Add parse json body to response object

`runAction` exposes a `Response` object in its callback.

The old `request` library had a slightly different interface than the
one for the `Response` object for `node-fetch`.

Specifically, both have `body` defined by `request` had `body` as the
parsed json body. Add the parsed json body to the `Response` object
returned by runAction. `body` has no `setter` and only a `getter` so a
new object needs to be created instead.

lib/run_action.js

@@ -66,8 +66,15 @@ function runAction(base, method, path, queryParams, bodyData, callback, numAttem
                 resp.json()
                     .then(function(body) {
                         var error = base._checkStatusForError(resp.status, body);
-                        resp.statusCode = resp.status;
-                        callback(error, resp, body);
+                        // Ensure Response interface matches interface from
+                        // `request` Response object
+                        var r = {};
+                        Object.keys(resp).forEach(function(property) {
+                            r[property] = resp[property];
+                        });
+                        r.body = body;
+                        r.statusCode = resp.status;
+                        callback(error, r, body);
                     })
                     .catch(function() {
                         callback(base._checkStatusForError(resp.status));

test/base.test.js

@@ -539,6 +539,21 @@ describe('Base', function() {
             });
         });
 
+        it('exposes the body of the request directly on the response', function(done) {
+            testExpressApp.set('handler override', function(req, res) {
+                res.json({
+                    fizz: 'buzz',
+                });
+            });
+
+            fakeBase.runAction('get', '/', {}, null, function(err, res, body) {
+                expect(err).toBeNull();
+                expect(res.body.fizz).toBe('buzz');
+                expect(body.fizz).toBe('buzz');
+                done();
+            });
+        });
+
         it('makes requests GET requests with empty bodies', function(done) {
             expect(version).toEqual(expect.stringMatching(/^\d+\.\d+\.\d+$/));