in lib/src/file_descriptor.dart [197:204]
Future<void> _validate(String prettyPath, List<int> actualContents) async {
try {
expect(
_isBinary ? actualContents : utf8.decode(actualContents), _matcher);
} on TestFailure catch (error) {
fail('Invalid contents for file "$prettyPath":\n${error.message}');
}
}