fix: mock interceptor should ignore trailing slashes

lib/mock/mock-utils.js

@@ -178,7 +178,12 @@ function deleteMockDispatch (mockDispatches, key) {
 }
 
 function buildKey (opts) {
-  const { path, method, body, headers, query } = opts
+  let { path, method, body, headers, query } = opts
+
+  while (path.length > 1 && path.endsWith('/')) {
+    path = path.slice(0, -1)
+  }
+
   return {
     path,
     method,

test/issue-3649.js

@@ -0,0 +1,78 @@
+'use strict'
+
+const { tspl } = require('@matteo.collina/tspl')
+const { describe, test, beforeEach } = require('node:test')
+const { MockAgent, fetch, setGlobalDispatcher, getGlobalDispatcher } = require('..')
+
+describe('https://github.com/nodejs/undici/issues/3649', () => {
+  const undiciGlobalDispatcher = getGlobalDispatcher()
+  if (!undiciGlobalDispatcher) throw new Error('Could not find the global Undici dispatcher')
+
+  let mockAgent
+
+  beforeEach(() => {
+    mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    setGlobalDispatcher(mockAgent)
+  })
+
+  test('MockAgent should match with or without trailing slash /1', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path', 'https://localhost'))
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /2', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path/', 'https://localhost'))
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /3', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path/' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path', 'https://localhost'))
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /4', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path/' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path/', 'https://localhost'))
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /5', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path////' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path//', 'https://localhost'))
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+})