Stop attempting to override Accept header in [GitHub] API provider (#7013)

services/github/github-auth-service.spec.js

@@ -0,0 +1,56 @@
+import Joi from 'joi'
+import { expect } from 'chai'
+import sinon from 'sinon'
+import { GithubAuthV3Service } from './github-auth-service.js'
+import GithubApiProvider from './github-api-provider.js'
+
+describe('GithubAuthV3Service', function () {
+  class DummyGithubAuthV3Service extends GithubAuthV3Service {
+    static category = 'build'
+    static route = { base: 'runs' }
+
+    async handle() {
+      const { requiredString } = await this._requestJson({
+        schema: Joi.object({
+          requiredString: Joi.string().required(),
+        }).required(),
+        url: 'https://github-api.example.com/repos/badges/shields/check-runs',
+        options: {
+          headers: {
+            Accept: 'application/vnd.github.antiope-preview+json',
+          },
+        },
+      })
+      return { message: requiredString }
+    }
+  }
+
+  it('forwards custom Accept header', async function () {
+    const sendAndCacheRequestWithCallbacks = sinon.stub().returns(
+      Promise.resolve({
+        buffer: '{"requiredString": "some-string"}',
+        res: { statusCode: 200 },
+      })
+    )
+    const githubApiProvider = new GithubApiProvider({
+      baseUrl: 'https://github-api.example.com',
+    })
+    const mockToken = { update: sinon.mock(), invalidate: sinon.mock() }
+    sinon.stub(githubApiProvider.standardTokens, 'next').returns(mockToken)
+
+    DummyGithubAuthV3Service.invoke({
+      sendAndCacheRequestWithCallbacks,
+      githubApiProvider,
+    })
+
+    expect(sendAndCacheRequestWithCallbacks).to.have.been.calledOnceWith({
+      headers: {
+        'User-Agent': 'Shields.io/2003a',
+        Accept: 'application/vnd.github.antiope-preview+json',
+        Authorization: 'token undefined',
+      },
+      url: 'https://github-api.example.com/repos/badges/shields/check-runs',
+      baseUrl: 'https://github-api.example.com',
+    })
+  })
+})