it('should return a function', done => {
		const src = [1, 2, 3];
		const inp = es.readArray(src);
		const factory = util.combine(inp);
		factory.should.be.type('function');
		done();
	});

gulp.task('create:common-less', () => {
	const theme = {
		'@theme-color': config.publicConfig.themeColor,
		'@resources-url': `"${config.publicConfig.resourcesUrl}"`
	};
	const vinyl = new Vinyl({
		path: 'common.less',
		contents: new Buffer('\n')
	});
	return es.readArray([vinyl]).pipe(lessVars(theme)).pipe(gulp.dest('./src/sites/common/'));
});

		.then(fileNames => {
			const files = fileNames
				.map(fileName => path.join(extensionPath, fileName))
				.map(filePath => new File({
					path: filePath,
					stat: fs.statSync(filePath),
					base: extensionPath,
					contents: fs.createReadStream(filePath) as any
				}));

			es.readArray(files).pipe(result);
		})

        it("should modify the file contents", (done) => {
            var fakeFile = new TestFile({
                contents: es.readArray(["<", "My", "Component", "/>"])
            });

            var trans = transform();
            trans.write(fakeFile);
            trans.once("data", (file: any) => {
                expect(file.isStream()).to.be.true;

                file.contents.pipe(es.wait((err: any, data: any) => {
                    expect(data.toString()).to.equal("ViewHost.render(MyComponent, null);");
                    done();
                }));
            });
        });

gulp.task("es:readArray ", () => {
    var reader = es.readArray([1, 2, 3]);
});