Handle no books installed on start properly.

app/src/androidTest/java/org/bspeice/minimalbible/test/activity/viewer/BibleViewerTest.java

@@ -0,0 +1,42 @@
+package org.bspeice.minimalbible.test.activity.viewer;
+
+import android.test.ActivityInstrumentationTestCase2;
+
+import org.bspeice.minimalbible.Modules;
+import org.bspeice.minimalbible.activity.viewer.BibleViewer;
+import org.bspeice.minimalbible.activity.viewer.BookManager;
+import org.crosswire.jsword.book.Book;
+
+import java.util.ArrayList;
+
+import rx.Observable;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class BibleViewerTest extends ActivityInstrumentationTestCase2<BibleViewer> {
+
+    public BibleViewerTest() {
+        super(BibleViewer.class);
+    }
+
+    public void setUp() {
+        // For some reason this test requires us to set the dexcache...
+        System.setProperty("dexmaker.dexcache", getInstrumentation().getTargetContext()
+                .getCacheDir().toString());
+    }
+
+    /**
+     * It may happen to be the case that we start and there are no installed books.
+     * This likely triggers a runtime exception from Rx, and is no excuse for dying.
+     */
+    public void testInitializationNoInstalledBooks() {
+        BookManager mockBookManager = mock(BookManager.class);
+        when(mockBookManager.getInstalledBooks()).thenReturn(
+                Observable.from(new ArrayList<Book>()));
+        Modules.testModules.setBookManager(mockBookManager);
+
+        assertNotNull(getActivity());
+    }
+
+}