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+<!DOCTYPE html>
+<!--
+@license
+Copyright (C) 2016 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-diff-preferences</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-diff-preferences.html">
+
+<script>void(0);</script>
+
+<test-fixture id="basic">
+  <template>
+    <gr-diff-preferences></gr-diff-preferences>
+  </template>
+</test-fixture>
+
+<script>
+  suite('gr-diff-preferences tests', () => {
+    let element;
+    let sandbox;
+    let diffPreferences;
+
+    function valueOf(title, fieldsetid) {
+      const sections = element.$[fieldsetid].querySelectorAll('section');
+      let titleEl;
+      for (let i = 0; i < sections.length; i++) {
+        titleEl = sections[i].querySelector('.title');
+        if (titleEl.textContent.trim() === title) {
+          return sections[i].querySelector('.value');
+        }
+      }
+    }
+
+    setup(() => {
+      diffPreferences = {
+        context: 10,
+        line_wrapping: false,
+        line_length: 100,
+        tab_size: 8,
+        font_size: 12,
+        show_tabs: true,
+        show_whitespace_errors: true,
+        syntax_highlighting: true,
+        manual_review: false,
+        ignore_whitespace: 'IGNORE_NONE',
+      };
+
+      stub('gr-rest-api-interface', {
+        getDiffPreferences() {
+          return Promise.resolve(diffPreferences);
+        },
+      });
+
+      element = fixture('basic');
+      sandbox = sinon.sandbox.create();
+      return element.loadData();
+    });
+
+    teardown(() => { sandbox.restore(); });
+
+    test('renders', () => {
+      // Rendered with the expected preferences selected.
+      assert.equal(valueOf('Context', 'diffPreferences')
+          .firstElementChild.bindValue, diffPreferences.context);
+      assert.equal(valueOf('Fit to screen', 'diffPreferences')
+          .firstElementChild.checked, diffPreferences.line_wrapping);
+      assert.equal(valueOf('Diff width', 'diffPreferences')
+          .firstElementChild.bindValue, diffPreferences.line_length);
+      assert.equal(valueOf('Tab width', 'diffPreferences')
+          .firstElementChild.bindValue, diffPreferences.tab_size);
+      assert.equal(valueOf('Font size', 'diffPreferences')
+          .firstElementChild.bindValue, diffPreferences.font_size);
+      assert.equal(valueOf('Show tabs', 'diffPreferences')
+          .firstElementChild.checked, diffPreferences.show_tabs);
+      assert.equal(valueOf('Show trailing whitespace', 'diffPreferences')
+          .firstElementChild.checked, diffPreferences.show_whitespace_errors);
+      assert.equal(valueOf('Syntax highlighting', 'diffPreferences')
+          .firstElementChild.checked, diffPreferences.syntax_highlighting);
+      assert.equal(
+          valueOf('Automatically mark viewed files reviewed', 'diffPreferences')
+              .firstElementChild.checked, diffPreferences.manual_review);
+      assert.equal(valueOf('Ignore Whitespace', 'diffPreferences')
+          .firstElementChild.bindValue, diffPreferences.ignore_whitespace);
+
+      assert.isFalse(element.hasUnsavedChanges);
+    });
+
+    test('save changes', () => {
+      sandbox.stub(element.$.restAPI, 'saveDiffPreferences')
+          .returns(Promise.resolve());
+      const showTrailingWhitespaceCheckbox =
+          valueOf('Show trailing whitespace', 'diffPreferences')
+          .firstElementChild;
+      showTrailingWhitespaceCheckbox.checked = false;
+      element._handleShowTrailingWhitespaceTap();
+
+      assert.isTrue(element.hasUnsavedChanges);
+
+      // Save the change.
+      return element.save().then(() => {
+        assert.isFalse(element.hasUnsavedChanges);
+      });
+    });
+  });
+</script>