polyfill/intersection-observer-test.html

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <title>IntersectionObserver Tests</title>

  <!-- Dependencies -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/2.5.3/mocha.min.css">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/2.5.3/mocha.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/expect.js/0.2.0/expect.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/1.15.4/sinon.min.js"></script>

  <!-- Polyfills for IE7-8 -->
  <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=es5,getComputedStyle"></script>
</head>
<body>
  <div id="mocha"></div>

  <!-- Setup -->
  <script>mocha.setup({ui:'bdd'});</script>

  <!-- Script under test -->
  <script src="intersection-observer.js"></script>

  <!-- Tests -->
  <script src="intersection-observer-test.js"></script>

  <!-- Reporting -->
  <script>
  var runner = mocha.run();
  var failedTests = [];

  runner.on('end', function(){
    window.mochaResults = runner.stats;
    window.mochaResults.reports = failedTests;
  });

  runner.on('fail', function(test, err){
    var flattenTitles = function(test){
      var titles = [];
      while (test.parent.title){
        titles.push(test.parent.title);
        test = test.parent;
      }
      return titles.reverse();
    };

    failedTests.push({
      name: test.title,
      result: false,
      message: err.message,
      stack: err.stack,
      titles: flattenTitles(test)
    });
  });
  </script>
</body>
</html>