@Test
public void testInGroup() {

    final TestOfflinePermissible permissible = new TestOfflinePermissible();
    permissible.setPermission("group.a", true);
    permissible.setPermission("group.b", true);
    assertTrue(resolver.inGroup(permissible, "a"));
    assertTrue(resolver.inGroup(permissible, "b"));
    assertFalse(resolver.inGroup(permissible, "c"));
}