fix(api): throw hard rejection from api client

api client resolves the promise when request returns error and gives a chance to assert errors, but
in case of hard rejections it will reject the promise

src/ApiClient/Request.js

@@ -36,13 +36,15 @@ class Request {
 
   then (userResolve, userReject) {
     if (!this._fullfilledPromise) {
-      this._fullfilledPromise = new Promise((resolve) => {
+      this._fullfilledPromise = new Promise((resolve, reject) => {
         this.agent.end((error, response) => {
-          if (error) {
-            resolve(new Response(error, this._assert))
-            return
+          if (error && error.response) {
+            resolve(new Response(error.response, true, this._assert))
+          } else if (error) {
+            reject(error)
+          } else {
+            resolve(new Response(response, false, this._assert))
           }
-          resolve(new Response(response, this._assert))
         })
       })
     }

src/ApiClient/Response.js

@@ -12,10 +12,10 @@
 const urlModule = require('url')
 
 class Response {
-  constructor (resOrError, assert) {
+  constructor (res, isError, assert) {
     this._assert = assert
-    this._isError = resOrError.name === 'Error'
-    this._res = this._isError ? resOrError.response : resOrError
+    this._isError = isError
+    this._res = res
   }
 
   get status () {

test/unit/api-client.spec.js

@@ -24,6 +24,22 @@ test.group('Api Client', (group) => {
     this.server.close()
   })
 
+  test('throw error when unable to connect', async (assert) => {
+    assert.plan(1)
+    this.server.on('request', (req, res) => {
+      res.end('yayy')
+    })
+
+    const env = new Env({ TEST_SERVER_URL: 'null:null' })
+    const client = new ApiClient(env, assert)
+    try {
+      const response = await client.get('/')
+      console.log(response)
+    } catch ({ message }) {
+      assert.equal(message, 'getaddrinfo ENOTFOUND null null:80')
+    }
+  })
+
   test('initiate client with new request', async (assert) => {
     this.server.on('request', (req, res) => {
       res.end('yayy')