From 10cf8adc76a313f6375bdd9b9a770f2b766b886e Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Tue, 1 Oct 2024 01:10:57 +0200
Subject: [PATCH 1/8] fix: mock interceptor should ignore trailing slashes

---
 lib/mock/mock-utils.js |  11 ++++-
 test/issue-3649.js     | 102 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+), 1 deletion(-)
 create mode 100644 test/issue-3649.js

diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index 56be2c8a06e..5e89397c684 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -178,7 +178,16 @@ function deleteMockDispatch (mockDispatches, key) {
 }
 
 function buildKey (opts) {
-  const { path, method, body, headers, query } = opts
+  let { path, method, body, headers, query } = opts
+
+  while (path.endsWith('/')) {
+    path = path.slice(0, -1)
+  }
+
+  if (path.length === 0) {
+    path = '/'
+  }
+
   return {
     path,
     method,
diff --git a/test/issue-3649.js b/test/issue-3649.js
new file mode 100644
index 00000000000..2daa6f6cb0a
--- /dev/null
+++ b/test/issue-3649.js
@@ -0,0 +1,102 @@
+'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 })
+  })
+
+  test('MockAgent should match with or without trailing slash /6', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('', 'https://localhost'))
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /7', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/', 'https://localhost'))
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+})

From b58016c26e2cb607edb37d48d29a96b814889cf7 Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Tue, 1 Oct 2024 01:19:45 +0200
Subject: [PATCH 2/8] only normalize path if it is a string

---
 lib/mock/mock-utils.js | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index 5e89397c684..c5512845970 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -180,12 +180,15 @@ function deleteMockDispatch (mockDispatches, key) {
 function buildKey (opts) {
   let { path, method, body, headers, query } = opts
 
-  while (path.endsWith('/')) {
-    path = path.slice(0, -1)
-  }
+  // normalize path if it is a string
+  if (typeof path === 'string') {
+    while (path.endsWith('/')) {
+      path = path.slice(0, -1)
+    }
 
-  if (path.length === 0) {
-    path = '/'
+    if (path.length === 0) {
+      path = '/'
+    }
   }
 
   return {

From 809df7629b6e088bf90dc42fa5bc5ee159d62167 Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Tue, 1 Oct 2024 01:30:24 +0200
Subject: [PATCH 3/8] put tests into mock-interceptors.js

---
 test/issue-3649.js       | 102 --------------------------------------
 test/mock-interceptor.js | 103 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 102 insertions(+), 103 deletions(-)
 delete mode 100644 test/issue-3649.js

diff --git a/test/issue-3649.js b/test/issue-3649.js
deleted file mode 100644
index 2daa6f6cb0a..00000000000
--- a/test/issue-3649.js
+++ /dev/null
@@ -1,102 +0,0 @@
-'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 })
-  })
-
-  test('MockAgent should match with or without trailing slash /6', async (t) => {
-    t = tspl(t, { plan: 1 })
-
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '/' }).reply(200, { ok: true })
-
-    const res = await fetch(new URL('', 'https://localhost'))
-
-    t.deepStrictEqual(await res.json(), { ok: true })
-  })
-
-  test('MockAgent should match with or without trailing slash /7', async (t) => {
-    t = tspl(t, { plan: 1 })
-
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '' }).reply(200, { ok: true })
-
-    const res = await fetch(new URL('/', 'https://localhost'))
-
-    t.deepStrictEqual(await res.json(), { ok: true })
-  })
-})
diff --git a/test/mock-interceptor.js b/test/mock-interceptor.js
index 0d16290f579..bcd8ab4dd7a 100644
--- a/test/mock-interceptor.js
+++ b/test/mock-interceptor.js
@@ -6,6 +6,7 @@ const { MockInterceptor, MockScope } = require('../lib/mock/mock-interceptor')
 const MockAgent = require('../lib/mock/mock-agent')
 const { kDispatchKey } = require('../lib/mock/mock-symbols')
 const { InvalidArgumentError } = require('../lib/core/errors')
+const { fetch } = require('../lib/web/fetch/index')
 
 describe('MockInterceptor - path', () => {
   test('should remove hash fragment from paths', t => {
@@ -14,7 +15,7 @@ describe('MockInterceptor - path', () => {
       path: '#foobar',
       method: ''
     }, [])
-    t.strictEqual(mockInterceptor[kDispatchKey].path, '')
+    t.strictEqual(mockInterceptor[kDispatchKey].path, '/')
   })
 })
 
@@ -257,3 +258,103 @@ describe('MockInterceptor - replyContentLength', () => {
     t.ok(result instanceof MockInterceptor)
   })
 })
+
+describe('https://github.com/nodejs/undici/issues/3649', () => {
+  test('MockAgent should match with or without trailing slash /1', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    const mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path', 'https://localhost'), { dispatcher: mockAgent })
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /2', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    const mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path/', 'https://localhost'), { dispatcher: mockAgent })
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /3', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    const mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path/' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path', 'https://localhost'), { dispatcher: mockAgent })
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /4', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    const mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path/' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path/', 'https://localhost'), { dispatcher: mockAgent })
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /5', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    const mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/api/some-path////' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/api/some-path//', 'https://localhost'), { dispatcher: mockAgent })
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /6', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    const mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '/' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('', 'https://localhost'), { dispatcher: mockAgent })
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+
+  test('MockAgent should match with or without trailing slash /7', async (t) => {
+    t = tspl(t, { plan: 1 })
+
+    const mockAgent = new MockAgent()
+    mockAgent.disableNetConnect()
+    mockAgent
+      .get('https://localhost')
+      .intercept({ path: '' }).reply(200, { ok: true })
+
+    const res = await fetch(new URL('/', 'https://localhost'), { dispatcher: mockAgent })
+
+    t.deepStrictEqual(await res.json(), { ok: true })
+  })
+})

From 729a2ad9ed90b6f3c0dbdb046b6caba380bea0ab Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Wed, 2 Oct 2024 21:10:59 +0200
Subject: [PATCH 4/8] make ignoreTrailingSlashes an option of MockAgent

---
 lib/mock/mock-client.js  |   9 +++-
 lib/mock/mock-pool.js    |   9 +++-
 lib/mock/mock-symbols.js |   3 +-
 lib/mock/mock-utils.js   |   9 ++--
 test/mock-interceptor.js | 102 +++++++++------------------------------
 types/mock-agent.d.ts    |   3 ++
 6 files changed, 46 insertions(+), 89 deletions(-)

diff --git a/lib/mock/mock-client.js b/lib/mock/mock-client.js
index fd840fba908..80afd97b868 100644
--- a/lib/mock/mock-client.js
+++ b/lib/mock/mock-client.js
@@ -10,7 +10,8 @@ const {
   kOriginalClose,
   kOrigin,
   kOriginalDispatch,
-  kConnected
+  kConnected,
+  kIgnoreTrailingSlashes
 } = require('./mock-symbols')
 const { MockInterceptor } = require('./mock-interceptor')
 const Symbols = require('../core/symbols')
@@ -29,6 +30,7 @@ class MockClient extends Client {
 
     this[kMockAgent] = opts.agent
     this[kOrigin] = origin
+    this[kIgnoreTrailingSlashes] = opts.ignoreTrailingSlashes ?? false
     this[kDispatches] = []
     this[kConnected] = 1
     this[kOriginalDispatch] = this.dispatch
@@ -46,7 +48,10 @@ class MockClient extends Client {
    * Sets up the base interceptor for mocking replies from undici.
    */
   intercept (opts) {
-    return new MockInterceptor(opts, this[kDispatches])
+    return new MockInterceptor(
+      opts && { ignoreTrailingSlashes: this[kIgnoreTrailingSlashes], ...opts },
+      this[kDispatches]
+    )
   }
 
   async [kClose] () {
diff --git a/lib/mock/mock-pool.js b/lib/mock/mock-pool.js
index bc68a37faa3..95b6525e536 100644
--- a/lib/mock/mock-pool.js
+++ b/lib/mock/mock-pool.js
@@ -10,7 +10,8 @@ const {
   kOriginalClose,
   kOrigin,
   kOriginalDispatch,
-  kConnected
+  kConnected,
+  kIgnoreTrailingSlashes
 } = require('./mock-symbols')
 const { MockInterceptor } = require('./mock-interceptor')
 const Symbols = require('../core/symbols')
@@ -29,6 +30,7 @@ class MockPool extends Pool {
 
     this[kMockAgent] = opts.agent
     this[kOrigin] = origin
+    this[kIgnoreTrailingSlashes] = opts.ignoreTrailingSlashes ?? false
     this[kDispatches] = []
     this[kConnected] = 1
     this[kOriginalDispatch] = this.dispatch
@@ -46,7 +48,10 @@ class MockPool extends Pool {
    * Sets up the base interceptor for mocking replies from undici.
    */
   intercept (opts) {
-    return new MockInterceptor(opts, this[kDispatches])
+    return new MockInterceptor(
+      opts && { ignoreTrailingSlashes: this[kIgnoreTrailingSlashes], ...opts },
+      this[kDispatches]
+    )
   }
 
   async [kClose] () {
diff --git a/lib/mock/mock-symbols.js b/lib/mock/mock-symbols.js
index 2a8336b75f3..32449e9f36e 100644
--- a/lib/mock/mock-symbols.js
+++ b/lib/mock/mock-symbols.js
@@ -20,5 +20,6 @@ module.exports = {
   kIsMockActive: Symbol('is mock active'),
   kNetConnect: Symbol('net connect'),
   kGetNetConnect: Symbol('get net connect'),
-  kConnected: Symbol('connected')
+  kConnected: Symbol('connected'),
+  kIgnoreTrailingSlashes: Symbol('ignore trailing slashes')
 }
diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index 7b434f2d938..9fafa7c1b63 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -6,7 +6,8 @@ const {
   kMockAgent,
   kOriginalDispatch,
   kOrigin,
-  kGetNetConnect
+  kGetNetConnect,
+  kIgnoreTrailingSlashes
 } = require('./mock-symbols')
 const { serializePathWithQuery } = require('../core/util')
 const { STATUS_CODES } = require('node:http')
@@ -182,10 +183,10 @@ function deleteMockDispatch (mockDispatches, key) {
 }
 
 function buildKey (opts) {
-  let { path, method, body, headers, query } = opts
+  let { path, method, body, headers, query, ignoreTrailingSlashes = false } = opts
 
   // normalize path if it is a string
-  if (typeof path === 'string') {
+  if (ignoreTrailingSlashes && typeof path === 'string') {
     while (path.endsWith('/')) {
       path = path.slice(0, -1)
     }
@@ -243,7 +244,7 @@ async function getResponse (body) {
  */
 function mockDispatch (opts, handler) {
   // Get mock dispatch from built key
-  const key = buildKey(opts)
+  const key = buildKey({ ignoreTrailingSlashes: this[kIgnoreTrailingSlashes], ...opts })
   const mockDispatch = getMockDispatch(this[kDispatches], key)
 
   mockDispatch.timesInvoked++
diff --git a/test/mock-interceptor.js b/test/mock-interceptor.js
index fa0723f5abc..4c2936f3b42 100644
--- a/test/mock-interceptor.js
+++ b/test/mock-interceptor.js
@@ -15,7 +15,7 @@ describe('MockInterceptor - path', () => {
       path: '#foobar',
       method: ''
     }, [])
-    t.strictEqual(mockInterceptor[kDispatchKey].path, '/')
+    t.strictEqual(mockInterceptor[kDispatchKey].path, '')
   })
 })
 
@@ -260,74 +260,30 @@ describe('MockInterceptor - replyContentLength', () => {
 })
 
 describe('https://github.com/nodejs/undici/issues/3649', () => {
-  test('MockAgent should match with or without trailing slash /1', async (t) => {
-    t = tspl(t, { plan: 1 })
-
-    const mockAgent = new MockAgent()
-    mockAgent.disableNetConnect()
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '/api/some-path' }).reply(200, { ok: true })
-
-    const res = await fetch(new URL('/api/some-path', 'https://localhost'), { dispatcher: mockAgent })
-
-    t.deepStrictEqual(await res.json(), { ok: true })
-  })
-
-  test('MockAgent should match with or without trailing slash /2', async (t) => {
-    t = tspl(t, { plan: 1 })
-
-    const mockAgent = new MockAgent()
-    mockAgent.disableNetConnect()
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '/api/some-path' }).reply(200, { ok: true })
-
-    const res = await fetch(new URL('/api/some-path/', 'https://localhost'), { dispatcher: mockAgent })
-
-    t.deepStrictEqual(await res.json(), { ok: true })
-  })
-
-  test('MockAgent should match with or without trailing slash /3', async (t) => {
-    t = tspl(t, { plan: 1 })
-
-    const mockAgent = new MockAgent()
-    mockAgent.disableNetConnect()
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '/api/some-path/' }).reply(200, { ok: true })
-
-    const res = await fetch(new URL('/api/some-path', 'https://localhost'), { dispatcher: mockAgent })
-
-    t.deepStrictEqual(await res.json(), { ok: true })
-  })
-
-  test('MockAgent should match with or without trailing slash /4', async (t) => {
-    t = tspl(t, { plan: 1 })
-
-    const mockAgent = new MockAgent()
-    mockAgent.disableNetConnect()
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '/api/some-path/' }).reply(200, { ok: true })
-
-    const res = await fetch(new URL('/api/some-path/', 'https://localhost'), { dispatcher: mockAgent })
-
-    t.deepStrictEqual(await res.json(), { ok: true })
-  })
-
-  test('MockAgent should match with or without trailing slash /5', async (t) => {
-    t = tspl(t, { plan: 1 })
+  [
+    ['/api/some-path', '/api/some-path'],
+    ['/api/some-path/', '/api/some-path'],
+    ['/api/some-path', '/api/some-path/'],
+    ['/api/some-path/', '/api/some-path/'],
+    ['/api/some-path////', '/api/some-path//'],
+    ['', ''],
+    ['/', ''],
+    ['', '/'],
+    ['/', '/']
+  ].forEach(([interceptPath, fetchedPath], index) => {
+    test(`MockAgent should match with or without trailing slash by setting ignoreTrailingSlashes as MockAgent option /${index}`, async (t) => {
+      t = tspl(t, { plan: 1 })
 
-    const mockAgent = new MockAgent()
-    mockAgent.disableNetConnect()
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '/api/some-path////' }).reply(200, { ok: true })
+      const mockAgent = new MockAgent({ ignoreTrailingSlashes: true })
+      mockAgent.disableNetConnect()
+      mockAgent
+        .get('https://localhost')
+        .intercept({ path: interceptPath }).reply(200, { ok: true })
 
-    const res = await fetch(new URL('/api/some-path//', 'https://localhost'), { dispatcher: mockAgent })
+      const res = await fetch(new URL(fetchedPath, 'https://localhost'), { dispatcher: mockAgent })
 
-    t.deepStrictEqual(await res.json(), { ok: true })
+      t.deepStrictEqual(await res.json(), { ok: true })
+    })
   })
 
   test('MockAgent should match with or without trailing slash /6', async (t) => {
@@ -343,20 +299,6 @@ describe('https://github.com/nodejs/undici/issues/3649', () => {
 
     t.deepStrictEqual(await res.json(), { ok: true })
   })
-
-  test('MockAgent should match with or without trailing slash /7', async (t) => {
-    t = tspl(t, { plan: 1 })
-
-    const mockAgent = new MockAgent()
-    mockAgent.disableNetConnect()
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '' }).reply(200, { ok: true })
-
-    const res = await fetch(new URL('/', 'https://localhost'), { dispatcher: mockAgent })
-
-    t.deepStrictEqual(await res.json(), { ok: true })
-  })
 })
 
 describe('MockInterceptor - different payloads', () => {
diff --git a/types/mock-agent.d.ts b/types/mock-agent.d.ts
index da40a43b744..26733eb4914 100644
--- a/types/mock-agent.d.ts
+++ b/types/mock-agent.d.ts
@@ -46,5 +46,8 @@ declare namespace MockAgent {
   export interface Options extends Agent.Options {
     /** A custom agent to be encapsulated by the MockAgent. */
     agent?: Dispatcher;
+
+    /** Ignore trailing slashes in the path */
+    ignoreTrailingSlashes?: boolean;
   }
 }

From 8c268efe84ba658e17aaaf464ddd5fd21eb7518e Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Wed, 2 Oct 2024 21:19:32 +0200
Subject: [PATCH 5/8] rename to ignoreTrailingSlash

---
 lib/mock/mock-client.js  | 6 +++---
 lib/mock/mock-pool.js    | 6 +++---
 lib/mock/mock-symbols.js | 2 +-
 lib/mock/mock-utils.js   | 8 ++++----
 test/mock-interceptor.js | 4 ++--
 types/mock-agent.d.ts    | 2 +-
 6 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/lib/mock/mock-client.js b/lib/mock/mock-client.js
index 80afd97b868..f8a786ced8b 100644
--- a/lib/mock/mock-client.js
+++ b/lib/mock/mock-client.js
@@ -11,7 +11,7 @@ const {
   kOrigin,
   kOriginalDispatch,
   kConnected,
-  kIgnoreTrailingSlashes
+  kIgnoreTrailingSlash
 } = require('./mock-symbols')
 const { MockInterceptor } = require('./mock-interceptor')
 const Symbols = require('../core/symbols')
@@ -30,7 +30,7 @@ class MockClient extends Client {
 
     this[kMockAgent] = opts.agent
     this[kOrigin] = origin
-    this[kIgnoreTrailingSlashes] = opts.ignoreTrailingSlashes ?? false
+    this[kIgnoreTrailingSlash] = opts.ignoreTrailingSlash ?? false
     this[kDispatches] = []
     this[kConnected] = 1
     this[kOriginalDispatch] = this.dispatch
@@ -49,7 +49,7 @@ class MockClient extends Client {
    */
   intercept (opts) {
     return new MockInterceptor(
-      opts && { ignoreTrailingSlashes: this[kIgnoreTrailingSlashes], ...opts },
+      opts && { ignoreTrailingSlash: this[kIgnoreTrailingSlash], ...opts },
       this[kDispatches]
     )
   }
diff --git a/lib/mock/mock-pool.js b/lib/mock/mock-pool.js
index 95b6525e536..a266211ac70 100644
--- a/lib/mock/mock-pool.js
+++ b/lib/mock/mock-pool.js
@@ -11,7 +11,7 @@ const {
   kOrigin,
   kOriginalDispatch,
   kConnected,
-  kIgnoreTrailingSlashes
+  kIgnoreTrailingSlash
 } = require('./mock-symbols')
 const { MockInterceptor } = require('./mock-interceptor')
 const Symbols = require('../core/symbols')
@@ -30,7 +30,7 @@ class MockPool extends Pool {
 
     this[kMockAgent] = opts.agent
     this[kOrigin] = origin
-    this[kIgnoreTrailingSlashes] = opts.ignoreTrailingSlashes ?? false
+    this[kIgnoreTrailingSlash] = opts.ignoreTrailingSlash ?? false
     this[kDispatches] = []
     this[kConnected] = 1
     this[kOriginalDispatch] = this.dispatch
@@ -49,7 +49,7 @@ class MockPool extends Pool {
    */
   intercept (opts) {
     return new MockInterceptor(
-      opts && { ignoreTrailingSlashes: this[kIgnoreTrailingSlashes], ...opts },
+      opts && { ignoreTrailingSlash: this[kIgnoreTrailingSlash], ...opts },
       this[kDispatches]
     )
   }
diff --git a/lib/mock/mock-symbols.js b/lib/mock/mock-symbols.js
index 32449e9f36e..492edddabf5 100644
--- a/lib/mock/mock-symbols.js
+++ b/lib/mock/mock-symbols.js
@@ -21,5 +21,5 @@ module.exports = {
   kNetConnect: Symbol('net connect'),
   kGetNetConnect: Symbol('get net connect'),
   kConnected: Symbol('connected'),
-  kIgnoreTrailingSlashes: Symbol('ignore trailing slashes')
+  kIgnoreTrailingSlash: Symbol('ignore trailing slash')
 }
diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index 9fafa7c1b63..2096957f388 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -7,7 +7,7 @@ const {
   kOriginalDispatch,
   kOrigin,
   kGetNetConnect,
-  kIgnoreTrailingSlashes
+  kIgnoreTrailingSlash
 } = require('./mock-symbols')
 const { serializePathWithQuery } = require('../core/util')
 const { STATUS_CODES } = require('node:http')
@@ -183,10 +183,10 @@ function deleteMockDispatch (mockDispatches, key) {
 }
 
 function buildKey (opts) {
-  let { path, method, body, headers, query, ignoreTrailingSlashes = false } = opts
+  let { path, method, body, headers, query, ignoreTrailingSlash = false } = opts
 
   // normalize path if it is a string
-  if (ignoreTrailingSlashes && typeof path === 'string') {
+  if (ignoreTrailingSlash && typeof path === 'string') {
     while (path.endsWith('/')) {
       path = path.slice(0, -1)
     }
@@ -244,7 +244,7 @@ async function getResponse (body) {
  */
 function mockDispatch (opts, handler) {
   // Get mock dispatch from built key
-  const key = buildKey({ ignoreTrailingSlashes: this[kIgnoreTrailingSlashes], ...opts })
+  const key = buildKey({ ignoreTrailingSlash: this[kIgnoreTrailingSlash], ...opts })
   const mockDispatch = getMockDispatch(this[kDispatches], key)
 
   mockDispatch.timesInvoked++
diff --git a/test/mock-interceptor.js b/test/mock-interceptor.js
index 4c2936f3b42..ceda8f2e908 100644
--- a/test/mock-interceptor.js
+++ b/test/mock-interceptor.js
@@ -271,10 +271,10 @@ describe('https://github.com/nodejs/undici/issues/3649', () => {
     ['', '/'],
     ['/', '/']
   ].forEach(([interceptPath, fetchedPath], index) => {
-    test(`MockAgent should match with or without trailing slash by setting ignoreTrailingSlashes as MockAgent option /${index}`, async (t) => {
+    test(`MockAgent should match with or without trailing slash by setting ignoreTrailingSlash as MockAgent option /${index}`, async (t) => {
       t = tspl(t, { plan: 1 })
 
-      const mockAgent = new MockAgent({ ignoreTrailingSlashes: true })
+      const mockAgent = new MockAgent({ ignoreTrailingSlash: true })
       mockAgent.disableNetConnect()
       mockAgent
         .get('https://localhost')
diff --git a/types/mock-agent.d.ts b/types/mock-agent.d.ts
index 26733eb4914..311b28b2db0 100644
--- a/types/mock-agent.d.ts
+++ b/types/mock-agent.d.ts
@@ -48,6 +48,6 @@ declare namespace MockAgent {
     agent?: Dispatcher;
 
     /** Ignore trailing slashes in the path */
-    ignoreTrailingSlashes?: boolean;
+    ignoreTrailingSlash?: boolean;
   }
 }

From 7cd005e86dbb121ca5bcf07c461f58c01151d4ab Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Thu, 3 Oct 2024 11:01:21 +0200
Subject: [PATCH 6/8] make ignoreTrailingSlashes an option of .intercept

---
 lib/mock/mock-interceptor.js               | 10 +++--
 lib/mock/mock-utils.js                     | 47 ++++++++++++--------
 test/mock-interceptor-unused-assertions.js |  1 +
 test/mock-interceptor.js                   | 51 +++++++++++++++++-----
 4 files changed, 77 insertions(+), 32 deletions(-)

diff --git a/lib/mock/mock-interceptor.js b/lib/mock/mock-interceptor.js
index 4304c8fb8ec..1ea7aac486d 100644
--- a/lib/mock/mock-interceptor.js
+++ b/lib/mock/mock-interceptor.js
@@ -7,7 +7,8 @@ const {
   kDefaultHeaders,
   kDefaultTrailers,
   kContentLength,
-  kMockDispatch
+  kMockDispatch,
+  kIgnoreTrailingSlash
 } = require('./mock-symbols')
 const { InvalidArgumentError } = require('../core/errors')
 const { serializePathWithQuery } = require('../core/util')
@@ -85,6 +86,7 @@ class MockInterceptor {
 
     this[kDispatchKey] = buildKey(opts)
     this[kDispatches] = mockDispatches
+    this[kIgnoreTrailingSlash] = opts.ignoreTrailingSlash ?? false
     this[kDefaultHeaders] = {}
     this[kDefaultTrailers] = {}
     this[kContentLength] = false
@@ -137,7 +139,7 @@ class MockInterceptor {
       }
 
       // Add usual dispatch data, but this time set the data parameter to function that will eventually provide data.
-      const newMockDispatch = addMockDispatch(this[kDispatches], this[kDispatchKey], wrappedDefaultsCallback)
+      const newMockDispatch = addMockDispatch(this[kDispatches], this[kDispatchKey], wrappedDefaultsCallback, { ignoreTrailingSlash: this[kIgnoreTrailingSlash] })
       return new MockScope(newMockDispatch)
     }
 
@@ -154,7 +156,7 @@ class MockInterceptor {
 
     // Send in-already provided data like usual
     const dispatchData = this.createMockScopeDispatchData(replyParameters)
-    const newMockDispatch = addMockDispatch(this[kDispatches], this[kDispatchKey], dispatchData)
+    const newMockDispatch = addMockDispatch(this[kDispatches], this[kDispatchKey], dispatchData, { ignoreTrailingSlash: this[kIgnoreTrailingSlash] })
     return new MockScope(newMockDispatch)
   }
 
@@ -166,7 +168,7 @@ class MockInterceptor {
       throw new InvalidArgumentError('error must be defined')
     }
 
-    const newMockDispatch = addMockDispatch(this[kDispatches], this[kDispatchKey], { error })
+    const newMockDispatch = addMockDispatch(this[kDispatches], this[kDispatchKey], { error }, { ignoreTrailingSlash: this[kIgnoreTrailingSlash] })
     return new MockScope(newMockDispatch)
   }
 
diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index 2096957f388..e74ffe64cdc 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -6,8 +6,7 @@ const {
   kMockAgent,
   kOriginalDispatch,
   kOrigin,
-  kGetNetConnect,
-  kIgnoreTrailingSlash
+  kGetNetConnect
 } = require('./mock-symbols')
 const { serializePathWithQuery } = require('../core/util')
 const { STATUS_CODES } = require('node:http')
@@ -134,8 +133,16 @@ function getMockDispatch (mockDispatches, key) {
   const basePath = key.query ? serializePathWithQuery(key.path, key.query) : key.path
   const resolvedPath = typeof basePath === 'string' ? safeUrl(basePath) : basePath
 
+  const resolvedPathWithoutTrailingSlash = removeTrailingSlash(resolvedPath)
+
   // Match path
-  let matchedMockDispatches = mockDispatches.filter(({ consumed }) => !consumed).filter(({ path }) => matchValue(safeUrl(path), resolvedPath))
+  let matchedMockDispatches = mockDispatches
+    .filter(({ consumed }) => !consumed)
+    .filter(({ path, ignoreTrailingSlash }) => {
+      return ignoreTrailingSlash
+        ? matchValue(removeTrailingSlash(safeUrl(path)), resolvedPathWithoutTrailingSlash)
+        : matchValue(safeUrl(path), resolvedPath)
+    })
   if (matchedMockDispatches.length === 0) {
     throw new MockNotMatchedError(`Mock dispatch not matched for path '${resolvedPath}'`)
   }
@@ -162,8 +169,8 @@ function getMockDispatch (mockDispatches, key) {
   return matchedMockDispatches[0]
 }
 
-function addMockDispatch (mockDispatches, key, data) {
-  const baseData = { timesInvoked: 0, times: 1, persist: false, consumed: false }
+function addMockDispatch (mockDispatches, key, data, opts) {
+  const baseData = { timesInvoked: 0, times: 1, persist: false, consumed: false, ...opts }
   const replyData = typeof data === 'function' ? { callback: data } : { ...data }
   const newMockDispatch = { ...baseData, ...key, pending: true, data: { error: null, ...replyData } }
   mockDispatches.push(newMockDispatch)
@@ -182,20 +189,24 @@ function deleteMockDispatch (mockDispatches, key) {
   }
 }
 
-function buildKey (opts) {
-  let { path, method, body, headers, query, ignoreTrailingSlash = false } = opts
-
-  // normalize path if it is a string
-  if (ignoreTrailingSlash && typeof path === 'string') {
-    while (path.endsWith('/')) {
-      path = path.slice(0, -1)
-    }
+/**
+ * @param {string} path Path to remove trailing slash from
+ */
+function removeTrailingSlash (path) {
+  while (path.endsWith('/')) {
+    path = path.slice(0, -1)
+  }
 
-    if (path.length === 0) {
-      path = '/'
-    }
+  if (path.length === 0) {
+    path = '/'
   }
 
+  return path
+}
+
+function buildKey (opts) {
+  const { path, method, body, headers, query } = opts
+
   return {
     path,
     method,
@@ -244,7 +255,7 @@ async function getResponse (body) {
  */
 function mockDispatch (opts, handler) {
   // Get mock dispatch from built key
-  const key = buildKey({ ignoreTrailingSlash: this[kIgnoreTrailingSlash], ...opts })
+  const key = buildKey(opts)
   const mockDispatch = getMockDispatch(this[kDispatches], key)
 
   mockDispatch.timesInvoked++
@@ -309,7 +320,7 @@ function mockDispatch (opts, handler) {
     deleteMockDispatch(mockDispatches, key)
   }
 
-  function resume () {}
+  function resume () { }
 
   return true
 }
diff --git a/test/mock-interceptor-unused-assertions.js b/test/mock-interceptor-unused-assertions.js
index 318907a8527..ddb5aeabab1 100644
--- a/test/mock-interceptor-unused-assertions.js
+++ b/test/mock-interceptor-unused-assertions.js
@@ -266,6 +266,7 @@ test('returns unused interceptors', t => {
       persist: false,
       consumed: false,
       pending: true,
+      ignoreTrailingSlash: false,
       path: '/',
       method: 'GET',
       body: undefined,
diff --git a/test/mock-interceptor.js b/test/mock-interceptor.js
index ceda8f2e908..7b17efe1a6e 100644
--- a/test/mock-interceptor.js
+++ b/test/mock-interceptor.js
@@ -284,20 +284,51 @@ describe('https://github.com/nodejs/undici/issues/3649', () => {
 
       t.deepStrictEqual(await res.json(), { ok: true })
     })
-  })
 
-  test('MockAgent should match with or without trailing slash /6', async (t) => {
-    t = tspl(t, { plan: 1 })
+    test(`MockAgent should match with or without trailing slash by setting ignoreTrailingSlash as intercept option /${index}`, async (t) => {
+      t = tspl(t, { plan: 1 })
 
-    const mockAgent = new MockAgent()
-    mockAgent.disableNetConnect()
-    mockAgent
-      .get('https://localhost')
-      .intercept({ path: '/' }).reply(200, { ok: true })
+      const mockAgent = new MockAgent()
+      mockAgent.disableNetConnect()
+      mockAgent
+        .get('https://localhost')
+        .intercept({ path: interceptPath, ignoreTrailingSlash: true }).reply(200, { ok: true })
+
+      const res = await fetch(new URL(fetchedPath, 'https://localhost'), { dispatcher: mockAgent })
 
-    const res = await fetch(new URL('', 'https://localhost'), { dispatcher: mockAgent })
+      t.deepStrictEqual(await res.json(), { ok: true })
+    })
 
-    t.deepStrictEqual(await res.json(), { ok: true })
+    if (
+      (interceptPath === fetchedPath && (interceptPath !== '' && fetchedPath !== '')) ||
+      (interceptPath === '/' && fetchedPath === '')
+    ) {
+      test(`MockAgent should should match on strict equal cases of paths when ignoreTrailingSlash is not set /${index}`, async (t) => {
+        t = tspl(t, { plan: 1 })
+
+        const mockAgent = new MockAgent()
+        mockAgent.disableNetConnect()
+        mockAgent
+          .get('https://localhost')
+          .intercept({ path: interceptPath }).reply(200, { ok: true })
+
+        const res = await fetch(new URL(fetchedPath, 'https://localhost'), { dispatcher: mockAgent })
+
+        t.deepStrictEqual(await res.json(), { ok: true })
+      })
+    } else {
+      test(`MockAgent should should reject on not strict equal cases of paths when ignoreTrailingSlash is not set /${index}`, async (t) => {
+        t = tspl(t, { plan: 1 })
+
+        const mockAgent = new MockAgent()
+        mockAgent.disableNetConnect()
+        mockAgent
+          .get('https://localhost')
+          .intercept({ path: interceptPath }).reply(200, { ok: true })
+
+        t.rejects(fetch(new URL(fetchedPath, 'https://localhost'), { dispatcher: mockAgent }))
+      })
+    }
   })
 })
 

From 08f8ad7e45133ccb320545735b741e38409f47ac Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Thu, 3 Oct 2024 11:06:38 +0200
Subject: [PATCH 7/8] Apply suggestions from code review

---
 lib/mock/mock-utils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index e74ffe64cdc..b19aaaf8e11 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -320,7 +320,7 @@ function mockDispatch (opts, handler) {
     deleteMockDispatch(mockDispatches, key)
   }
 
-  function resume () { }
+  function resume () {}
 
   return true
 }

From 538feb161e9483852ac43db5e67a3e108c076d41 Mon Sep 17 00:00:00 2001
From: Aras Abbasi <aras.abbasi@googlemail.com>
Date: Thu, 3 Oct 2024 11:14:50 +0200
Subject: [PATCH 8/8] add documentation

---
 docs/docs/api/MockAgent.md | 2 ++
 docs/docs/api/MockPool.md  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/docs/docs/api/MockAgent.md b/docs/docs/api/MockAgent.md
index 85ae69046e7..e5713db2712 100644
--- a/docs/docs/api/MockAgent.md
+++ b/docs/docs/api/MockAgent.md
@@ -18,6 +18,8 @@ Extends: [`AgentOptions`](Agent.md#parameter-agentoptions)
 
 * **agent** `Agent` (optional) - Default: `new Agent([options])` - a custom agent encapsulated by the MockAgent.
 
+* **ignoreTrailingSlash** `boolean` (optional) - Default: `false` - set the default value for `ignoreTrailingSlash` for interceptors.
+
 ### Example - Basic MockAgent instantiation
 
 This will instantiate the MockAgent. It will not do anything until registered as the agent to use with requests and mock interceptions are added.
diff --git a/docs/docs/api/MockPool.md b/docs/docs/api/MockPool.md
index 18b97d958f6..ac8185ffd76 100644
--- a/docs/docs/api/MockPool.md
+++ b/docs/docs/api/MockPool.md
@@ -58,6 +58,7 @@ Returns: `MockInterceptor` corresponding to the input options.
 * **body** `string | RegExp | (body: string) => boolean` - (optional) - a matcher for the HTTP request body.
 * **headers** `Record<string, string | RegExp | (body: string) => boolean`> - (optional) - a matcher for the HTTP request headers. To be intercepted, a request must match all defined headers. Extra headers not defined here may (or may not) be included in the request and do not affect the interception in any way.
 * **query** `Record<string, any> | null` - (optional) - a matcher for the HTTP request query string params. Only applies when a `string` was provided for `MockPoolInterceptOptions.path`.
+* **ignoreTrailingSlash** `boolean` - (optional) - set to `true` if the matcher should also match by ignoring potential trailing slashes in `MockPoolInterceptOptions.path`.
 
 ### Return: `MockInterceptor`