Override superagent's _saveCookies method to fix jest weird set-cooki…

…e behavior

See ladjs#413 and jestjs/jest#3547

lib/agent.js

@@ -40,6 +40,24 @@ function TestAgent(app, options) {
 
 TestAgent.prototype.__proto__ = Agent.prototype;
 
+/**
+ * Override superagent's _saveCookies method
+ * to fix jest weird set-cookie behavior
+ * (https://github.com/facebook/jest/issues/3547)
+ *
+ * @param {Response} res
+ * @api private
+ */
+TestAgent.prototype._saveCookies = function(res) {
+  var cookies = res.headers['set-cookie'];
+  if (cookies) {
+    cookies = cookies.reduce(function(cookies, cookie) {
+      return cookies.concat(cookie.split(/,(?!\s)/));
+    }, []);
+    this.jar.setCookies(cookies);
+  }
+};
+
 // override HTTP verb methods
 methods.forEach(function(method) {
   TestAgent.prototype[method] = function(url, fn) {   // eslint-disable-line no-unused-vars