@Test
 public void expect_Preference_To_BeUnset() throws Exception {
   mPreference.set(mTestValue);
   mPreference.delete();
   final long value = mPreference.get();
   assertNotEquals(value, mTestValue);
 }
 @Test
 public void expect_Preference_NotTo_EqualValue() throws Exception {
   mPreference.set(77L);
   final long value = mPreference.get();
   assertNotEquals(value, mTestValue);
 }
 @Test
 public void expect_Preference_To_EqualDefaultValue_BeforeBeingSet() throws Exception {
   final long value = mPreference.get();
   assertEquals(value, mDefaultValue);
   assertNotEquals(value, mTestValue);
 }
 @Test
 public void expect_Preference_To_BeSet() throws Exception {
   mPreference.set(mTestValue);
   assertTrue(mPreference.isSet());
 }
 @Test
 public void expect_Preference_NotTo_BeSet() throws Exception {
   assertFalse(mPreference.isSet());
 }
 @Test
 public void expect_Preference_To_EqualDefaultValue() throws Exception {
   final SharedPreferences sharedPreferences = getSharedPreferences();
   LongPreference preference = new LongPreference(sharedPreferences, PREFERENCES_KEY);
   assertEquals(preference.get(), LongPreference.DEFAULT_VALUE_VALUE, mDelta);
 }