code: function (expected, message) {
  		// increment internal step counter.
  		QUnit.config.current.step++;
  		if (typeof message === "undefined") {
  			message = "step " + expected;
  		}
  		var actual = QUnit.config.current.step;
  		QUnit.push(QUnit.equiv(actual, expected), actual, expected, message);
  	}
docs: Check the sequence/order
  
  @example test('Example unit test', function(assert) { assert.step(1); setTimeout(function () { assert.step(3); start(); }, 100); assert.step(2); stop(); });
  @param Number expected The excepted step within the test()
  @param String message (optional)