How to write automated unit tests for java annotation processor?

Question

I\'m experimenting with java annotation processors. I\'m able to write integration tests using the \"JavaCompiler\" (in fact I\'m using \"hickory\" at the moment). I can run the

Answer 1

jOOR is a small Java reflection library that also provides simplified access to the in-memory Java compilation API in javax.tool.JavaCompiler. We added support for this to unit test jOOQ's annotation processors. You can easily write unit tests like this:

@Test
public void testCompileWithAnnotationProcessors() {
    AProcessor p = new AProcessor();

    try {
        Reflect.compile(
            "org.joor.test.FailAnnotationProcessing",
            "package org.joor.test; " +
            "@A " +
            "public class FailAnnotationProcessing { " +
            "}",
            new CompileOptions().processors(p)
        ).create().get();
        Assert.fail();
    }
    catch (ReflectException expected) {
        assertFalse(p.processed);
    }
}

The above example has been taken from this blog post