“We don’t have time for tests.” After two years with an untested legacy codebase, I know that not having tests is far more expensive. Every production bug costs hours; a unit test costs 15 minutes.
JUnit 4 and Mockito¶
Annotations for readability. Mockito isolates dependencies — when/thenReturn for stubbing, verify for interaction checking. ArgumentCaptor for capturing parameters.
Rules for Good Tests¶
One assertion per test. Arrange–Act–Assert structure. Independent and repeatable. No dependency on execution order.
Test Coverage¶
Cobertura in Maven. Target: 70 percent for new projects, 40 percent for legacy. Test business logic and edge cases, not getters.
Jenkins Integration¶
Every commit = build + tests + Cobertura report. Track coverage trend over time. Failure = broken build.
In Conclusion¶
Tests are not a luxury. Start with critical business logic and expand gradually.
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