IncludesArtifactFilter f1 = new IncludesArtifactFilter(patterns);

        IncludesArtifactFilter f2 = new IncludesArtifactFilter(patterns);

        assertTrue(f1.equals(f2));
        assertTrue(f2.equals(f1));
        assertTrue(f1.hashCode() == f2.hashCode());

        IncludesArtifactFilter f3 = new IncludesArtifactFilter(Arrays.asList("d", "c", "e"));
        assertTrue(f1.equals(f3));

        File f2 = getTestFile("src/test/resources/projects/grandchild-check/child/grandchild/pom.xml");

        getProject(f1);

        // it's the building of the grandchild project, having already cached the child project
        // (but not the parent project), which causes the problem.
        getProject(f2);
    }