Improve test to cover body

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

@@ -5,6 +5,7 @@ import {
   BasicRestAuthConfig,
   BearerRestAuthConfig,
   BodyType,
+  OAuth2CredentialsMethod,
   RestAuthType,
 } from "@budibase/types"
 import { Response } from "node-fetch"
@@ -276,20 +277,30 @@ describe("REST Integration", () => {
       expect(data).toEqual({ foo: "bar" })
     })
 
-    it("adds OAuth2 auth", async () => {
+    it("adds OAuth2 auth (via body)", async () => {
       const oauth2Url = generator.url()
+      const secret = generator.hash()
       const { config: oauthConfig } = await config.api.oauth2.create({
         name: generator.guid(),
         url: oauth2Url,
         clientId: generator.guid(),
-        clientSecret: generator.hash(),
+        clientSecret: secret,
+        method: OAuth2CredentialsMethod.HEADER,
       })
 
       const token = generator.guid()
 
       const url = new URL(oauth2Url)
-      nock(url.origin)
-        .post(url.pathname)
+      nock(url.origin, {
+        reqheaders: {
+          "content-Type": "application/x-www-form-urlencoded",
+        },
+      })
+        .post(url.pathname, {
+          grant_type: "client_credentials",
+          client_id: oauthConfig.clientId,
+          client_secret: secret,
+        })
         .reply(200, { token_type: "Bearer", access_token: token })
 
       nock("https://example.com", {