implemented delay behaviour

src/lib/compile-route.js

@@ -40,11 +40,20 @@ const limitMatcher = route => {
 	route.reset = () => (timesLeft = route.repeat);
 };
 
+const delayResponse = (route) => {
+	const {delay} = route;
+	if (delay) {
+		const response = route.response;
+		route.response = new Promise(res => setTimeout(() => res(response), delay))
+	}
+}
+
 module.exports = route => {
 	validateRoute(route);
 	route = sanitizeRoute(route);
 	route.matcher = generateMatcher(route);
 	limitMatcher(route);
+	delayResponse(route)
 	return route;
 };
 

test/specs/responses.test.js

@@ -236,17 +236,17 @@ module.exports = fetchMock => {
 			});
 
 			it('function that returns a Promise', async () => {
-				fm.mock('http://it.at.there/', url => Promise.resolve('test'));
+				fm.mock('http://it.at.there/', url => Promise.resolve('test: ' + url));
 				const res = await fm.fetchHandler('http://it.at.there/');
 				expect(res.status).to.equal(200);
-				expect(await res.text()).to.equal('test');
+				expect(await res.text()).to.equal('test: http://it.at.there/');
 			});
 
 			it('Promise for a function that returns a response', async () => {
-				fm.mock('http://it.at.there/', Promise.resolve(url => 'test'));
+				fm.mock('http://it.at.there/', Promise.resolve(url => 'test: ' + url));
 				const res = await fm.fetchHandler('http://it.at.there/');
 				expect(res.status).to.equal(200);
-				expect(await res.text()).to.equal('test');
+				expect(await res.text()).to.equal('test: http://it.at.there/');
 			});
 
 			it('delay', async () => {
@@ -258,9 +258,26 @@ module.exports = fetchMock => {
 				expect(resolved).to.be.false;
 				await new Promise(res => setTimeout(res, 11))
 				expect(resolved).to.be.true;
+				const res = await req;
 				expect(res.status).to.equal(200);
 			});
 
+			it('delay a function response\'s execution', async () => {
+				const startTimestamp = new Date().getTime();
+				fm.mock('http://it.at.there/', () => ({timestamp: new Date().getTime()}), {delay: 20});
+				const req = fm.fetchHandler('http://it.at.there/');
+				let resolved = false;
+				req.then(() => resolved = true)
+				await new Promise(res => setTimeout(res, 10))
+				expect(resolved).to.be.false;
+				await new Promise(res => setTimeout(res, 11))
+				expect(resolved).to.be.true;
+				const res = await req;
+				expect(res.status).to.equal(200);
+				const responseTimestamp = (await res.json()).timestamp
+				expect(responseTimestamp - startTimestamp).to.be.within(20, 25);
+			});
+
 			it('Response', async () => {
 				fm.mock(
 					'http://it.at.there/',