fix: use require.cache to resolve root

src/index.ts

@@ -15,12 +15,14 @@ function traverseFilePathUntil(filename: string, predicate: (filename: string) =
  return current
 }
 
-// Update to path.dirname(url.fileURLToPath(import.meta.url)) whenever we migrate to ESM
 /* eslint-disable unicorn/prefer-module */
-loadConfig.root = traverseFilePathUntil(
- require.main?.path ?? module.path,
- (p) => !(p.includes('node_modules') || p.includes('.pnpm') || p.includes('.yarn')),
-)
+loadConfig.root =
+ process.env.OCLIF_TEST_ROOT ??
+ Object.values(require.cache).find((m) => m?.children.includes(module))?.filename ??
+ traverseFilePathUntil(
+ require.main?.path ?? module.path,
+ (p) => !(p.includes('node_modules') || p.includes('.pnpm') || p.includes('.yarn')),
+ )
 /* eslint-enable unicorn/prefer-module */
 
 // Using a named export to import fancy causes this issue: https://github.com/oclif/test/issues/516