Mutation Testing with Mutant
summary
Mutation testing using Mutant runs your existing RSpec specs against many tiny code changes and reports which mutations survive; an example run produces 82 of 83 mutants killed, leaving one surviving mutant. The demo adds SimpleCov to show 100% line coverage yet still finds the surviving mutation, then writes a targeted spec (zero tolerance / edge-of-range case) and re-runs Mutant to kill the last mutant and make the test suite truly stricter.
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chapters (11)
- 0:00Start
- 1:45Editor
- 3:29Interactive Debugger
- 4:58Testing
- 6:42Code Coverage
- 8:07Mutation Testing
- 8:20Mutation Testing Is a Tool
- 11:42Types of Mutations
- 13:08Live Coding
- 31:00Mutant Command Line
- 34:09Mutation Output
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