Mockito + Dexmaker on Android
So the problem is with Dexmaker not being able to find the cache path on Android >= 4.3 as other people mentioned and as described in this dexmaker issue.
I went with implementing the workaround in a custom instrumented test runner instead of in every test (or their superclass) setUp()
, because it feels a bit less hacky (it really is in only one place - and not inherited in every subclass) and more flexible.
For the sake of documentation these are the necessary changes to do this:
public class CustomInstrumentationTestRunner extends InstrumentationTestRunner {
@Override public void onCreate (final Bundle arguments) {
super.onCreate(arguments);
// temporary workaround for an incompatibility in current dexmaker (1.1) implementation and Android >= 4.3
// cf. https://code.google.com/p/dexmaker/issues/detail?id=2 for details
System.setProperty("dexmaker.dexcache", getTargetContext().getCacheDir().toString());
}
}
And set up your project (or test project) to use this class as the instrumented test runner in its AndroidManifest.xml
when building with ant:
<instrumentation
android:name="my.package.CustomInstrumentationTestRunner"
android:targetPackage="my.target.package" />
or its build.gradle
when building with gradle:
android {
defaultConfig {
// ...
testInstrumentationRunner 'my.package.CustomInstrumentationTestRunner'
}
// ...
}
If you have other instrumentation
entries, you can switch between them either on the command line or select one in your IDE running configuration.
From @rjath's comment of @MrChaz's answer, this works better for me:
System.setProperty(
"dexmaker.dexcache",
getInstrumentation().getTargetContext().getCacheDir().getPath());
I put it in my setUp()
method.
I've managed to piece together a fix that seems to be working for me.
To the manifest I added read and write external storage.
To the test I added System.setProperty("dexmaker.dexcache", "/sdcard");
to the test.
To the emulator image I added an SD card.
I believe this works because by default mockito tries to use the apps cache directory but I never run an activity so I suspect the directory is never created by the OS