Unable to mock static methods using Mockito for instrumentation tests in Android

Question

I am using Mockito framework for mocking objects for writing instrumentation tests. But I am not able to mock static methods using Mockito. I know this is not possible using Mockito alone and the recommended solution is to use PowerMock on top of Mockito. But when I use PowerMock, it throws the following exception.

java.lang.IllegalStateException: Extension API internal error: org.powermock.api.extension.proxyframework.ProxyFrameworkImpl could not be located in classpath.

Searching for this exception shows that it is because PowerMock produces .class files but for running instrumentation tests we need to have .dex file. Therefore the solution was to add dexmaker library. Therefore I added the dexmaker library.

androidTestCompile 'com.google.dexmaker:dexmaker:1.2'
androidTestCompile 'com.google.dexmaker:dexmaker-mockito:1.2'

But after adding that library, I am getting the below exception at compile time.

    Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebugAndroidTest'.
> com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK mockito-extensions/org.mockito.plugins.MockMaker
    File1: C:\Users\anshul.jain\.gradle\caches\modules-2\files-2.1\org.powermock\powermock-api-mockito\1.6.4\fe12509b7e9e49d25131f4155145748a31e42e40\powermock-api-mockito-1.6.4.jar
    File2: C:\Users\anshul.jain\.gradle\caches\modules-2\files-2.1\com.google.dexmaker\dexmaker-mockito\1.2\b99884a4c6ef6335ba376f79aa79632b2421c17c\dexmaker-mockito-1.2.jar

I am not able to mock static methods using Mockito. Any solution for this?

in Android Studio configuration, I have given AndroidJunitRunner, but for individual tests where I am using PowerMock I am using @RunWith(PowerMockRunner.class). I tried using MockitoJunitRunner.class, but still the test case failed with message "Test framework quit unexpectedly" — thedarkpassenger, May 10 '16 at 08:19
Well, the problem is that the libraries use the same class (PowerMock and the dexmaker-mockito). You would need to exclude the class (or maybe the whole package) from one of the libs. — Kelevandos, May 10 '16 at 08:23
Wait. In the first solution, did you add the Annotation for the classes you were power-mocking? — Kelevandos, May 10 '16 at 08:25
Yes, I am adding @Runwith(PowerMockRunner.class) for the classes where I am using PowerMock. — thedarkpassenger, May 10 '16 at 08:26
I mean the @PrepareForTest(YourStaticClass.class) annotation. Add it below the TestRunner annotation and try the first solution again — Kelevandos, May 10 '16 at 08:27
Yes, PrepareForTest is already below the TestRunner annotation. — thedarkpassenger, May 10 '16 at 08:28
Please try my answer here: https://stackoverflow.com/a/64057104/6238538 Hope it helps :) — Wang Peiming, Sep 25 '20 at 03:04

Unable to mock static methods using Mockito for instrumentation tests in Android

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