A patch to `node-fetch` to cause random errors

fetch-random-error.patch

--- node_modules/node-fetch/lib/index.js	2018-03-25 13:54:59.000000000 -0700
+++ node_modules/node-fetch/lib/index.patched.js	2018-05-23 13:51:07.000000000 -0700
@@ -249,6 +249,9 @@
 
 		return consumeBody.call(this).then(function (buffer) {
 			try {
+        if(Math.random() < 0.1) {
+				  return Body.Promise.reject(new FetchError('random error raised as a test'));
+        }
 				return JSON.parse(buffer.toString());
 			} catch (err) {
 				return Body.Promise.reject(new FetchError(`invalid json response body at ${_this2.url} reason: ${err.message}`, 'invalid-json'));
@@ -1361,6 +1364,10 @@
 		throw new Error('native promise missing, set fetch.Promise to your favorite alternative');
 	}
 
+  if(Math.random() < 0.1) {
+    throw new Error('random error raised as a test');
+  }
+
 	Body.Promise = fetch.Promise;
 
 	// wrap http.request into fetch