class LegofyPicassoTransformation implements Transformation {

    @Override
    public String key() {
        return LEGOFY;
    }

}

class LegofyPicassoTransformationTest {

    @Mock
    private Context mockContext;
    private LegofyPicassoTransformation legofyPicassoTransformation;

    @Test
    public void shouldReturnKey() throws Exception {

        String key = legofyPicassoTransformation.key();

        assertThat(key).isEqualTo(LegofyPicassoTransformation.LEGOFY);
    }

}