@Test
    public void test_getArtifact_notFound() {
        Artifact result = pluginHelper.getArtifact("non-existent", "1.0.0");
        assertNull(result);
    }

    @Test
    public void test_getArtifact_nullInputs() {
        assertNull(pluginHelper.getArtifact(null, "1.0.0"));
        assertNull(pluginHelper.getArtifact("test", null));
        assertNull(pluginHelper.getArtifact("", "1.0.0"));