Robolectric does not support loading resources from an Android Library project such as ActionBarSherlock of FlyInMenu, so this patch allows you to specify a library project to load resources in tests.

robolectric-library-resource-loading.java

// In ResourceLoader.java I added the following method:
//
  public void loadLibraryProjectResources(File libraryProjectRoot) throws Exception {
    File systemResourceDir = getSystemResourceDir(getPathToAndroidResources());
    File localValueResourceDir = getValueResourceDir(libraryProjectRoot);
    File systemValueResourceDir = getValueResourceDir(systemResourceDir);

    loadStringResources(localValueResourceDir, systemValueResourceDir);
    loadPluralsResources(localValueResourceDir, systemValueResourceDir);
    loadValueResources(localValueResourceDir, systemValueResourceDir);
    loadDimenResources(localValueResourceDir, systemValueResourceDir);
    loadIntegerResource(localValueResourceDir, systemValueResourceDir);
    loadViewResources(systemResourceDir, libraryProjectRoot);
    loadMenuResources(libraryProjectRoot);
    loadDrawableResources(libraryProjectRoot);
  }

// Then you need a custom test runner such as:
public class MyTestRunner extends RobolectricTestRunner {
  public MyTestRunner(Class<?> testClass) throws InitializationError {
    super(testClass);
  }

  @Override public void beforeTest(Method method) {
    try {
      Robolectric.getShadowApplication().getResourceLoader().loadLibraryProjectResources(new File("submodules/flyinmenu/library/res"));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

Where does the getSystemResourceDir comes from? Could you please provide the complete java file including the imports?