fix(pwt): compatibility in CWD with wrong casing

packages/playwright-test/src/loader.ts

@@ -293,6 +293,8 @@ export class Loader {
   }
 
   private async _requireOrImport(file: string) {
+    if (process.platform === 'win32')
+      file = await fixWin32FilepathCapitalization(file);
     const revertBabelRequire = installTransform();
     const isModule = fileIsModule(file);
     try {
@@ -678,3 +680,23 @@ export function folderIsModule(folder: string): boolean {
   // Rely on `require` internal caching logic.
   return require(packageJsonPath).type === 'module';
 }
+
+async function fixWin32FilepathCapitalization(file: string): Promise<string> {
+  /**
+   * On Windows with PowerShell <= 6 it is possible to have a CWD with different
+   * casing than what the actual directory on the filesystem is. This can cause
+   * that we require the file multiple times with different casing. To mitigate
+   * this we get the actual underlying filesystem path and use that.
+   * https://github.com/microsoft/playwright/issues/9193#issuecomment-1219362150
+   */
+  const realFile = await new Promise<string>((resolve, reject) => fs.realpath.native(file, (error, realFile) => {
+    if (error)
+      return reject(error);
+    resolve(realFile);
+  }));
+  // We do not want to resolve them (e.g. 8.3 filenames), so we do a best effort
+  // approach by only using it if the actual lowercase characters are the same:
+  if (realFile.toLowerCase() === file.toLowerCase())
+    return realFile;
+  return file;
+}

tests/installation/npmTest.ts

@@ -25,8 +25,8 @@ import debugLogger from 'debug';
 import { Registry }  from './registry';
 import { spawnAsync } from './spawnAsync';
 
-
-export const TMP_WORKSPACES = path.join(os.platform() === 'darwin' ? '/tmp' : os.tmpdir(), 'pwt', 'workspaces');
+// os.tmpdir() on Windows returns a 8.3 filename, so we resolve it.
+export const TMP_WORKSPACES = path.join(os.platform() === 'darwin' ? '/tmp' : fs.realpathSync.native(os.tmpdir()), 'pwt', 'workspaces');
 
 const debug = debugLogger('itest');
 

tests/installation/playwright-test-should-handle-incorrect-cwd-casing.spec.ts

@@ -0,0 +1,41 @@
+/**
+ * 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 fs from 'fs';
+import path from 'path';
+import { test, expect } from './npmTest';
+
+test('@playwright/test should handle incorrect cwd casing', async ({ exec, tmpWorkspace }) => {
+  test.skip(process.platform !== 'win32');
+  const cwd = path.join(tmpWorkspace, 'expectedcasing');
+  fs.mkdirSync(cwd);
+  fs.writeFileSync(path.join(cwd, 'sample.spec.ts'), `
+    import { test, expect } from '@playwright/test';
+    test('should pass', async () => {
+      expect(1 + 1).toBe(2);
+    })
+  `);
+  fs.writeFileSync(path.join(cwd, 'sample.spec.js'), `
+    const { test, expect } = require('@playwright/test');
+    test('should pass', async () => {
+      expect(1 + 1).toBe(2);
+    })
+  `);
+  await exec('npm init -y', { cwd });
+  await exec('npm i --foreground-scripts @playwright/test', { cwd });
+
+  const output = await exec('npx playwright test --reporter=list', { cwd: path.join(tmpWorkspace, 'eXpEcTeDcAsInG') });
+  expect(output).toContain('2 passed');
+});

tests/installation/playwright.config.ts

@@ -27,7 +27,7 @@ const config: PlaywrightTestConfig = {
   timeout: 5 * 60 * 1000,
   retries: 0,
   reporter: process.env.CI ? [
-    ['dot'],
+    ['list'],
     ['json', { outputFile: path.join(outputDir, 'report.json') }],
   ] : [['list'], ['html', { open: 'on-failure' }]],
   forbidOnly: !!process.env.CI,