Abstract out fetch (#20)

* pulled fetch out from partial and request

* added tests for fetch.js

Author: raygesualdo

src/partial.js

@@ -1,4 +1,4 @@
-import fetch from 'isomorphic-fetch'
+import fetch from './utilities/fetch'
 import normalize from './utilities/normalize'
 
 /*
@@ -12,12 +12,8 @@ export default (strings, ...vars) => {
   return (strings, ...vars) => {
     let finalData = normalize(strings, vars)
     let mergedOptions = { ...options, ...finalData.options }
+    let finalUrl = finalData.url || url
 
-    return new Promise((resolve, reject) => {
-      fetch(finalData.url || url, mergedOptions)
-      .then(response => response.json())
-      .then(json => resolve(json))
-      .catch(error => reject(error))
-    })
+    return fetch(finalUrl, mergedOptions)
   }
 }

src/request.js

@@ -1,13 +1,8 @@
-import fetch from 'isomorphic-fetch'
+import fetch from './utilities/fetch'
 import normalize from './utilities/normalize'
 
 export default (strings, ...vars) => {
   let { options, url } = normalize(strings, vars)
 
-  return new Promise((resolve, reject) => {
-    fetch(url, options)
-    .then(response => response.json())
-    .then(json => resolve(json))
-    .catch(error => reject(error))
-  })
+  return fetch(url, options)
 }

src/utilities/fetch.js

@@ -0,0 +1,10 @@
+import fetch from 'isomorphic-fetch'
+
+export default (url, options = {}) => {
+  return new Promise((resolve, reject) => {
+    fetch(url, options)
+    .then(response => response.json())
+    .then(json => resolve(json))
+    .catch(error => reject(error))
+  })
+}

tests/unit/fetch.js

@@ -0,0 +1,9 @@
+import fetch from '../../src/utilities/fetch'
+
+describe('fetch', () => {
+  it('returns value from response', async function () {
+    let response = await fetch('https://freegeoip.net/json/github.com')
+
+    expect(response.country_code).to.equal('US')
+  })
+})