Dart Unit tests - expectException method.

anywhere.dart

import 'package:test/test.dart';

main() {

   test("throw excpetion test",() {
     expectException(()=>throw Exception("sample error"), Exception);
   });
}


typedef void Runner();

void expectException(Runner runner, type) {
  var thrownException;
  try {
    runner();
  } catch (e) {
    thrownException = e;
  }
  expect(thrownException?.runtimeType, type,
      reason: "Expecting Exception of type: $type");
}