Language/Expressions/Throw/evaluation_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 Evaluation of a throw expression of the form throw e; proceeds as
/// follows:
/// The expression e is evaluated yielding a value v.
/// If v evaluates to null, then a NullThrownError is thrown. Otherwise, control
/// is transferred to the nearest dynamically enclosing exception handler, with
/// the current exception set to v and the current return value becomes
/// undefined.
/// @description Checks that an expression statement of the form "throw e;"
/// indeed raises an exception and transfers control to the nearest enclosing
/// exception handler if there is one.
/// @author rodionov

import '../../../Utils/expect.dart';

main() {
  bool flag = false;
  var ex = "";
  try {
    foo() {
      try {
        throw ex;
        Expect.fail("This code shouldn't be executed");
      } on int catch (i) {}
      Expect.fail("This code shouldn't be executed");
    }
    foo();
    Expect.fail("This code shouldn't be executed");
  } on int catch (i) {
  } catch (s, st) {
    flag = true;
    Expect.isTrue(identical(ex, s));
    Expect.isNotNull(st);
  }

  Expect.isTrue(flag, "The correct exception handler wasn't triggered");
}