@Test
public void getKey_should_generate_serialized_key() throws Exception {

    // given
    final ContentCacheKey key =
            new TransformationCacheKey("prep1", "dataset1", "JSON", "step1", "param1", HEAD, "user1", "");
    // when
    final String keyStr = key.getKey();
    // then
    assertThat(keyStr, is("transformation_prep1_dataset1_b6aa01425c31e1eed71d0c3cbc7763aad865d1b1"));
}