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diff --git a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_test.html b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor_test.html
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+<!--
+@license
+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-default-editor</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-default-editor.html">
+
+<script>void(0);</script>
+
+<test-fixture id="basic">
+  <template>
+    <gr-default-editor></gr-default-editor>
+  </template>
+</test-fixture>
+
+<script>
+  suite('gr-default-editor tests', () => {
+    let element;
+
+    setup(() => {
+      element = fixture('basic');
+      element.fileContent = '';
+    });
+
+    test('fires content-change event', done => {
+      const contentChangedHandler = e => {
+        assert.equal(e.detail.value, 'test');
+        done();
+      };
+      const textarea = element.$.textarea;
+      element.addEventListener('content-change', contentChangedHandler);
+      textarea.value = 'test';
+      textarea.dispatchEvent(new CustomEvent('input',
+          {target: textarea, bubbles: true}));
+    });
+  });
+</script>