add specs for crawler service

test/services/crawler.spec.js

@@ -0,0 +1,74 @@
+const chai = require('chai')
+const sinon = require('sinon')
+const { expect } = chai
+const chaiSinon = require('chai-sinon')
+const { mockRequest, setRequestSpy, clearRequestSpy } = require('../../mocks/request.mock')
+
+const crawl = require('../../lib/services/crawler')
+const MockLogger = require('../../mocks/logger.mock')
+
+chai.use(chaiSinon)
+jest.mock('request', () => mockRequest)
+
+describe(crawl, () => {
+  let logger
+  let request
+
+  beforeEach(() => {
+    logger = new MockLogger()
+    clearRequestSpy()
+  })
+
+  it('should return promise', () => {
+    const promise = crawl('https://abc.xyz', { logger })
+
+    expect(promise).to.be.instanceOf(Promise)
+  })
+
+  it('should level log message', (callback) => {
+    logger.on('test:log', ({ message, level, service }) => {
+      expect(message).to.equal('Crawl started for url: https://abc.xyz')
+      expect(level).to.equal('info')
+      expect(service).to.equal('parser')
+      callback()
+    })
+
+    crawl('https://abc.xyz', { logger })
+  })
+
+
+  it('should call request', () => {
+    const spy = setRequestSpy()
+
+    crawl('https://abc.xyz', { logger })
+
+    expect(spy).to.have.been.calledOnce
+  })
+
+
+  it('should call request with URL', () => {
+    const spy = setRequestSpy()
+
+    crawl('https://zzz.yyy', { logger })
+
+    expect(spy.args[0][0].url).to.equal('https://zzz.yyy')
+  })
+
+
+  it('should call request with `Accept-Language` header value', () => {
+    const spy = setRequestSpy()
+
+    crawl('https://zzz.yyy', { logger })
+
+    expect(spy.args[0][0].headers).to.have.property('Accept-Language', 'en-US, en')
+  })
+
+
+  it('should call request with `User-Agent` header value', () => {
+    const spy = setRequestSpy()
+
+    crawl('https://zzz.yyy', { logger })
+
+    expect(spy.args[0][0].headers).to.have.property('User-Agent', 'request')
+  })
+})