential for ensuring both frontend and backend components function correctly. Developers use a combination of unit testing, integration testing, and UI testing frameworks. Commonly used tools include:

1. JUnit (Unit Testing)

  • Most widely used framework for testing Java code.

  • Supports annotations like @Test, @BeforeEach, and @AfterEach to define test methods and setup/teardown logic.

  • Used to test individual classes or methods in isolation.

2. Mockito (Mocking)

  • Used for creating mock objects in unit tests.

  • Allows testing components in isolation by simulating dependencies like databases or services.

  • Often used with JUnit for service-layer testing.

3. Selenium (UI Testing)

  • Automates browser actions to test frontend behavior.

  • Supports multiple browsers and integrates well with Java using Selenium WebDriver.

  • Often paired with TestNG or JUnit for full browser-based test suites.

4. Spring Test (Integration Testing)

  • Part of the Spring Framework, used for testing Spring-based applications.

  • Enables testing of controllers, services, and repositories with mock beans or actual contexts.

5. TestNG

  • Similar to JUnit but with more powerful configuration options.

  • Supports parallel test execution and detailed test reports.

6. AssertJ / Hamcrest

  • Provides fluent assertions for more readable test code.

Together, these frameworks cover the full testing spectrum—from backend logic and APIs to frontend UI and integration—ensuring reliability and quality in Java full stack applications.

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