fix test

mailbox-android/src/test/java/org/briarproject/mailbox/android/login/SetupActivityTest.java

 package org.briarproject.mailbox.android.login;
 
 import org.briarproject.mailbox.android.TestMailboxApplication;
+import org.junit.Assert;
 import org.junit.Before;
+import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.Robolectric;
@@ -20,4 +22,9 @@ public class SetupActivityTest {
 		MockitoAnnotations.initMocks(this);
 		setupActivity = Robolectric.setupActivity(SetupActivity.class);
 	}
+
+	@Test
+	public void testNicknameUI() {
+		Assert.assertNotNull(setupActivity);
+	}
 }