isTestFile static method
Utility to check if a file is a test file (by path).
Returns true if the file path contains '_test.dart' or is under a 'test/' directory. Normalizes path separators to work on both Windows and Unix.
Implementation
static bool isTestFile(String path) {
final normalizedPath = path.replaceAll('\\', '/');
return normalizedPath.contains('_test.dart') ||
normalizedPath.contains('/test/');
}