test(bundle): drive the tide merge gate's missing_labels block and labelMatch wildcards through dist/index.js

__tests__/bundle/mergeGateLabels.test.ts

@@ -0,0 +1,63 @@
+import type { FakeGithub } from './fakeGithub'
+import { Buffer } from 'node:buffer'
+import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it, vi } from 'vitest'
+
+import labelFileContents from '../fixtures/labels/labelFileContentsResp.json'
+import pullReqListPulls from '../fixtures/pullReq/pullReqListPulls.json'
+import pullReqOpenedEvent from '../fixtures/pullReq/pullReqOpenedEvent.json'
+import { start } from './fakeGithub'
+import { configReads, helpersFor, ownersProbe, queueRead, repo, token } from './helpers'
+import { runBundle } from './runBundle'
+
+vi.setConfig({ testTimeout: 30_000 })
+
+// the merge gate's `missing_labels` arm, driven through dist/index.js: the default `do-not-merge/*`
+// family, a configured list whose `*` wildcards sit at either end and in the middle of a pattern,
+// and the documented rule that a configured list replaces the default one instead of extending it
+describe('dist/index.js tide merge gate on missing_labels', () => {
+  let gh: FakeGithub
+  const { expectRequests } = helpersFor(() => gh)
+
+  const head = pullReqOpenedEvent.pull_request.head.sha
+  const bind = `POST ${repo}/statuses/${head}`
+  const pullRead = `GET ${repo}/pulls/1`
+  const labeledLgtm = { ...pullReqOpenedEvent, action: 'labeled', label: { name: 'lgtm' } }
+
+  beforeAll(async () => {
+    gh = await start()
+  })
+  beforeEach(() => gh.mergeQueueFallback({ pullRequestId: 'PR_none', headOid: head, enabled: false }))
+  afterEach(() => gh.reset())
+  afterAll(() => gh.close())
+
+  function routeCleanPr(labels: string[]) {
+    const pr = structuredClone(pullReqListPulls[0])
+    gh.commitStatuses(repo, head, [{ context: 'prow/lgtm', state: 'success' }])
+    gh.route('GET', `${repo}/pulls/1`, { status: 200, body: { ...pr, labels: labels.map(name => ({ name })), mergeable: true, mergeable_state: 'clean', head: { sha: head } } })
+    gh.route('PUT', `${repo}/pulls/1/merge`, { status: 200, body: { merged: true } })
+  }
+
+  function routeTide(yaml: string) {
+    const file = structuredClone(labelFileContents)
+    file.content = Buffer.from(`tide:\n${yaml}`).toString('base64')
+    gh.route('GET', `${repo}/contents/${encodeURIComponent('.github/prow.yaml')}`, { status: 200, body: file })
+  }
+
+  function run() {
+    return runBundle({ eventName: 'pull_request', payload: labeledLgtm, inputs: { ...token, 'merge-method': 'squash' }, apiUrl: gh.url })
+  }
+
+  it('a configured pattern with wildcards at both ends and in the middle blocks the label it matches', async () => {
+    // `*-wip` fails on the suffix and `*wip*` has to find its middle part between the empty anchors
+    routeTide('  missing_labels: ["do-not-merge/*", "*-wip", "*wip*"]\n')
+    routeCleanPr(['lgtm', 'wip-docs'])
+
+    const result = await run()
+
+    expect(result.status, result.stdout).toBe(0)
+    expect(result.errors).toEqual([])
+    expect(result.stdout).toContain('skipping pr #1: blocked by wip-docs')
+    expect(gh.requestsMatching('PUT', /./)).toEqual([])
+    expectRequests(configReads({ repo: '.github/prow.yaml' }), [bind, pullRead, ownersProbe, queueRead])
+  })
+})