Generating tests worth keeping
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
keep valuable tests and discard the rest.
Planned topics
- Ask for edge cases, error paths, boundaries, and a regression test for a known bug.
- Tests that mirror the implementation line by line add no protection.
- A generated test that asserts a current bug cements it; check the expected value against the requirement.
- Use mutation testing (verify the tool and version, such as PIT, before recording) to see if new tests catch changes.
- Delete flaky or redundant tests.
Draft outline details
Demonstration
a mutation report where generated tests kill 40% of mutants and a better edge-case test adds more.
Check your understanding
What does a surviving mutant tell you?
Show answer
No test noticed that changed behavior.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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