java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.robolectric.internal.ShadowExtractor.extract(ShadowExtractor.java:5)
at org.robolectric.Shadows.shadowOf(Shadows.java:1190)
at org.robolectric.util.ComponentController.(ComponentController.java:31)
at org.robolectric.util.ComponentController.(ComponentController.java:23)
at org.robolectric.util.ActivityController.(ActivityController.java:40)
at org.robolectric.util.ActivityController.of(ActivityController.java:32)
at org.robolectric.Robolectric.buildActivity(Robolectric.java:82)
at org.robolectric.Robolectric.buildActivity(Robolectric.java:78)
at uk.co.placona.tradesafe.view.EditActivityTest.ActivityShouldNotBeNull(EditActivityTest.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)

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