Testing a Snackbar in a Fragment with Robolectric fails

[martijndebruijn]

When testing a Snackbar in a Fragment with Robolectric the test fails due to an UnsupportedOperationException. Any idea how to solve this?

java.lang.UnsupportedOperationException: ugh, this doesn't work still?
    at org.robolectric.shadows.ShadowAssetManager.getAndResolve(ShadowAssetManager.java:290)
    at org.robolectric.shadows.ShadowAssetManager.getAndResolve(ShadowAssetManager.java:273)
    at org.robolectric.shadows.ShadowAssetManager.getResourceValue(ShadowAssetManager.java:85)
    at android.content.res.AssetManager.getResourceValue(AssetManager.java)
    at android.content.res.Resources.getValue(Resources.java:1114)
    at android.content.res.Resources.loadXmlResourceParser(Resources.java:2304)
    at android.content.res.Resources.getLayout(Resources.java:934)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:395)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
    at com.github.mrengineer13.snackbar.SnackBar.<init>(SnackBar.java:96)
    at com.myapp.MyFragment.showFailed(MyFragment.java:273)
    at com.myapp.MyFragmentRobolectricTest.showFailed_success(MyFragmentRobolectricTest.java:58)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:250)
    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:177)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:86)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:49)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:69)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:50)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
    at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
    at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:105)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:355)
    at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:64)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)

[Jon Wimer]

How are you using SnackBar in your Fragment?

[martijndebruijn]

I've found the cause of the problem. Robolectric fails to retrieve a Resource from an external library. It fails retrieving the layout file.
I've copied the library sources in my own project and the test succeeds.

Unfortunately I don't know how to solve this issue with Robolectric. I tried another external library
(https://github.com/wmora/snackbar) but facing the same problems.

[Jon Wimer]

This seems more like a Roboelectric issue than a SnackBar one so I'm going to close this. If you do find out a solution, please feel free to post it here.