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Are you testing your unit tests?
- 1. ARE YOU TESTING YOUR UNIT TESTS?
- 2. #DevoxxUK | #MutationTest @iamsoham 2 SOHAM DASGUPTA Father and Football lover Tech Enthusiast/Programmer/Architect Speaker & Blogger Twitter : @iamsoham LinkedIn: dasguptasoham Github: sohamda Medium: @iam.soham
- 3. #DevoxxUK | #MutationTest @iamsoham 3 QUICK TOUR OF Code coverage with Unit Tests Are you checking everything? Mutations & Coverage Tips & Trick
- 4. #DevoxxUK | #MutationTest @iamsoham 4 CODE COVERAGE Code coverage, also called test coverage, is a measure of how much of the application's code has been executed in testing
- 5. #DevoxxUK | #MutationTest @iamsoham 5 ARE YOU CHECKING EVERYTHING!
- 6. #DevoxxUK | #MutationTest @iamsoham 6 ARE YOU CHECKING EVERYTHING!
- 7. #DevoxxUK | #MutationTest @iamsoham 7 COVERAGE?
- 8. #DevoxxUK | #MutationTest @iamsoham 8 MUTATION TESTS • Faults (or mutations) are automatically seeded into your code, then your tests are run. If your tests fail then the mutation is killed, if your tests pass then the mutation lived. • Coverage? percentage of mutations killed Mutations Survived Killed Also known as Pitests
- 9. #DevoxxUK | #MutationTest @iamsoham 9 COVERAGE?
- 10. #DevoxxUK | #MutationTest @iamsoham 10 MUTATIONS? Also known as Pitests • Modifies your application code and runs the unit tests. • It should produce different results and cause the unit tests to fail. • If a unit test does not fail in this situation, it may indicate an issue with the test suite.
- 11. #DevoxxUK | #MutationTest @iamsoham 11
- 12. #DevoxxUK | #MutationTest @iamsoham 12
- 13. #DevoxxUK | #MutationTest @iamsoham 13 MUTATORS? Conditionals Boundary Increments Invert Negatives Math Negate Conditionals Return Values Void Method Calls Empty returns False Returns True returns Null returns • PIT has built-in mutators, of which most are activated by default. • Mutations are performed on the byte code generated by the compiler rather than on the source files. Primitive returns Remove Conditionals Experimental Switch Inline Constant Constructor Calls Non Void Method Calls Remove Increments Experimental Argument Propagation Experimental Big Integer Experimental Member Variable Experimental Naked Receiver
- 14. #DevoxxUK | #MutationTest @iamsoham 14 HOW TO USE IT Intellij plugin
- 15. #DevoxxUK | #MutationTest @iamsoham 15 HOW TO USE THIS Maven/Gradle
- 16. #DevoxxUK | #MutationTest @iamsoham 16 HOW TO USE THIS Tips & Tricks - Maven
- 17. #DevoxxUK | #MutationTest @iamsoham 17 HOW TO USE THIS Tips & Tricks - mvn pitest:mutationCoverage
- 18. #DevoxxUK | #MutationTest @iamsoham 18 HOW TO USE THIS Tips & Tricks - mvn pitest:mutationCoverage
- 19. #DevoxxUK | #MutationTest @iamsoham 19 HOW TO USE THIS Tips & Tricks - mvn pitest:mutationCoverage
- 20. This presentation contains information that may be privileged or confidential and is the property of the Capgemini Group. Copyright © 2022 Capgemini. All rights reserved. About Capgemini Capgemini is a global leader in partnering with companies to transform and manage their business by harnessing the power of technology. The Group is guided everyday by its purpose of unleashing human energy through technology for an inclusive and sustainable future. It is a responsible and diverse organization of over 325,000 team members more than 50 countries. With its strong 55-year heritage and deep industry expertise, Capgemini is trusted by its clients to address the entire breadth of their business needs, from strategy and design to operations, fueled by the fast evolving and innovative world of cloud, data, AI, connectivity, software, digital engineering and platforms. The Group reported in 2021 global revenues of €18 billion. Get The Future You Want | www.capgemini.com
Editor's Notes
- Traditional test coverage (i.e line, statement, branch, etc.) measures only which code is executed by your tests. It does not check that your tests are actually able to detect faults in the executed code. It is therefore only able to identify code that is definitely not tested.
- The default set can be overridden, and different operators selected, by passing the names of the required operators to the mutators parameter. To make configuration easier, some mutators are put together in groups. Passing the name of a group in the mutators parameter will activate all mutators of the group. . This approach has the advantage of being generally much faster and easier to incorporate into a build, but it can sometimes be difficult to simply describe how the mutation operators map to equivalent changes to a Java source file.