Gruntfile.js

@@ -139,6 +139,7 @@ grunt.initConfig( {
 			"test/logs",
 			"test/main/test",
 			"test/main/assert",
+			"test/main/assert/step",
 			"test/main/async",
 			"test/main/promise",
 			"test/main/modules",

src/assert.js

@@ -14,6 +14,25 @@ class Assert {
 
 	// Assert helpers
 
+	// Documents a "step", which is a string value, in a test as a passing assertion
+	step( message ) {
+		let result = !!message;
+
+		message = message || "You must provide a message to assert.step";
+
+		this.test.steps.push( message );
+
+		return this.pushResult( {
+			result,
+			message
+		} );
+	}
+
+	// Verifies the steps in a test match a given array of string values
+	verifySteps( steps, message ) {
+		this.deepEqual( this.test.steps, steps, message );
+	}
+
 	// Specify the number of expected assertions to guarantee that failed test
 	// (no assertions are run at all) don't slip through.
 	expect( asserts ) {

src/test.js

@@ -25,6 +25,7 @@ export default function Test( settings ) {
 	this.usedAsync = false;
 	this.module = config.currentModule;
 	this.stack = sourceFromStacktrace( 3 );
+	this.steps = [];
 
 	// Register unique strings
 	for ( i = 0, l = this.module.tests; i < l.length; i++ ) {

test/index.html

@@ -7,6 +7,7 @@
 	<script src="../dist/qunit.js"></script>
 	<script src="main/test.js"></script>
 	<script src="main/assert.js"></script>
+	<script src="main/assert/step.js"></script>
 	<script src="main/async.js"></script>
 	<script src="main/promise.js"></script>
 	<script src="main/dump.js"></script>

test/main/assert/step.js

@@ -0,0 +1,58 @@
+QUnit.module( "assert.step" );
+
+QUnit.test( "pushes a failing assertion if no message is given", function( assert ) {
+	assert.expect( 2 );
+
+	var originalPushResult = assert.pushResult;
+	assert.pushResult = function pushResultStub( resultInfo ) {
+		assert.pushResult = originalPushResult;
+
+		assert.notOk( resultInfo.result );
+		assert.equal( resultInfo.message, "You must provide a message to assert.step" );
+	};
+
+	assert.step();
+} );
+
+QUnit.test( "pushes a failing assertion if empty message is given", function( assert ) {
+	assert.expect( 2 );
+
+	var originalPushResult = assert.pushResult;
+	assert.pushResult = function pushResultStub( resultInfo ) {
+		assert.pushResult = originalPushResult;
+
+		assert.notOk( resultInfo.result );
+		assert.equal( resultInfo.message, "You must provide a message to assert.step" );
+	};
+
+	assert.step( "" );
+} );
+
+QUnit.test( "pushes a passing assertion if a message is given", function( assert ) {
+	assert.expect( 2 );
+
+	assert.step( "One step" );
+	assert.step( "Two step" );
+} );
+
+QUnit.module( "assert.verifySteps" );
+
+QUnit.test( "verifies the order and value of steps", function( assert ) {
+	assert.expect( 6 );
+
+	assert.step( "One step" );
+	assert.step( "Two step" );
+	assert.step( "Red step" );
+	assert.step( "Blue step" );
+
+	assert.verifySteps( [ "One step", "Two step", "Red step", "Blue step" ] );
+
+	var originalPushResult = assert.pushResult;
+	assert.pushResult = function pushResultStub( resultInfo ) {
+		assert.pushResult = originalPushResult;
+
+		assert.notOk( resultInfo.result );
+	};
+
+	assert.verifySteps( [ "One step", "Red step", "Two step", "Blue step" ] );
+} );