Mutation Testing - Voxxed Days Cluj-Napoca 2017
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Mutation testing involves making small changes to code to test whether tests can detect the changes, like changing a + b to a - b. Running mutation testing on a Calculator class that returns the sum of inputs initially generated 1 test but did not kill any mutants. After adding a test with specific inputs, mutation testing was run again and generated 1 test that killed 1 mutant, achieving 100% coverage. The document discusses using mutation testing to improve test quality and ensure tests can detect small code changes or faults.
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Mutation Testing - Voxxed Days Cluj-Napoca 2017
- 13. $327.6 million
- 25. really?
- 33. return a + b;
- 34. return a + b;
- 36. public class Calculator { public int sum(int a, int b) { return a + b; } }
- 44. return a + b;
- 45. return a - b;
- 48. ●
- 49. ● ●
- 50. ● ● ●
- 51. ● ● ● ●
- 52. return a - b;
- 70. public class Calculator { public int sum(int a, int b) { return a + b; } } @Test public void force100PercentCoverage() { calculator.sum(0, 0); }
- 71. > MathMutator >> Generated 1 Killed 0 (0%) > KILLED 0 SURVIVED 1 > TIMED_OUT 0 NON_VIABLE 0 > MEMORY_ERROR 0 NOT_STARTED 0 > STARTED 0 RUN_ERROR 0 > NO_COVERAGE 0
- 72. @Test public void Should_ReturnSum_When_SummingTwoValues() { // given int a = 1; int b = 2; // when int result = calculator.sum(a, b); // then assertThat(result).isEqualTo(3); }
- 73. > MathMutator >> Generated 1 Killed 1 (100%) > KILLED 1 SURVIVED 0 > TIMED_OUT 0 NON_VIABLE 0 > MEMORY_ERROR 0 NOT_STARTED 0 > STARTED 0 RUN_ERROR 0 > NO_COVERAGE 0
- 76. ● ●
- 82. if (a >= 100) { throw new IllegalArgumentException(); } if (a < 100) { fooBar(); }
- 83. if (a >= 100) { throw new IllegalArgumentException(); } if (a < 100) { fooBar(); }
- 87. return a + b;
- 88. return a + b;
- 89. return a + b; return a - b return 0
- 90. return a + b; return a - b return 0
- 91. :)
- 100. // given
- 101. // given // when
- 102. // given // when
- 106. Jenkins
- 116. Thank you ł