How to test an exception from a future

Question

Continuing from yesterday question, how would I test that a async method throws an exception.

main(){
  test( "test2", () async {
    expect( await throws(), throwsException);
  });

}

Future throws () async {
  throw new FormatException("hello");
}

Answer 1

The easiest and shortest answer is:

expect(throws(), throwsException)

To test exception/error type:

expect(throws(), throwsA(predicate((e) => e is MyException)));