apache beam seems to not be running the tests

To run it, you have to run it by pipeline.run(). Add it in your test method as the following and try again please.

    @Test
    public void testPrintFunctionDoesNotMutateData () {
        Object genericObject = new Object();
        PCollection<Object> collection = pipeline
                .apply(Create.of(genericObject).withCoder(AvroCoder.of(Object.class)))
                .apply(ParDo.of(print("Label")));

        PAssert.that(collection).empty();
        PAssert.that(collection).containsInAnyOrder(genericObject);

        pipeline.run();
    }