fix(fetchtool): catch fetch exception on get resource (#1)

src/FetchTool.js

@@ -20,7 +20,10 @@ class FetchTool {
      */
     get ({url, ...options}) {
         return fetch(url, Object.assign({method: 'GET'}, options))
-            .then(result => result.arrayBuffer())
+            .then(result => {
+                if (result.ok) return result.arrayBuffer();
+                return Promise.reject(result.status);
+            })
             .then(body => new Uint8Array(body));
     }
 

test/unit/fetch-tool.js

@@ -1,4 +1,6 @@
 const test = require('tap').test;
+const TextEncoder = require('util').TextEncoder;
+const TextDecoder = require('util').TextDecoder;
 
 const FetchTool = require('../../src/FetchTool');
 
@@ -27,3 +29,34 @@ test('send failure returns response.status', t => {
         t.equal(reason, 500);
     });
 });
+
+test('get success returns Uint8Array.body(response.arrayBuffer())', t => {
+    const text = 'successful response';
+    const encoding = 'utf-8';
+    const encoded = new TextEncoder().encode(text);
+    const decoder = new TextDecoder(encoding);
+
+    global.fetch = () => Promise.resolve({
+        ok: true,
+        arrayBuffer: () => encoded.buffer
+    });
+
+    const tool = new FetchTool();
+
+    return tool.get({url: 'url'}).then(result => {
+        t.equal(decoder.decode(result), text);
+    });
+});
+
+test('get failure returns response.status', t => {
+    global.fetch = () => Promise.resolve({
+        ok: false,
+        status: 500
+    });
+
+    const tool = new FetchTool();
+
+    return tool.get({url: 'url'}).catch(reason => {
+        t.equal(reason, 500);
+    });
+});