@Test
public void testEmptyClassNames() {

    when(configuration.getString(eq("zuul.filters.classes"), anyString())).thenReturn("  ");
    when(configuration.getString(eq("zuul.filters.packages"), anyString())).thenReturn("  ");
    String[] classNames = module.findClassNames(configuration);
    assertThat(classNames.length, equalTo(0));
}