Test-driven devevelopment practice study using java spring boot

As the project name describes, this project is created using Java-based Spring boot for Test-driven Development practice study and for FUN. Project development is separated into 2 types, one is MVC with Thymeleaf as template engine, and the other one is REST-API.

Testing Overview

Unit testing

• Testing an individual unit of code for correctness
• Provide fixed inputs
• Expect predictable output

Unit testing Pros

1. Early detection of errors: Unit tests can help developers identify and fix bugs early in the development process, before they make their way into the final product.
2. Improved code quality: By breaking code down into smaller, testable units, developers can ensure that each component is working as intended and that the overall codebase is more robust.
3. Easier maintenance: Unit tests provide a safety net for future changes, making it easier to refactor and update code without introducing new bugs.

Unit testing Cons

1. Additional development time: Writing unit tests can add to the development time, which may not be feasible for all projects or teams.
2. Limited scope: Unit tests only test small, individual components of the code and may not catch integration or system-level issues.
3. False sense of security: If unit tests are not written or maintained properly, they may give developers a false sense of security that the code is working correctly when it is not.
4. Test maintenance: As the codebase changes, the unit test must be updated as well, this can be a time-consuming task and must be taken into account.

Integration testing

• Test multiple components together as part of a test plan
• Determine if software units work together as expected
• Identify any negative side effects due to integration
• Can test using mocks / stubs
• Can also test using live integrations (database, file system)

Unit Testing Frameworks

• Junit
  • Supports creating test cases
  • Automation of the test cases with pass / fail
  • Utilities for test setup, teardown and assertions, etc..
• Mockito
  • Create mocks and stubs
  • Minimize dependencies on external components, etc...

Prerequisites

• Java 17
• Springboot 2x
• Maven 3x