Updating mocks.

packages/server/__mocks__/node-fetch.ts

@@ -6,6 +6,9 @@ module FetchMock {
       return {
         status,
         headers: {
+          raw: () => {
+            return { "content-type": ["application/json"] }
+          },
           get: () => {
             return ["application/json"]
           },

packages/server/src/integrations/tests/rest.spec.js

@@ -1,6 +1,9 @@
 jest.mock("node-fetch", () =>
   jest.fn(() => ({
     headers: {
+      raw: () => {
+        return { "content-type": ["application/json"] }
+      },
       get: () => ["application/json"]
     },
     json: jest.fn(),