diff --git a/__tests__/bundle/closeMilestone.test.ts b/__tests__/bundle/closeMilestone.test.ts
new file mode 100644
index 0000000..966c1ac
--- /dev/null
+++ b/__tests__/bundle/closeMilestone.test.ts
@@ -0,0 +1,80 @@
+import type { FakeGithub } from './fakeGithub'
+import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from 'vitest'
+
+import { start } from './fakeGithub'
+import { comment, helpersFor, repo, token } from './helpers'
+import { runBundle } from './runBundle'
+
+vi.setConfig({ testTimeout: 30_000 })
+
+// the /close and /milestone arms bundle.test.ts does not reach: the plain close and its
+// write failure, and the milestone refusals - driven through dist/index.js
+describe('dist/index.js /close and /milestone', () => {
+  const collaboratorRead = `GET ${repo}/collaborators/Codertocat`
+  const issuePatch = `PATCH ${repo}/issues/1`
+  let gh: FakeGithub
+  const { calls } = helpersFor(() => gh)
+
+  beforeAll(async () => {
+    gh = await start()
+  })
+  afterEach(() => gh.reset())
+  afterAll(() => gh.close())
+
+  function run(body: string, command: string, author?: string) {
+    return runBundle({
+      eventName: 'issue_comment',
+      payload: comment(body, author),
+      inputs: { ...token, 'prow-commands': command },
+      apiUrl: gh.url,
+    })
+  }
+
+  describe('/close', () => {
+    it('whose issue update fails reports the write failure and fails the run', async () => {
+      gh.route('PATCH', `${repo}/issues/1`, { status: 500, body: { message: 'boom' } })
+
+      const result = await run('/close', '/close')
+
+      expect(result.status, result.stdout).toBe(1)
+      expect(result.errors.some(e => e.includes('could not close issue'))).toBe(true)
+      expect(calls()).toEqual([issuePatch])
+      expect(gh.requestsMatching('PATCH', /\/issues\/1$/)[0].body).toEqual({ state: 'closed' })
+    })
+  })
+
+  describe('/milestone', () => {
+    const milestonesRead = `GET ${repo}/milestones`
+
+    it('naming a milestone that does not exist fails listing the available titles and updates nothing', async () => {
+      gh.route('GET', `${repo}/collaborators/Codertocat`, { status: 204 })
+      gh.route('GET', `${repo}/milestones`, { status: 200, body: [{ number: 3, title: 'v1.0' }, { number: 7, title: 'Sprint 2' }] })
+
+      const result = await run('/milestone v9', '/milestone')
+
+      expect(result.status, result.stdout).toBe(1)
+      expect(result.errors.some(e => e.includes('milestone "v9" not found. Available milestones: v1.0, Sprint 2'))).toBe(true)
+      expect(calls()).toEqual([collaboratorRead, milestonesRead])
+    })
+
+    it('with no argument fails asking for a milestone after the collaborator read', async () => {
+      gh.route('GET', `${repo}/collaborators/Codertocat`, { status: 204 })
+
+      const result = await run('/milestone', '/milestone')
+
+      expect(result.status, result.stdout).toBe(1)
+      expect(result.errors.some(e => e.includes('please provide a milestone to add'))).toBe(true)
+      expect(calls()).toEqual([collaboratorRead])
+    })
+
+    it('by a non-collaborator is refused before the milestones are read', async () => {
+      gh.route('GET', `${repo}/collaborators/Codertocat`, { status: 404, body: { message: 'Not Found' } })
+
+      const result = await run('/milestone v1.0', '/milestone')
+
+      expect(result.status, result.stdout).toBe(1)
+      expect(result.errors.some(e => e.includes('commenter is not authorized to set a milestone'))).toBe(true)
+      expect(calls()).toEqual([collaboratorRead])
+    })
+  })
+})