@Test(expected = NullPointerException.class)
public void testShouldThrowAnExceptionWhenClassOfTForGetWithDefaultValueIsNull() {

  // given
  String key = GIVEN_KEY;
  Class<String> classOfT = null;
  String defaultValue = "some default value";
  // when
  prefser.get(key, classOfT, defaultValue);
  // then
  // throw an exception
}