test(bundle): drive the 'could not list the repository labels' arms of labelIssue and label-sync through dist/index.js

__tests__/bundle/labelListingRefused.test.ts

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+import type { FakeGithub } from './fakeGithub'
+import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from 'vitest'
+
+import labelFileContents from '../fixtures/labels/labelFileContentsResp.json'
+import { start } from './fakeGithub'
+import { comment, configReads, helpersFor, repo, token } from './helpers'
+import { runBundle } from './runBundle'
+
+vi.setConfig({ testTimeout: 30_000 })
+
+// the read of the repository's label catalog that both the label commands and the label-sync job make
+const labelsRead = `GET ${repo}/labels?per_page=100`
+
+// the `could not list the repository labels` arms: assertLabelsExist (src/utils/labeling.ts, via labelIssue)
+// and labelSync (src/cronJobs/labelSync.ts) each wrap the catalog read and rethrow when it fails. Every
+// other bundle test routes `GET /labels` to 200, so neither arm was reachable before.
+describe('dist/index.js label catalog read refused', () => {
+  let gh: FakeGithub
+  const { expectRequests } = helpersFor(() => gh)
+
+  beforeAll(async () => {
+    gh = await start()
+  })
+  afterEach(() => gh.reset())
+  afterAll(() => gh.close())
+
+  it('/kind fails the run naming the refused label listing and never writes', async () => {
+    gh.route('GET', `${repo}/contents/.prowlabels.yaml`, { status: 200, body: labelFileContents })
+    gh.route('GET', `${repo}/labels`, { status: 500, body: { message: 'boom' } })
+
+    const result = await runBundle({
+      eventName: 'issue_comment',
+      payload: comment('/kind cleanup'),
+      inputs: { ...token, 'prow-commands': '/kind' },
+      apiUrl: gh.url,
+    })
+
+    expect(result.status, result.stdout).toBe(1)
+    expect(result.errors).toHaveLength(1)
+    expect(result.errors[0]).toContain('error handling issue comment: Error: could not list the repository labels: HttpError: boom')
+    expect(gh.requestsMatching('POST', /./)).toHaveLength(0)
+    expectRequests([...configReads({ repo: '.prowlabels.yaml' }), labelsRead], [])
+  })
+
+  it('label-sync fails the run naming the refused label listing before planning any write', async () => {
+    gh.route('GET', `${repo}/labels`, { status: 500, body: { message: 'boom' } })
+
+    const result = await runBundle({
+      eventName: 'workflow_dispatch',
+      payload: {},
+      inputs: { ...token, jobs: 'label-sync' },
+      apiUrl: gh.url,
+    })
+
+    expect(result.status, result.stdout).toBe(1)
+    expect(result.errors).toHaveLength(1)
+    expect(result.errors[0]).toContain('error handling cron job: Error: could not list the repository labels: HttpError: boom')
+    expect(gh.requestsMatching('POST', /./)).toHaveLength(0)
+    expect(gh.requestsMatching('PATCH', /./)).toHaveLength(0)
+    expectRequests([...configReads(), labelsRead], [])
+  })
+})