Kotlin Power Assert
My regular viewer will know that I’m a test-driven fanatic. I love to find new ways to make tests more expressive and economic, so I was excited when I saw that there was a lightning talk at KotlinConf on Kotlin Power-assert (https://kotlinlang.org/docs/power-ass....
Power-assert is a compiler plugin that enhances the regular Kotlin assert function. It promises to help us understand why a test failed without needing complex assertion libraries. As a developer with a bit of a complex assertion library habit, this is intriguing, so please join me as I convert some tests from plain old JUnit and the Strikt assertion library to see if Power-Assert is testing methadone.
In this episode
00:00:56 Looking at ListStockTests
00:01:52 We should use Kotlin.test.assertEquals not Junit
00:03:05 What does an assertion failure look like?
00:03:58 Why do we have so many assertions?
00:06:10 What if every assertion was just assertTrue?
00:06:52 Enter Power-assert
00:08:06 assert now has super powers
00:12:08 Power-assert sees the whoe boolean expression argument to assert
00:13:15 Comparing Power-assert and Strikt
00:21:30 Soft assertions in Power-assert
00:24:50 Combining Power-assert and JUnit assertAll
I get lots of questions about the test progress bar. It was written by the inimitable @dmitrykandalov. To use it install his Liveplugin (https://plugins.jetbrains.com/plugin/...) and then this gist https://gist.github.com/dmcg/1f56ac39...
This video is one of lots on testing ( • Testing ) and the code is from my Test Driven Gilded Rose project ( • Test Driven Gilded Rose in Kotlin ) available on GitHub (https://github.com/dmcg/gilded-rose-tdd).
If you like this video, you’ll probably like my book Java to Kotlin, A Refactoring Guidebook (http://java-to-kotlin.dev). It's about far more than just the syntax differences between the languages - it shows how to upgrade your thinking to a more functional style.
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