@Test
public void testTransformIdentityFunction(TestContext context) {

    String input = "{\n" +
            "  \"rating\": {\n" +
            "    \"primary\": {\n" +
            "      \"value\": 3\n" +
            "    }\n" +
            "  }\n" +
            "}";
    context.assertEquals(new JsonObject(input), JoltTransformer.transform(input, identitySpec).result(),
            "the output is expected to be equal to the input");
}