artifact.setGroupId(null);
        assertEquals(null + ":" + artifactId + ":" + type + ":" + classifier, artifact.getDependencyConflictId());
    }

    @Test
    void testGetDependencyConflictIdNullClassifier() {
        artifact = new DefaultArtifact(groupId, artifactId, versionRange, scope, type, null, artifactHandler);
        assertEquals(groupId + ":" + artifactId + ":" + type, artifact.getDependencyConflictId());