bower_components/iron-list/test/physical-count.html

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<html>
<head>
  <meta charset="UTF-8">
  <title>iron-list test</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
  <script src="../../webcomponentsjs/webcomponents-lite.js"></script>
  <script src="../../web-component-tester/browser.js"></script>
  <link rel="import" href="helpers.html">
  <link rel="import" href="x-list.html">
</head>
<body>
  <test-fixture id="trivialList">
    <template>
      <x-list list-height="100" item-height="2"></x-list>
    </template>
  </test-fixture>
  <test-fixture id="trivialListSmall">
    <template>
      <x-list list-height="2" item-height="2"></x-list>
    </template>
  </test-fixture>
  <script>
    suite('dynamic physical count', function() {
      var list, container;
      setup(function() {
        container = fixture('trivialList');
        list = container.list;
        list.items = buildDataSet(200);
      });
      test('increase pool size', function(done) {
        setTimeout(function() {
          list.scrollTop = 0;
          var lastItem = getLastItemFromList(list);
          var lastItemHeight = lastItem.offsetHeight;
          var expectedFinalItem = container.listHeight/lastItemHeight - 1;
          assert.equal(list.offsetHeight, container.listHeight);
          assert.equal(lastItemHeight, 2);
          assert.isTrue(isFullOfItems(list));
          assert.equal(lastItem.textContent, expectedFinalItem);
          done();
        }, 100);
      });
    });
    suite('iron-resize', function() {
      var list, container;
      setup(function() {
        container = fixture('trivialListSmall');
        list = container.list;
        list.style.display = 'none';
        list.items = buildDataSet(200);
      });
      test('increase pool size after resizing the list', function(done) {
        flush(function() {
          list.style.display = '';
          assert.notEqual(getFirstItemFromList(list).textContent, '0', 'Item should not be rendered');
          list.fire('iron-resize');
          flush(function() {
            assert.equal(getFirstItemFromList(list).textContent, '0', 'Item should be rendered');
            done();
          });
        });
      });
    });
  </script>
</body>
</html>