public List<String> extensionNames() {
        return stream().map(PluginInfo::getExtensionName).collect(toList());
    }
@Test
    public void shouldGetExtensionNamesOfAllExtensionsContainedWithin() {
        CombinedPluginInfo pluginInfo = new CombinedPluginInfo(List.of(
                new PluggableTaskPluginInfo(null, null, null),
                new NotificationPluginInfo(null, null)));

        assertThat(pluginInfo.extensionNames().size(), is(2));
        assertThat(pluginInfo.extensionNames(), hasItems(NOTIFICATION_EXTENSION, PLUGGABLE_TASK_EXTENSION));
    }