Utils/tests/Expect/throws_A01_t03.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion static void throws(void f(), [_CheckExceptionFn check = null, String reason = null])
/// typedef bool _CheckExceptionFn(exception)
/// Calls the function [f] and verifies that it throws an exception.
/// The optional [check] function can provide additional validation that the
/// correct exception is being thrown.
/// @description Checks that a function being checked can throw arbitrary value, 
/// possibly not assignable to Exception. 
/// Testing with functions that throw null, String and Object.
/// @author rodionov
/// @author varlax

import "../../../Utils/expect.dart";

typedef bool checkFn(exception);

void badboy() {
  throw "hello!";
}

void badboy2() {
  throw new Object();
}

void badboy3() {
  throw (null as dynamic);
}

main() {
  Expect.throws(badboy);
  Expect.throws(badboy, null,"not empty");

  Expect.throws(badboy, (e) => true);
  check(badboy, (e) => false, "not empty");

  Expect.throws(badboy2);
  Expect.throws(badboy2, (e) => true, "34324");
  check(badboy2, (e) => false);

  Expect.throws(badboy3);
  Expect.throws(badboy3, (e) => e is NullThrownError, "");
  check(badboy3, (e) => false, "not empty");
}

void check(void f(), [checkFn? ch = null, String? reason = null]) {
  try {
    Expect.throws(f, ch, reason);
    throw new Exception("ExpectException expected");
  } on ExpectException catch(e) {
  }
}