diff --git a/__tests__/bundle/commandCanonicalization.test.ts b/__tests__/bundle/commandCanonicalization.test.ts
new file mode 100644
index 0000000..42be15a
--- /dev/null
+++ b/__tests__/bundle/commandCanonicalization.test.ts
@@ -0,0 +1,60 @@
+import type { FakeGithub } from './fakeGithub'
+import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from 'vitest'
+
+import { start } from './fakeGithub'
+import { comment, configReads, helpersFor, repo, token } from './helpers'
+import { runBundle } from './runBundle'
+
+vi.setConfig({ testTimeout: 30_000 })
+
+// the `prow-commands` input's canonicalization in handleIssueComment: a Prow-style alias
+// (/remove-help) names its canonical command's module, duplicates collapse to one run, and
+// a configured name no module serves fails the run
+describe('dist/index.js prow-commands canonicalization', () => {
+  const labelsRead = `GET ${repo}/labels?per_page=100`
+  const labelPost = `POST ${repo}/issues/1/labels`
+  let gh: FakeGithub
+  const { calls, expectRequests } = helpersFor(() => gh)
+
+  beforeAll(async () => {
+    gh = await start()
+  })
+  afterEach(() => gh.reset())
+  afterAll(() => gh.close())
+
+  function routeHelp() {
+    gh.route('GET', `${repo}/labels`, { status: 200, body: [{ name: 'help wanted' }] })
+    gh.route('POST', `${repo}/issues/1/labels`, { status: 200, body: [] })
+  }
+
+  async function run(body: string, commands: string) {
+    return runBundle({
+      eventName: 'issue_comment',
+      payload: comment(body),
+      inputs: { ...token, 'prow-commands': commands },
+      apiUrl: gh.url,
+    })
+  }
+
+  it('a configured /remove-help alias runs the /help module: /help adds help wanted', async () => {
+    routeHelp()
+
+    const result = await run('/help', '/remove-help')
+
+    expect(result.status, result.stdout).toBe(0)
+    expect(result.errors).toEqual([])
+    const posts = gh.requestsMatching('POST', /\/issues\/1\/labels$/)
+    expect(posts).toHaveLength(1)
+    expect(posts[0].body).toEqual({ labels: ['help wanted'] })
+    expectRequests(configReads(), [labelsRead, labelPost])
+  })
+
+  it('a configured command no module serves fails the run naming it and makes no api call', async () => {
+    const result = await run('/foo_bar', '/foo_bar')
+
+    expect(result.status, result.stdout).toBe(1)
+    expect(result.errors).toHaveLength(1)
+    expect(result.errors[0]).toContain('could not execute /foo_bar')
+    expect(calls()).toEqual([])
+  })
+})