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authorEgor Tensin <egor@tensin.name>2024-01-28 11:18:12 +0100
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+# Class: MockPool
+
+Extends: `undici.Pool`
+
+A mock Pool class that implements the Pool API and is used by MockAgent to intercept real requests and return mocked responses.
+
+## `new MockPool(origin, [options])`
+
+Arguments:
+
+* **origin** `string` - It should only include the **protocol, hostname, and port**.
+* **options** `MockPoolOptions` - It extends the `Pool` options.
+
+Returns: `MockPool`
+
+### Parameter: `MockPoolOptions`
+
+Extends: `PoolOptions`
+
+* **agent** `Agent` - the agent to associate this MockPool with.
+
+### Example - Basic MockPool instantiation
+
+We can use MockAgent to instantiate a MockPool ready to be used to intercept specified requests. It will not do anything until registered as the agent to use and any mock request are registered.
+
+```js
+import { MockAgent } from 'undici'
+
+const mockAgent = new MockAgent()
+
+const mockPool = mockAgent.get('http://localhost:3000')
+```
+
+## Instance Methods
+
+### `MockPool.intercept(options)`
+
+This method defines the interception rules for matching against requests for a MockPool or MockPool. We can intercept multiple times on a single instance, but each intercept is only used once. For example if you expect to make 2 requests inside a test, you need to call `intercept()` twice. Assuming you use `disableNetConnect()` you will get `MockNotMatchedError` on the second request when you only call `intercept()` once.
+
+When defining interception rules, all the rules must pass for a request to be intercepted. If a request is not intercepted, a real request will be attempted.
+
+| Matcher type | Condition to pass |
+|:------------:| -------------------------- |
+| `string` | Exact match against string |
+| `RegExp` | Regex must pass |
+| `Function` | Function must return true |
+
+Arguments:
+
+* **options** `MockPoolInterceptOptions` - Interception options.
+
+Returns: `MockInterceptor` corresponding to the input options.
+
+### Parameter: `MockPoolInterceptOptions`
+
+* **path** `string | RegExp | (path: string) => boolean` - a matcher for the HTTP request path. When a `RegExp` or callback is used, it will match against the request path including all query parameters in alphabetical order. When a `string` is provided, the query parameters can be conveniently specified through the `MockPoolInterceptOptions.query` setting.
+* **method** `string | RegExp | (method: string) => boolean` - (optional) - a matcher for the HTTP request method. Defaults to `GET`.
+* **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`.
+
+### Return: `MockInterceptor`
+
+We can define the behaviour of an intercepted request with the following options.
+
+* **reply** `(statusCode: number, replyData: string | Buffer | object | MockInterceptor.MockResponseDataHandler, responseOptions?: MockResponseOptions) => MockScope` - define a reply for a matching request. You can define the replyData as a callback to read incoming request data. Default for `responseOptions` is `{}`.
+* **reply** `(callback: MockInterceptor.MockReplyOptionsCallback) => MockScope` - define a reply for a matching request, allowing dynamic mocking of all reply options rather than just the data.
+* **replyWithError** `(error: Error) => MockScope` - define an error for a matching request to throw.
+* **defaultReplyHeaders** `(headers: Record<string, string>) => MockInterceptor` - define default headers to be included in subsequent replies. These are in addition to headers on a specific reply.
+* **defaultReplyTrailers** `(trailers: Record<string, string>) => MockInterceptor` - define default trailers to be included in subsequent replies. These are in addition to trailers on a specific reply.
+* **replyContentLength** `() => MockInterceptor` - define automatically calculated `content-length` headers to be included in subsequent replies.
+
+The reply data of an intercepted request may either be a string, buffer, or JavaScript object. Objects are converted to JSON while strings and buffers are sent as-is.
+
+By default, `reply` and `replyWithError` define the behaviour for the first matching request only. Subsequent requests will not be affected (this can be changed using the returned `MockScope`).
+
+### Parameter: `MockResponseOptions`
+
+* **headers** `Record<string, string>` - headers to be included on the mocked reply.
+* **trailers** `Record<string, string>` - trailers to be included on the mocked reply.
+
+### Return: `MockScope`
+
+A `MockScope` is associated with a single `MockInterceptor`. With this, we can configure the default behaviour of a intercepted reply.
+
+* **delay** `(waitInMs: number) => MockScope` - delay the associated reply by a set amount in ms.
+* **persist** `() => MockScope` - any matching request will always reply with the defined response indefinitely.
+* **times** `(repeatTimes: number) => MockScope` - any matching request will reply with the defined response a fixed amount of times. This is overridden by **persist**.
+
+#### Example - Basic Mocked Request
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+// MockPool
+const mockPool = mockAgent.get('http://localhost:3000')
+mockPool.intercept({ path: '/foo' }).reply(200, 'foo')
+
+const {
+ statusCode,
+ body
+} = await request('http://localhost:3000/foo')
+
+console.log('response received', statusCode) // response received 200
+
+for await (const data of body) {
+ console.log('data', data.toString('utf8')) // data foo
+}
+```
+
+#### Example - Mocked request using reply data callbacks
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/echo',
+ method: 'GET',
+ headers: {
+ 'User-Agent': 'undici',
+ Host: 'example.com'
+ }
+}).reply(200, ({ headers }) => ({ message: headers.get('message') }))
+
+const { statusCode, body, headers } = await request('http://localhost:3000', {
+ headers: {
+ message: 'hello world!'
+ }
+})
+
+console.log('response received', statusCode) // response received 200
+console.log('headers', headers) // { 'content-type': 'application/json' }
+
+for await (const data of body) {
+ console.log('data', data.toString('utf8')) // { "message":"hello world!" }
+}
+```
+
+#### Example - Mocked request using reply options callback
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/echo',
+ method: 'GET',
+ headers: {
+ 'User-Agent': 'undici',
+ Host: 'example.com'
+ }
+}).reply(({ headers }) => ({ statusCode: 200, data: { message: headers.get('message') }})))
+
+const { statusCode, body, headers } = await request('http://localhost:3000', {
+ headers: {
+ message: 'hello world!'
+ }
+})
+
+console.log('response received', statusCode) // response received 200
+console.log('headers', headers) // { 'content-type': 'application/json' }
+
+for await (const data of body) {
+ console.log('data', data.toString('utf8')) // { "message":"hello world!" }
+}
+```
+
+#### Example - Basic Mocked requests with multiple intercepts
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).reply(200, 'foo')
+
+mockPool.intercept({
+ path: '/hello',
+ method: 'GET',
+}).reply(200, 'hello')
+
+const result1 = await request('http://localhost:3000/foo')
+
+console.log('response received', result1.statusCode) // response received 200
+
+for await (const data of result1.body) {
+ console.log('data', data.toString('utf8')) // data foo
+}
+
+const result2 = await request('http://localhost:3000/hello')
+
+console.log('response received', result2.statusCode) // response received 200
+
+for await (const data of result2.body) {
+ console.log('data', data.toString('utf8')) // data hello
+}
+```
+
+#### Example - Mocked request with query body, request headers and response headers and trailers
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo?hello=there&see=ya',
+ method: 'POST',
+ body: 'form1=data1&form2=data2',
+ headers: {
+ 'User-Agent': 'undici',
+ Host: 'example.com'
+ }
+}).reply(200, { foo: 'bar' }, {
+ headers: { 'content-type': 'application/json' },
+ trailers: { 'Content-MD5': 'test' }
+})
+
+const {
+ statusCode,
+ headers,
+ trailers,
+ body
+} = await request('http://localhost:3000/foo?hello=there&see=ya', {
+ method: 'POST',
+ body: 'form1=data1&form2=data2',
+ headers: {
+ foo: 'bar',
+ 'User-Agent': 'undici',
+ Host: 'example.com'
+ }
+ })
+
+console.log('response received', statusCode) // response received 200
+console.log('headers', headers) // { 'content-type': 'application/json' }
+
+for await (const data of body) {
+ console.log('data', data.toString('utf8')) // '{"foo":"bar"}'
+}
+
+console.log('trailers', trailers) // { 'content-md5': 'test' }
+```
+
+#### Example - Mocked request using different matchers
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: /^GET$/,
+ body: (value) => value === 'form=data',
+ headers: {
+ 'User-Agent': 'undici',
+ Host: /^example.com$/
+ }
+}).reply(200, 'foo')
+
+const {
+ statusCode,
+ body
+} = await request('http://localhost:3000/foo', {
+ method: 'GET',
+ body: 'form=data',
+ headers: {
+ foo: 'bar',
+ 'User-Agent': 'undici',
+ Host: 'example.com'
+ }
+})
+
+console.log('response received', statusCode) // response received 200
+
+for await (const data of body) {
+ console.log('data', data.toString('utf8')) // data foo
+}
+```
+
+#### Example - Mocked request with reply with a defined error
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).replyWithError(new Error('kaboom'))
+
+try {
+ await request('http://localhost:3000/foo', {
+ method: 'GET'
+ })
+} catch (error) {
+ console.error(error) // Error: kaboom
+}
+```
+
+#### Example - Mocked request with defaultReplyHeaders
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).defaultReplyHeaders({ foo: 'bar' })
+ .reply(200, 'foo')
+
+const { headers } = await request('http://localhost:3000/foo')
+
+console.log('headers', headers) // headers { foo: 'bar' }
+```
+
+#### Example - Mocked request with defaultReplyTrailers
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).defaultReplyTrailers({ foo: 'bar' })
+ .reply(200, 'foo')
+
+const { trailers } = await request('http://localhost:3000/foo')
+
+console.log('trailers', trailers) // trailers { foo: 'bar' }
+```
+
+#### Example - Mocked request with automatic content-length calculation
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).replyContentLength().reply(200, 'foo')
+
+const { headers } = await request('http://localhost:3000/foo')
+
+console.log('headers', headers) // headers { 'content-length': '3' }
+```
+
+#### Example - Mocked request with automatic content-length calculation on an object
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).replyContentLength().reply(200, { foo: 'bar' })
+
+const { headers } = await request('http://localhost:3000/foo')
+
+console.log('headers', headers) // headers { 'content-length': '13' }
+```
+
+#### Example - Mocked request with persist enabled
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).reply(200, 'foo').persist()
+
+const result1 = await request('http://localhost:3000/foo')
+// Will match and return mocked data
+
+const result2 = await request('http://localhost:3000/foo')
+// Will match and return mocked data
+
+// Etc
+```
+
+#### Example - Mocked request with times enabled
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET'
+}).reply(200, 'foo').times(2)
+
+const result1 = await request('http://localhost:3000/foo')
+// Will match and return mocked data
+
+const result2 = await request('http://localhost:3000/foo')
+// Will match and return mocked data
+
+const result3 = await request('http://localhost:3000/foo')
+// Will not match and make attempt a real request
+```
+
+#### Example - Mocked request with path callback
+
+```js
+import { MockAgent, setGlobalDispatcher, request } from 'undici'
+import querystring from 'querystring'
+
+const mockAgent = new MockAgent()
+setGlobalDispatcher(mockAgent)
+
+const mockPool = mockAgent.get('http://localhost:3000')
+
+const matchPath = requestPath => {
+ const [pathname, search] = requestPath.split('?')
+ const requestQuery = querystring.parse(search)
+
+ if (!pathname.startsWith('/foo')) {
+ return false
+ }
+
+ if (!Object.keys(requestQuery).includes('foo') || requestQuery.foo !== 'bar') {
+ return false
+ }
+
+ return true
+}
+
+mockPool.intercept({
+ path: matchPath,
+ method: 'GET'
+}).reply(200, 'foo')
+
+const result = await request('http://localhost:3000/foo?foo=bar')
+// Will match and return mocked data
+```
+
+### `MockPool.close()`
+
+Closes the mock pool and de-registers from associated MockAgent.
+
+Returns: `Promise<void>`
+
+#### Example - clean up after tests are complete
+
+```js
+import { MockAgent } from 'undici'
+
+const mockAgent = new MockAgent()
+const mockPool = mockAgent.get('http://localhost:3000')
+
+await mockPool.close()
+```
+
+### `MockPool.dispatch(options, handlers)`
+
+Implements [`Dispatcher.dispatch(options, handlers)`](Dispatcher.md#dispatcherdispatchoptions-handler).
+
+### `MockPool.request(options[, callback])`
+
+See [`Dispatcher.request(options [, callback])`](Dispatcher.md#dispatcherrequestoptions-callback).
+
+#### Example - MockPool request
+
+```js
+import { MockAgent } from 'undici'
+
+const mockAgent = new MockAgent()
+
+const mockPool = mockAgent.get('http://localhost:3000')
+mockPool.intercept({
+ path: '/foo',
+ method: 'GET',
+}).reply(200, 'foo')
+
+const {
+ statusCode,
+ body
+} = await mockPool.request({
+ origin: 'http://localhost:3000',
+ path: '/foo',
+ method: 'GET'
+})
+
+console.log('response received', statusCode) // response received 200
+
+for await (const data of body) {
+ console.log('data', data.toString('utf8')) // data foo
+}
+```