public static void assertHasSinglePrivateUnusableConstructor(Class<?> cls) throws Exception {
    try {
      assertHasSinglePrivateConstructor(cls);
      throw new AssertionError("Constructor didn't blow up");
    } catch (InvocationTargetException e) {
      // Good
    }
  }
Provides common utilities helpful for testing.
jobdispatcher/src/testLib/com/firebase/jobdispatcher/TestUtil.java