mfExtend.test.js
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mfExtend.test.js
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	let mfExtend;
	const
	sinon = require( 'sinon' ),
	oo = require( '../utils/oo' );

	/** @type {sinon.SinonSandbox} */ let sandbox;

	QUnit.module( 'MobileFrontend mfExtend.test.js', {
	beforeEach: function () {
	sandbox = sinon.sandbox.create();
	oo.setUp( sandbox, global );
	mfExtend = require( '../../../src/mobile.startup/mfExtend' );
	},
	afterEach: function () {
	sandbox.restore();
	}
	} );

	QUnit.test( 'mfExtend() - extending from constructor', function ( assert ) {
	function TestChild() {}
	function TestPrototype() {}
	mfExtend( TestChild, TestPrototype, {} );
	assert.true( TestChild.prototype instanceof TestPrototype );
	} );

	QUnit.test( 'mfExtend() - extending from object', function ( assert ) {
	const testPrototype = new TestPrototype();
	function TestChild() {}
	function TestPrototype() {
	this.protoMethod = function () {
	return true;
	};
	}
	mfExtend( TestChild, testPrototype );
	const testChild = new TestChild();
	assert.strictEqual( testChild.protoMethod(), true );
	} );

	QUnit.test( 'mfExtend() - extending from constructor with overrides', function ( assert ) {
	function TestChild() {}
	function TestPrototype() {
	this.protoMethod = function () {
	return true;
	};
	}
	mfExtend( TestChild, TestPrototype, {
	protoMethod: function () {
	return false;
	}
	} );
	const testChild = new TestChild();
	assert.strictEqual( testChild.protoMethod(), false );
	} );