Dropwizard representation round trip test (instance -> json -> instance)

dropwizard-json-round-trip-test.java

public static <T> void jsonRoundTripTest(final T instance) throws Exception {
        final String clazz = instance.getClass().getName();
        final String fixtureName = instance.getClass().getSimpleName().toLowerCase();
        final String fixture = jsonFixture("fixtures/" + fixtureName + ".json");
        assertThat(clazz + " bad json,",
                asJson(instance),
                is(fixture));
        T deserialized;
        try {
            deserialized = fromJson(fixture, (Class<T>)instance.getClass());
        }
        catch(final Exception e) {
            throw new Exception("Can't deserialize:\n" + asJson(instance), e);
        }
        assertThat(clazz + " bad equals,",
                deserialized,
                is(instance));
        assertEquals(clazz + " bad hashcode,",
                deserialized.hashCode(),
                instance.hashCode());
}

Cool snippet! Something like this should probably ship as part of dropwizard-testing.

@andreisavu -> https://github.com/codahale/dropwizard/pull/151

thanks!

@andreisavu FYI: Coda didn't agree on it being a good thing to include, but on the other hand it's a small enough code snippet to copy-n-paste into your own codebase.