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feat(ct): expose
msw fixture that accepts msw-style request handlers
Implemented on top of `context.route()`.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| /** | ||
| * Copyright (c) Microsoft Corporation. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| import type * as playwright from 'playwright/test'; | ||
|
|
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| interface RequestHandler { | ||
| run(args: { request: Request, resolutionContext: { baseUrl?: string }, requestId: string }): Promise<{ response: Response } | undefined>; | ||
| } | ||
|
|
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| export interface MSW { | ||
| use(...handlers: RequestHandler[]): Promise<void>; | ||
| } | ||
|
|
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| let lastRequestId = 0; | ||
| let fetchOverrideCounter = 0; | ||
| const currentlyInterceptingInContexts = new Map<playwright.BrowserContext, number>(); | ||
| const originalFetch = globalThis.fetch; | ||
|
|
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| async function executeRequestHandlers(request: Request, handlers: RequestHandler[], baseUrl: string | undefined): Promise<Response | undefined> { | ||
| const requestId = String(++lastRequestId); | ||
| const resolutionContext = { baseUrl }; | ||
| for (const handler of handlers) { | ||
| const result = await handler.run({ request, requestId, resolutionContext }); | ||
| if (result?.response) | ||
| return result.response; | ||
| } | ||
| } | ||
|
|
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| async function globalFetch(...args: Parameters<typeof globalThis.fetch>) { | ||
| if (args[0] && args[0] instanceof Request) { | ||
| const request = args[0]; | ||
| if (request.headers.get('x-msw-intention') === 'bypass') { | ||
| const cookieHeaders = await Promise.all([...currentlyInterceptingInContexts.keys()].map(async context => { | ||
| const cookies = await context.cookies(request.url); | ||
| if (!cookies.length) | ||
| return undefined; | ||
| return cookies.map(c => `${c.name}=${c.value}`).join('; '); | ||
| })); | ||
|
|
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| if (!cookieHeaders.length) | ||
| throw new Error(`Cannot call fetch(bypass()) outside of a request handler`); | ||
|
|
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| if (cookieHeaders.some(h => h !== cookieHeaders[0])) | ||
| throw new Error(`Cannot call fetch(bypass()) while concurrently handling multiple requests from different browser contexts`); | ||
|
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| const headers = new Headers(request.headers); | ||
| headers.set('cookie', cookieHeaders[0]!); | ||
| headers.delete('x-msw-intention'); | ||
| args[0] = new Request(request.clone(), { headers }); | ||
| } | ||
| } | ||
| return originalFetch(...args); | ||
| } | ||
|
|
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| export class MSWImpl implements MSW { | ||
| private _context: playwright.BrowserContext; | ||
| private _handlers: RequestHandler[] = []; | ||
| private _routeHandler: (route: playwright.Route) => Promise<void>; | ||
| private _attached = false; | ||
|
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| constructor(context: playwright.BrowserContext, baseURL: string | undefined) { | ||
| this._context = context; | ||
|
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| this._routeHandler = async route => { | ||
| if (route.request().isNavigationRequest()) { | ||
| await route.fallback(); | ||
| return; | ||
| } | ||
|
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| const request = route.request(); | ||
| const headersArray = await request.headersArray(); | ||
| const headers = new Headers(); | ||
| for (const { name, value } of headersArray) | ||
| headers.append(name, value); | ||
|
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| const buffer = request.postDataBuffer(); | ||
| const body = buffer?.byteLength ? new Int8Array(buffer.buffer, buffer.byteOffset, buffer.length) : undefined; | ||
|
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| const newRequest = new Request(request.url(), { | ||
| body: body, | ||
| headers: headers, | ||
| method: request.method(), | ||
| referrer: headersArray.find(h => h.name.toLowerCase() === 'referer')?.value, | ||
| }); | ||
|
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| currentlyInterceptingInContexts.set(context, 1 + (currentlyInterceptingInContexts.get(context) || 0)); | ||
| const response = await executeRequestHandlers(newRequest, this._handlers, baseURL).finally(() => { | ||
| const value = currentlyInterceptingInContexts.get(context)! - 1; | ||
| if (value) | ||
| currentlyInterceptingInContexts.set(context, value); | ||
| else | ||
| currentlyInterceptingInContexts.delete(context); | ||
| }); | ||
|
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| if (!response) { | ||
| await route.fallback(); | ||
| return; | ||
| } | ||
|
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| if (response.status === 302 && response.headers.get('x-msw-intention') === 'passthrough') { | ||
| await route.continue(); | ||
| return; | ||
| } | ||
|
|
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| if (response.type === 'error') { | ||
| await route.abort(); | ||
| return; | ||
| } | ||
|
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| const responseHeaders: Record<string, string> = {}; | ||
| for (const [name, value] of response.headers.entries()) { | ||
| if (responseHeaders[name]) | ||
| responseHeaders[name] = responseHeaders[name] + (name.toLowerCase() === 'set-cookie' ? '\n' : ', ') + value; | ||
| else | ||
| responseHeaders[name] = value; | ||
| } | ||
| await route.fulfill({ | ||
| status: response.status, | ||
| body: Buffer.from(await response.arrayBuffer()), | ||
| headers: responseHeaders, | ||
| }); | ||
| }; | ||
| } | ||
|
|
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| async use(...handlers: RequestHandler[]) { | ||
| this._handlers = handlers.concat(this._handlers); | ||
| await this._update(); | ||
| } | ||
|
|
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| async dispose() { | ||
| this._handlers = []; | ||
| await this._update(); | ||
| } | ||
|
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| private async _update() { | ||
| if (this._handlers.length && !this._attached) { | ||
| await this._context.route('**/*', this._routeHandler); | ||
| if (!fetchOverrideCounter) | ||
| globalThis.fetch = globalFetch; | ||
| ++fetchOverrideCounter; | ||
| this._attached = true; | ||
| } | ||
| if (!this._handlers.length && this._attached) { | ||
| await this._context.unroute('**/*', this._routeHandler); | ||
| this._attached = false; | ||
| --fetchOverrideCounter; | ||
| if (!fetchOverrideCounter) | ||
| globalThis.fetch = originalFetch; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| import { useEffect, useState } from "react" | ||
|
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| export default function Fetcher() { | ||
| const [data, setData] = useState<{ name: string }>({ name: '<none>' }); | ||
| const [fetched, setFetched] = useState(false); | ||
|
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| useEffect(() => { | ||
| const doFetch = async () => { | ||
| try { | ||
| const response = await fetch('/data.json'); | ||
| setData(await response.json()); | ||
| } catch { | ||
| setData({ name: '<error>' }); | ||
| } | ||
| setFetched(true); | ||
| } | ||
|
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| if (!fetched) | ||
| doFetch(); | ||
| }, [fetched, setFetched, setData]); | ||
|
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| return <div> | ||
| <div data-testId='name'>{data.name}</div> | ||
| <button onClick={() => { | ||
| setFetched(false); | ||
| setData({ name: '<none>' }); | ||
| }}>Reset</button> | ||
| <button onClick={() => { | ||
| fetch('/post', { method: 'POST', body: 'hello from the page' }); | ||
| }}>Post it</button> | ||
| </div>; | ||
| } |
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