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Golden files are indeed useful and broadly used in Go testing. There's a great presentation by Mitchell Hashimoto (of Hashicorp) for the uninitiated and I agree that it would be useful in Java as well. If it's not part of JUnit, perhaps it can find a place in JUnitPioneer as a community supported extension. cc: @nipafx |
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// converted this idea into a discussion Is Golden File Testing achievable via
... or perhaps something that I was exploring at: 🤔 Except for the |
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Yeah, as I said, I think is achievable in a lot of ways of implementation.😄 But one of the most important things in golden tests is the update feature. And anyway, if you want to add the update feature, a strong dependency raises. This is because you will have to modify your tests code in order to make them accept the results of the execution. And that's not good. I mean, you not always can write a golden file with the expected output by hand because maybe the program has a huge output. That's why the update feature is that important for golden file testing. Now imagine you have a huge program with a lot of tests, modifying one by one the ones that you want to accept the output result and then modifying it another time to make the comparative it's painful. And writing the expected output by hand test by test is more than painful jajaja. Doing so with a flag parameter when executing the tests, it's a lot more easy. That's why I see this highly coupled with the JUnit framework, and as a possible new feature for it.🚀 |
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Just found another instance of Golden File Testing within the JUnit 5's integration tests:
Let's wait and see what others think, including some @junit-team members. |
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There's https://approvaltests.com/ for it |
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Does something like this exist in for junit? https://api.flutter.dev/flutter/flutter_test/GoldenFileComparator-class.html |
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Would be nice to make JUnit able to support Golden File Testing.
Golden File Testing is an excellent approach for testing huge output files, API responses... It's useful when, apart from testing all the logic of your program (this is done by unit testing itself), furthermore you also want to know that what you are outputting and giving to a client, downstream, whatever... it's fine and contains what it should. Maybe in that impasse of writing the data into a file, something is not working properly.
I thought that maybe it can be done by adding an optional when calling to JUnit like --accept in order to write the result of the test to the golden file and, when that option isn't set, execute normal golden test behavior.
I thought also about different solutions like doing a library apart from JUnit and then use the approach inside unit tests. But there's always the dependency with JUnit due to the acceptance parameter when we want the test to write into the golden file. For example, if this done through an annotation in each TestCase class, every time you want to accept the output and write it to the golden files, you will have to change each TestClass... And that is a bit painful if you have a huge project with a lot of test cases.
Some links about Golden File Testing:
https://ro-che.info/articles/2017-12-04-golden-tests
https://medium.com/@jarifibrahim/golden-files-why-you-should-use-them-47087ec994bf
https://ieftimov.com/post/testing-in-go-golden-files/
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