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This exception has no message.
java.lang.NullPointerException: 	at org.robolectric.internal.ShadowExtractor.extract(	at org.robolectric.Shadows.shadowOf(	at org.robolectric.shadows.CoreShadowsAdapter.getMainLooper(	at org.robolectric.util.ComponentController.(	at org.robolectric.util.ComponentController.(	at org.robolectric.util.ActivityController.(	at org.robolectric.util.ActivityController.of(	at org.robolectric.Robolectric.buildActivity(	at org.robolectric.Robolectric.buildActivity(	at org.robolectric.Robolectric.setupActivity(	at	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at org.junit.internal.runners.TestMethod.invoke(