QUnit - Async Call

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For every asynchronous operation in QUnit.test() callback, use assert.async(), which returns a "done" function that should be called when the operation has completed. assert.async() accepts call counts as a parameter. The callback returned from assert.async() will throw an Error, if it is invoked more than the accepted call count, if provided. Each done() call adds up to the call count. After every call gets completed, the test is done.

Live Demo 
<html>
   <head>
      <meta charset = "utf-8">
      <title>QUnit basic example</title>
      <link rel = "stylesheet" href = "https://code.jquery.com/qunit/qunit-1.22.0.css">
      <script src = "https://code.jquery.com/qunit/qunit-1.22.0.js"></script>
   </head>
   
   <body>
      <div id = "qunit"></div>
      <div id = "qunit-fixture"></div> 
      <script>
         QUnit.test( "multiple call test()", function( assert ) {
            var done = assert.async( 3 );
            
            setTimeout(function() {
               assert.ok( true, "first callback." );
               done();
            }, 500 );

            setTimeout(function() {
               assert.ok( true, "second callback." );
               done();
            }, 500 );

            setTimeout(function() {
               assert.ok( true, "third callback." );
               done();
            }, 500 );
         });		 
      </script>
   </body>
</html>

Verify the Output

You should see the following result −

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