Core: Module shared environments

src/core.js

@@ -41,7 +41,7 @@ extend( QUnit, {
 		if ( executeNow instanceof Function ) {
 			config.moduleStack.push( module );
 			setCurrentModule( module );
-			executeNow( moduleFns );
+			executeNow.call( module.testEnvironment, moduleFns );
 			config.moduleStack.pop();
 			module = module.parentModule || currentModule;
 		}

test/main/modules.js

@@ -242,3 +242,25 @@ QUnit.module( "contained suite arguments", function( hooks ) {
 		} );
 	} );
 } );
+
+QUnit.module( "contained suite `this`", function( hooks ) {
+	this.outerBefore = 0;
+
+	hooks.beforeEach( function() {
+		this.outerBefore++;
+	} );
+
+	hooks.afterEach( function( assert ) {
+		assert.equal( this.outerBefore, 42 );
+	} );
+
+	QUnit.test( "`this` is shared from modules to the tests", function( assert ) {
+		assert.equal(this.outerBefore, 1, "beforeEach updated environment" );
+		this.outerBefore += 41;
+	} );
+
+	QUnit.test( "sibling tests don't share environments", function( assert ) {
+		assert.equal(this.outerBefore, 1 );
+		this.outerBefore += 41;
+	} );
+} );