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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-endpoint-decorator</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-endpoint-decorator.html">
+<link rel="import" href="../gr-endpoint-param/gr-endpoint-param.html">
+
+<script>void(0);</script>
+
+<test-fixture id="basic">
+  <template>
+    <gr-endpoint-decorator name="foo">
+      <gr-endpoint-param name="someparam" value="barbar"></gr-endpoint-param>
+    </gr-endpoint-decorator>
+  </template>
+</test-fixture>
+
+<script>
+  suite('gr-endpoint-decorator', () => {
+    let sandbox;
+    let element;
+    let plugin;
+    let domHookStub;
+
+    setup(done => {
+      Gerrit._endpoints = new GrPluginEndpoints();
+
+      sandbox = sinon.sandbox.create();
+
+      domHookStub = {
+        handleInstanceAttached: sandbox.stub(),
+        handleInstanceDetached: sandbox.stub(),
+        getPublicAPI: () => domHookStub,
+      };
+      sandbox.stub(
+          GrDomHooksManager.prototype, 'getDomHook').returns(domHookStub);
+
+      // NB: Order is important.
+      Gerrit.install(p => {
+        plugin = p;
+        plugin.registerCustomComponent('foo', 'some-module');
+        plugin.registerCustomComponent('foo', 'other-module', {replace: true});
+        plugin.registerCustomComponent('bar', 'some-module');
+      }, '0.1', 'http://some/plugin/url.html');
+
+      sandbox.stub(Gerrit, '_arePluginsLoaded').returns(true);
+      sandbox.stub(Gerrit, 'awaitPluginsLoaded').returns(Promise.resolve());
+
+      element = fixture('basic');
+      sandbox.stub(element, '_initDecoration').returns({});
+      sandbox.stub(element, '_initReplacement').returns({});
+      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('inits decoration dom hook', () => {
+      assert.strictEqual(
+          element._initDecoration.lastCall.args[0], 'some-module');
+      assert.strictEqual(
+          element._initDecoration.lastCall.args[1], plugin);
+    });
+
+    test('inits replacement dom hook', () => {
+      assert.strictEqual(
+          element._initReplacement.lastCall.args[0], 'other-module');
+      assert.strictEqual(
+          element._initReplacement.lastCall.args[1], plugin);
+    });
+
+    test('calls dom hook handleInstanceAttached', () => {
+      assert.equal(domHookStub.handleInstanceAttached.callCount, 2);
+    });
+
+    test('calls dom hook handleInstanceDetached', () => {
+      element.detached();
+      assert.equal(domHookStub.handleInstanceDetached.callCount, 2);
+    });
+
+    test('installs modules on late registration', done => {
+      domHookStub.handleInstanceAttached.reset();
+      plugin.registerCustomComponent('foo', 'noob-noob');
+      flush(() => {
+        assert.equal(domHookStub.handleInstanceAttached.callCount, 1);
+        assert.strictEqual(
+            element._initDecoration.lastCall.args[0], 'noob-noob');
+        assert.strictEqual(
+            element._initDecoration.lastCall.args[1], plugin);
+        done();
+      });
+    });
+
+    test('params', () => {
+      const instance = document.createElement('foo');
+      element._initProperties(instance, plugin);
+      assert.equal(instance.someparam, 'barbar');
+    });
+  });
+</script>