add pages-dev-proxy-with-script fixture

fixtures/pages-dev-proxy-with-script/_worker.js

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+export default {
+	fetch() {
+		return new Response("hello from _worker.js");
+	},
+};

fixtures/pages-dev-proxy-with-script/custom/script/path/index.js

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+export default {
+	fetch() {
+		return new Response("hello from custom/script/path/index.js");
+	},
+};

fixtures/pages-dev-proxy-with-script/package.json

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+{
+	"name": "pages-dev-proxy-with-script",
+	"version": "0.0.0",
+	"private": true,
+	"sideEffects": false,
+	"scripts": {
+		"dev": "npx wrangler pages dev public",
+		"test": "vitest run",
+		"test:watch": "vitest",
+		"type:tests": "tsc -p ./tests/tsconfig.json"
+	},
+	"devDependencies": {
+		"@cloudflare/workers-tsconfig": "workspace:*",
+		"@cloudflare/workers-types": "^4.20221111.1",
+		"undici": "^5.9.1",
+		"wrangler": "workspace:*"
+	},
+	"engines": {
+		"node": ">=16.13"
+	}
+}

fixtures/pages-dev-proxy-with-script/tests/index.test.ts

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+import path from "node:path";
+import { Response, fetch } from "undici";
+import { describe, it, expect } from "vitest";
+import { ChildProcess, fork } from "node:child_process";
+import { setTimeout } from "node:timers/promises";
+
+describe("Pages dev with proxy and a script file", () => {
+	it("should handle requests using a script from the default _worker.js path", async () => {
+		const { port, childProcess } = await startWranglerPagesDevProxy();
+		const combinedResponse = await waitUntilReady(`http://127.0.0.1:${port}/`);
+		const respText = await combinedResponse.text();
+		expect(respText).toMatchInlineSnapshot('"hello from _worker.js"');
+		await terminateChildProcess(childProcess);
+	});
+
+	it("should handle requests using a script from a custom script path", async () => {
+		const { port, childProcess } = await startWranglerPagesDevProxy([
+			"--script-path=custom/script/path/index.js",
+		]);
+		const combinedResponse = await waitUntilReady(`http://127.0.0.1:${port}/`);
+		const respText = await combinedResponse.text();
+		expect(respText).toMatchInlineSnapshot(
+			'"hello from custom/script/path/index.js"'
+		);
+		await terminateChildProcess(childProcess);
+	});
+});
+
+async function startWranglerPagesDevProxy(extraArgs: string[] = []): Promise<{
+	childProcess: ChildProcess;
+	port: string;
+}> {
+	return new Promise(async (resolve) => {
+		const childProcess = fork(
+			path.join("..", "..", "packages", "wrangler", "bin", "wrangler.js"),
+			["pages", "dev", "--port=0", "--proxy=9999", ...extraArgs],
+			{
+				cwd: path.resolve(__dirname, ".."),
+				env: { BROWSER: "none", ...process.env },
+				stdio: ["ignore", "ignore", "ignore", "ipc"],
+			}
+		).on("message", (message) => {
+			const parsedMessage = JSON.parse(message.toString());
+			resolve({
+				childProcess,
+				port: parsedMessage.port,
+			});
+		});
+		debugger;
+	});
+}
+
+function terminateChildProcess(childProcess: ChildProcess): Promise<unknown> {
+	return new Promise((resolve, reject) => {
+		childProcess.once("exit", (code) => {
+			if (!code) {
+				resolve(code);
+			} else {
+				reject(code);
+			}
+		});
+		childProcess.kill("SIGTERM");
+	});
+}
+
+async function waitUntilReady(url: string): Promise<Response> {
+	let response: Response | undefined = undefined;
+
+	while (response === undefined) {
+		await setTimeout(500);
+
+		try {
+			response = await fetch(url);
+		} catch (e) {}
+	}
+
+	return response as Response;
+}

fixtures/pages-dev-proxy-with-script/tests/tsconfig.json

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+{
+	"extends": "@cloudflare/workers-tsconfig/tsconfig.json",
+	"compilerOptions": {
+		"types": ["node"]
+	},
+	"include": ["**/*.ts", "../../../node-types.d.ts"]
+}

fixtures/pages-dev-proxy-with-script/tsconfig.json

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+{
+	"include": ["index.d.ts"],
+	"compilerOptions": {
+		"target": "ES2020",
+		"module": "CommonJS",
+		"lib": ["ES2020"],
+		"types": ["@cloudflare/workers-types"],
+		"moduleResolution": "node",
+		"noEmit": true,
+		"skipLibCheck": true
+	}
+}

fixtures/pages-dev-proxy-with-script/vitest.config.ts

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+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+	test: {
+		testTimeout: 10_000,
+		hookTimeout: 10_000,
+		teardownTimeout: 10_000,
+		useAtomics: true,
+	},
+});