Write automated tests: Android Basics with Compose - NoClassDefFoundError

[AlperenImam0glu]

TipCalculatorTests, the unit test class we created by following the “Write automated tests” codelab, gives an error when run. The TipUITests class created for Ui testing runs smoothly. At first I thought there was a problem in my own steps, but there is the same error in the test_solution branch. I couldn't find a solution to this problem.

Error message:

java.lang.NoClassDefFoundError: com/example/tiptime/MainActivityKt

Repository
https://github.com/google-developer-training/basic-android-kotlin-compose-training-tip-calculator/tree/test_solution

[AJThePro99]

Yes! I've been getting this error as well. ( I actually created the test not under test/java at first )
I am on windows (Notorious for backslashes), and I went in to create directory test/java but the pre-determined option was not there (Spoiler: It was test\java) So, I went with the closest looking one: androidTest/java

And, I wrote the unit test as it is in the same, and it worked flawlessly. But, when I went to the next section of the codelab, turns out I messed up. So, I started from scratch and properly followed the codelab, only to run into NoClassDefFoundError