private static boolean artifactEquals(Artifact a1, Artifact a2) {
        if (a1 == a2) {
            return true;
        }

        return Objects.equals(a1.getGroupId(), a2.getGroupId())
                && Objects.equals(a1.getArtifactId(), a2.getArtifactId())
                && Objects.equals(a1.getType(), a2.getType())
                && Objects.equals(a1.getVersion(), a2.getVersion())

        "1-123"
    };

    private static final String[] VERSIONS_NUMBER = {
        "2.0", "2.0.a", "2-1", "2.0.2", "2.0.123", "2.1.0", "2.1-a", "2.1b", "2.1-c", "2.1-1", "2.1.0.1", "2.2",
        "2.123", "11.a2", "11.a11", "11.b2", "11.b11", "11.m2", "11.m11", "11", "11.a", "11b", "11c", "11m"
    };

    private void checkVersionsOrder(String[] versions) {
        Comparable[] c = new Comparable[versions.length];

    }

    @Test
    void testMirrorStopOnFirstMatch() {
        // exact matches win first
        Mirror mirrorA2 = newMirror("a2", "a,b", "http://a2");
        Mirror mirrorA = newMirror("a", "a", "http://a");
        // make sure repeated entries are skipped
        Mirror mirrorA3 = newMirror("a", "a", "http://a3");

                return model;
            }
        }
    }

    private boolean withinSameGav(Artifact a1, Artifact a2) {
        return Objects.equals(a1.getGroupId(), a2.getGroupId())
                && Objects.equals(a1.getArtifactId(), a2.getArtifactId())
                && Objects.equals(a1.getVersion(), a2.getVersion());
    }