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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-page-nav</title>
<script src="/test/common-test-setup.js"></script>
<script src="/bower_components/webcomponentsjs/custom-elements-es5-adapter.js"></script>

<script src="/bower_components/page/page.js"></script>
<script src="/bower_components/webcomponentsjs/webcomponents-lite.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-page-nav.html">

<script>void(0);</script>

<test-fixture id="basic">
  <template>
    <gr-page-nav>
      <ul>
        <li>item</li>
      </ul>
    </gr-page-nav>
  </template>
</test-fixture>

<script>
  suite('gr-page-nav tests', () => {
    let element;
    let sandbox;

    setup(() => {
      sandbox = sinon.sandbox.create();
      element = fixture('basic');
      flushAsynchronousOperations();
    });

    teardown(() => {
      sandbox.restore();
    });

    test('header is not pinned just below top', () => {
      sandbox.stub(element, '_getOffsetParent', () => 0);
      sandbox.stub(element, '_getOffsetTop', () => 10);
      sandbox.stub(element, '_getScrollY', () => 5);
      element._handleBodyScroll();
      assert.isFalse(element.$.nav.classList.contains('pinned'));
    });

    test('header is pinned when scroll down the page', () => {
      sandbox.stub(element, '_getOffsetParent', () => 0);
      sandbox.stub(element, '_getOffsetTop', () => 10);
      sandbox.stub(element, '_getScrollY', () => 25);
      window.scrollY = 100;
      element._handleBodyScroll();
      assert.isTrue(element.$.nav.classList.contains('pinned'));
    });

    test('header is not pinned just below top with header set', () => {
      element._headerHeight = 20;
      sandbox.stub(element, '_getScrollY', () => 15);
      window.scrollY = 100;
      element._handleBodyScroll();
      assert.isFalse(element.$.nav.classList.contains('pinned'));
    });

    test('header is pinned when scroll down the page with header set', () => {
      element._headerHeight = 20;
      sandbox.stub(element, '_getScrollY', () => 25);
      window.scrollY = 100;
      element._handleBodyScroll();
      assert.isTrue(element.$.nav.classList.contains('pinned'));
    });
  });
</script>