feat: create authenticate helper

package.json

@@ -28,6 +28,7 @@
     "@babel/plugin-external-helpers": "^7.2.0",
     "@babel/plugin-proposal-object-rest-spread": "^7.2.0",
     "@babel/preset-env": "^7.2.0",
+    "axios-mock-adapter": "^1.15.0",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^23.6.0",
     "coveralls": "^3.0.2",

src/helpers/authenticate.js

@@ -8,8 +8,8 @@ const authenticate = async ({ clientId, clientPassword }) => {
     const reqAuth = { username: clientId, password: clientPassword }
     const { data } = await axios.post(reqUrl, qs.stringify(reqData), { auth: reqAuth })
     return data.access_token
-  } catch (err) {
-    return Promise.reject(new Error(err))
+  } catch (e) {
+    return Promise.reject(new Error(e))
   }
 }
 

test/authenticate.spec.js

@@ -1,5 +1,24 @@
+import axios from 'axios'
+import MockAdapter from 'axios-mock-adapter'
+
 import authenticate from '../src/helpers/authenticate'
 
-describe('authenticate', async () => {
-  it('should fetch an access token', async () => {})
+const mock = new MockAdapter(axios)
+
+const url = 'https://account.demandware.com/dw/oauth2/access_token'
+const credentials = { clientId: 'test', clientPassword: 'test' }
+
+describe('authenticate', () => {
+  it('should fetch an access token', async () => {
+    expect.assertions(1)
+    const mockResponse = { access_token: 'token' }
+    mock.onPost(url).reply(200, mockResponse)
+    await expect(authenticate(credentials)).resolves.toEqual(mockResponse.access_token)
+  })
+
+  it('should fails with an error', async () => {
+    expect.assertions(1)
+    mock.onPost(url).networkError()
+    await expect(authenticate(credentials)).rejects.toThrow()
+  })
 })