public T get(String key) {
    return delegate.get(key.toLowerCase());
  }
@Test
  public void testGet() throws Exception {
    String someKey = "someKey";
    Object someValue = mock(Object.class);

    when(someMap.get(someKey.toLowerCase())).thenReturn(someValue);

    assertEquals(someValue, caseInsensitiveMapWrapper.get(someKey));

    verify(someMap, times(1)).get(someKey.toLowerCase());
  }