fix(vitest): don't fail if the working directory starts with a small …

…drive letter

Fixes vitest-dev#5772
Fixes vitest-dev#5798
Fixes vitest-dev#5251

packages/vite-node/src/utils.ts

@@ -6,17 +6,6 @@ import { dirname, join, resolve } from 'pathe'
 
 export const isWindows = process.platform === 'win32'
 
-const drive = isWindows ? process.cwd()[0] : null
-const driveOpposite = drive
-  ? drive === drive.toUpperCase()
-    ? drive.toLowerCase()
-    : drive.toUpperCase()
-  : null
-const driveRegexp = drive ? new RegExp(`(?:^|/@fs/)${drive}(\:[\\/])`) : null
-const driveOppositeRegext = driveOpposite
-  ? new RegExp(`(?:^|/@fs/)${driveOpposite}(\:[\\/])`)
-  : null
-
 export function slash(str: string) {
   return str.replace(/\\/g, '/')
 }
@@ -28,11 +17,6 @@ export function normalizeRequestId(id: string, base?: string): string {
     id = `/${id.slice(base.length)}`
   }
 
-  // keep drive the same as in process cwd
-  if (driveRegexp && !driveRegexp?.test(id) && driveOppositeRegext?.test(id)) {
-    id = id.replace(driveOppositeRegext, `${drive}$1`)
-  }
-
   return id
     .replace(/^\/@id\/__x00__/, '\0') // virtual modules start with `\0`
     .replace(/^\/@id\//, '')

packages/vitest/src/node/cli/cac.ts

@@ -259,6 +259,14 @@ function normalizeCliOptions(argv: CliOptions): CliOptions {
 async function start(mode: VitestRunMode, cliFilters: string[], options: CliOptions): Promise<void> {
   try {
     process.title = 'node (vitest)'
+    // pathe always normalizes the drive letter to be uppercase
+    // if user runs Vitest from c:/, the built-in ESM loader in tests
+    // will resolve a different Vitest instance than the one in vite-node
+    // we can either
+    // 1. normalize the CWD so it works in the CLI, but might break when API is used directly
+    // 2. ask "pathe" to not normalize the drive letter
+    // 2. don't use "pathe" when resolving paths
+    process.chdir(normalize(process.cwd()))
   }
   catch {}