Write POST /v1/blink unit test

Signed-off-by: Christina Wang <christina@balena.io>

test/41-device-api-v1.spec.ts

@@ -1,7 +1,14 @@
 import * as _ from 'lodash';
 import * as Bluebird from 'bluebird';
 import { expect } from 'chai';
-import { stub, spy, SinonStub, SinonSpy } from 'sinon';
+import {
+	stub,
+	spy,
+	useFakeTimers,
+	SinonStub,
+	SinonSpy,
+	SinonFakeTimers,
+} from 'sinon';
 import * as supertest from 'supertest';
 
 import * as appMock from './lib/application-state-mock';
@@ -18,6 +25,7 @@ import * as dbus from '../src//lib/dbus';
 import * as updateLock from '../src/lib/update-lock';
 import * as TargetState from '../src/device-state/target-state';
 import * as targetStateCache from '../src/device-state/target-state-cache';
+import blink = require('../src/lib/blink');
 
 import { UpdatesLockedError } from '../src/lib/errors';
 
@@ -615,5 +623,44 @@ describe('SupervisorAPI [V1 Endpoints]', () => {
 		});
 	});
 
+	describe('POST /v1/blink', () => {
+		// Further blink function-specific testing located in 07-blink.spec.ts
+		it('responds with code 200 and empty body', async () => {
+			await request
+				.post('/v1/blink')
+				.set('Accept', 'application/json')
+				.set('Authorization', `Bearer ${apiKeys.cloudApiKey}`)
+				.expect(sampleResponses.V1.POST['/blink'].statusCode)
+				.then((response) => {
+					expect(response.body).to.deep.equal(
+						sampleResponses.V1.POST['/blink'].body,
+					);
+					expect(response.text).to.deep.equal(
+						sampleResponses.V1.POST['/blink'].text,
+					);
+				});
+		});
+
+		it('directs device to blink for 15000ms (hardcoded length)', async () => {
+			const blinkStartSpy: SinonSpy = spy(blink.pattern, 'start');
+			const blinkStopSpy: SinonSpy = spy(blink.pattern, 'stop');
+			const clock: SinonFakeTimers = useFakeTimers();
+
+			await request
+				.post('/v1/blink')
+				.set('Accept', 'application/json')
+				.set('Authorization', `Bearer ${apiKeys.cloudApiKey}`)
+				.then(() => {
+					expect(blinkStartSpy.callCount).to.equal(1);
+					clock.tick(15000);
+					expect(blinkStopSpy.callCount).to.equal(1);
+				});
+
+			blinkStartSpy.restore();
+			blinkStopSpy.restore();
+			clock.restore();
+		});
+	});
+
 	// TODO: add tests for V1 endpoints
 });

test/data/device-api-responses.json

@@ -64,6 +64,11 @@
         "statusCode": 202,
         "body": {},
         "text": "OK"
+      },
+      "/blink": {
+        "statusCode": 200,
+        "body": {},
+        "text": "OK"
       }
     }
   },