@Test
public void testFindFailType() {

    ExtensionFinder instance = new AbstractExtensionFinder(pluginManager) {
        @Override
        public Map<String, Set<String>> readPluginsStorages() {
            return Collections.emptyMap();
        }
        @Override
        public Map<String, Set<String>> readClasspathStorages() {
            return Collections.emptyMap();
        }
    };
    List<ExtensionWrapper<FailTestPlugin>> list = instance.find(FailTestPlugin.class);
    assertEquals(0, list.size());
}