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diff --git a/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_test.html b/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style_test.html
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+<!DOCTYPE html>
+<!--
+Copyright (C) 2017 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
+<title>gr-external-style</title>
+
+<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
+<script src="../../../bower_components/web-component-tester/browser.js"></script>
+<link rel="import" href="../../../test/common-test-setup.html"/>
+<link rel="import" href="gr-external-style.html">
+
+<test-fixture id="basic">
+  <template>
+    <gr-external-style name="foo"></gr-external-style>
+  </template>
+</test-fixture>
+
+<script>
+  suite('gr-external-style integration tests', () => {
+    let sandbox;
+    let element;
+
+    setup(done => {
+      sandbox = sinon.sandbox.create();
+
+      // NB: Order is important.
+      let plugin;
+      Gerrit.install(p => {
+        plugin = p;
+        plugin.registerStyleModule('foo', 'some-module');
+      }, '0.1', 'http://some/plugin/url.html');
+
+      sandbox.stub(Gerrit, 'awaitPluginsLoaded').returns(Promise.resolve());
+
+      element = fixture('basic');
+      sandbox.stub(element, '_applyStyle');
+      sandbox.stub(element, 'importHref', (url, resolve) => { resolve(); });
+
+      flush(done);
+    });
+
+    teardown(() => {
+      sandbox.restore();
+    });
+
+    test('imports plugin-provided module', () => {
+      assert.isTrue(element.importHref.calledWith(
+          new URL('http://some/plugin/url.html')));
+    });
+
+    test('applies plugin-provided styles', () => {
+      assert.isTrue(element._applyStyle.calledWith('some-module'));
+    });
+  });
+</script>