``` java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:197) at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:129) at org.briarproject.briar.android.activity.BriarActivity.setUpCustomToolbar(BriarActivity.java:109) at org.briarproject.briar.android.forum.ForumActivity.onCreate(ForumActivity.java:66) at android.app.Activity.performCreate(Activity.java:5933) at org.robolectric.util.ReflectionHelpers.callInstanceMethod(ReflectionHelpers.java:195) at org.robolectric.util.ActivityController$1.run(ActivityController.java:122) at org.robolectric.shadows.ShadowLooper.runPaused(ShadowLooper.java:304) at org.robolectric.shadows.CoreShadowsAdapter$2.runPaused(CoreShadowsAdapter.java:45) at org.robolectric.util.ActivityController.create(ActivityController.java:118) at org.robolectric.util.ActivityController.create(ActivityController.java:129) at org.briarproject.briar.android.forum.ForumActivityTest.setUp(ForumActivityTest.java:93) ```