assertNull(pluginHelper.getArtifact("test", null));
        assertNull(pluginHelper.getArtifact("", "1.0.0"));
        assertNull(pluginHelper.getArtifact("test", ""));
    }

    public void test_isExcludedName_crawler() {
        assertTrue(pluginHelper.isExcludedName(ArtifactType.CRAWLER, "fess-crawler"));
        assertTrue(pluginHelper.isExcludedName(ArtifactType.CRAWLER, "fess-crawler-db"));