fix: path item $ref rendering (#4381)

* WIP: trigger resolution of Path Item $ref on spec load

* fix(dev-server): don't open localhost in a browser

* preserve key order when merging specJson with specResolvedSubtrees

* remove stray `debugger`

test/core/plugins/spec/selectors.js

@@ -1,6 +1,7 @@
 /* eslint-env mocha */
 import expect from "expect"
 import { fromJS } from "immutable"
+import { fromJSOrdered } from "core/utils"
 import {
   parameterValues,
   contentTypeValues,
@@ -9,6 +10,8 @@ import {
   operationConsumes
 } from "corePlugins/spec/selectors"
 
+import Petstore from "./assets/petstore.json"
+
 describe("spec plugin - selectors", function(){
 
   describe("parameterValue", function(){
@@ -311,7 +314,6 @@ describe("spec plugin - selectors", function(){
 
   })
 
-
   describe("specJsonWithResolvedSubtrees", function(){
 
     it("should return a correctly merged tree", function(){
@@ -360,5 +362,93 @@ describe("spec plugin - selectors", function(){
         }
       })
     })
+    it("should preserve initial map key ordering", function(){
+      // Given
+      let state = fromJSOrdered({
+        json: Petstore,
+        resolvedSubtrees: {
+            paths: {
+              "/pet/{petId}": {
+                post: {
+                  tags: [
+                    "pet"
+                  ],
+                  summary: "Updates a pet in the store with form data",
+                  description: "",
+                  operationId: "updatePetWithForm",
+                  consumes: [
+                    "application/x-www-form-urlencoded"
+                  ],
+                  produces: [
+                    "application/xml",
+                    "application/json"
+                  ],
+                  parameters: [
+                    {
+                      name: "petId",
+                      "in": "path",
+                      description: "ID of pet that needs to be updated",
+                      required: true,
+                      type: "integer",
+                      format: "int64"
+                    },
+                    {
+                      name: "name",
+                      "in": "formData",
+                      description: "Updated name of the pet",
+                      required: false,
+                      type: "string"
+                    },
+                    {
+                      name: "status",
+                      "in": "formData",
+                      description: "Updated status of the pet",
+                      required: false,
+                      type: "string"
+                    }
+                  ],
+                  responses: {
+                    "405": {
+                      description: "Invalid input"
+                    }
+                  },
+                  security: [
+                    {
+                      petstore_auth: [
+                        "write:pets",
+                        "read:pets"
+                      ]
+                    }
+                  ],
+                  __originalOperationId: "updatePetWithForm"
+                }
+              }
+            }
+        }
+      })
+
+      // When
+      let result = specJsonWithResolvedSubtrees(state)
+
+      // Then
+      const correctOrder = [
+        "/pet",
+        "/pet/findByStatus",
+        "/pet/findByTags",
+        "/pet/{petId}",
+        "/pet/{petId}/uploadImage",
+        "/store/inventory",
+        "/store/order",
+        "/store/order/{orderId}",
+        "/user",
+        "/user/createWithArray",
+        "/user/createWithList",
+        "/user/login",
+        "/user/logout",
+        "/user/{username}"
+      ]
+      expect(state.getIn(["json", "paths"]).keySeq().toJS()).toEqual(correctOrder)
+      expect(result.getIn(["paths"]).keySeq().toJS()).toEqual(correctOrder)
+    })
   })
 })