Hi everyone slightly smiling face Was anybody able to use Po

Question

Hi everyone slightly smiling face Was anybody able to use PowerMock + Kotlin + plain junit4 + backticks for all methods For the first run everything was great but then nothing works again javassist sometimes logs strange errors about bytecode or methods merely can t be found by JUnit4TestRunnerXXX or Android Studio and even gradle task via console aren t able to find any tests even if some test should be failed I m interested in backticks usage It seems like transformation of such method to Java bytecode + bytecode manipulations of PowerMock break everything I know that there is `test` channel but I think it s can be more general problem When for instance I have more than 10 tests written with backticks then nothing works via gradle too with the following error ``` java lang IllegalStateException Failed to transform class with name com X X X SenderTest Reason source error is missing at org powermock core classloader MockClassLoader loadMockClass MockClassLoader java 284 at org powermock core classloader MockClassLoader loadModifiedClass MockClassLoader java 192 at org powermock core classloader DeferSupportingClassLoader loadClass1 DeferSupportingClassLoader java 77 at org powermock core classloader DeferSupportingClassLoader loadClass DeferSupportingClassLoader java 67 at java lang ClassLoader loadClass ClassLoader java 357 at java lang Class forName0 Native Method at java lang Class forName Class java 348 at org powermock modules junit4 common internal impl JUnit4TestSuiteChunkerImpl createDelegatorFromClassloader JUnit4TestSuiteChunkerImpl java 161 at org powermock modules junit4 common internal impl JUnit4TestSuiteChunkerImpl createDelegatorFromClassloader JUnit4TestSuiteChunkerImpl java 48 at org powermock tests utils impl AbstractTestSuiteChunkerImpl createTestDelegators AbstractTestSuiteChunkerImpl java 108 at org powermock modules junit4 common internal impl JUnit4TestSuiteChunkerImpl lt init gt JUnit4TestSuiteChunkerImpl java 71 Caused by compile error is missing at javassist compiler Parser parsePrimaryExpr Parser java 1250 at javassist compiler Parser parsePostfix Parser java 1031 at javassist compiler Parser parseCast Parser java 921 at javassist compiler Parser parseUnaryExpr Parser java 886 ```

gildor · Answer

hmmm looks like some problem of PowerMock

brainail · Answer

So it means that after Kotlin transformations with code like applying underscore instead of spaces PowerMock works with some invalid version of it

gildor · Answer

gt applying underscore instead of spaces Kotlin doesn t do that

brainail · Answer

Isn t it kotlin compiler thing

gildor · Answer

no

gildor · Answer

Kotlin do not use any JVM members name normalization

gildor · Answer

only names supported by JVM

gildor · Answer

for example space allowed to do by JVM but not by Java

gildor · Answer

You can easily check it if take a look on Kotlin bytecode but not Java code decompiled from bytecode

brainail · Answer

Oh I see now misunderstood that thing I didn t know that JVM allows it directly and just skip some prohibited characters

brainail · Answer

Anyway looks like for some reasons backticks in Kotlin test break everything Without them it works almost fine

gildor · Answer

For example Scala uses normalisation and allows to use characters not available for names on JVM but Kotlin doesn t

gildor · Answer

As I said maybe some bug of Power Mock

gildor · Answer

gt Failed to transform class with name

brainail · Answer

I gave up on it Wasted too much time Will try your suggestion with mockk

gildor · Answer

To be honest PowerMock has really bad reputation because of such problems and of course because of it s main feature

gildor · Answer

But of course cannot be sure maybe this crash of PM is just symptom of some other problem

brainail · Answer

Yes of course PowerMock it s a bad sign but there was legacy code which should be covered by tests without touching it

brainail · Answer

< gildor> only one tool is missed in API is that it s not possible to mock object creation like `whenNew` in PowerMock and it should be wrapped via some creation factory in each case Also I wonder does it use the same javasist under the hood or it s something better and not so risky slightly smiling face

gildor · Answer

Not sure about implementation details but author of mockk < oleksiyp> in this slack maybe he can answer

oleksiyp · Answer

Under the hood it is byte buddy for mockito mockk and power mock From point of view of stability it solely depends on mocking framework What cases are handled Mockk still strugling with spy and callOriginal things I am going to rethink things and reimplement it Main difference beetween frameworks is that I am focusing on Kotlin features and in mockito and powermock this is not first goal

brainail · Answer

< oleksiyp> So then it still means that the error above will be possible due to javasist from PowerMock if you rely on it right

oleksiyp · Answer

I thought PM migrated to byte buddy but seems it is not Try updating PM to latest if possble

brainail · Answer

Tried beta 2 0 dependencies still contain Javasist and byte buddy added yes but no luck