angular-cn/modules/angular2/test/facade/async_dart_spec.dart

/// This file contains tests that make sense only in Dart
library angular2.test.facade.async_dart_spec;

import 'package:angular2/test_lib.dart';
import 'package:angular2/src/facade/async.dart';

class MockException implements Error {
  var message;
  var stackTrace;
}
class NonError {
  var message;
}

void functionThatThrows() {
  try {
    throw new MockException();
  } catch (e, stack) {
    // If we lose the stack trace the message will no longer match
    // the first line in the stack
    e.message = stack.toString().split('\n')[0];
    e.stackTrace = stack;
    rethrow;
  }
}

void functionThatThrowsNonError() {
  try {
    throw new NonError();
  } catch (e, stack) {
    // If we lose the stack trace the message will no longer match
    // the first line in the stack
    e.message = stack.toString().split('\n')[0];
    rethrow;
  }
}

void expectFunctionThatThrowsWithStackTrace(
    Future future, AsyncTestCompleter async) {
  PromiseWrapper.catchError(future, (err, StackTrace stack) {
    expect(stack.toString().split('\n')[0]).toEqual(err.message);
    async.done();
  });
}

main() {
  describe('async facade', () {
    describe('Completer', () {
      it('should preserve Error stack traces', inject([AsyncTestCompleter],
          (async) {
        var c = PromiseWrapper.completer();

        expectFunctionThatThrowsWithStackTrace(c.promise, async);

        try {
          functionThatThrows();
        } catch (e) {
          c.reject(e, null);
        }
      }));

      it('should preserve error stack traces for non-Errors', inject(
          [AsyncTestCompleter], (async) {
        var c = PromiseWrapper.completer();

        expectFunctionThatThrowsWithStackTrace(c.promise, async);

        try {
          functionThatThrowsNonError();
        } catch (e, s) {
          c.reject(e, s);
        }
      }));
    });

    describe('PromiseWrapper', () {
      describe('reject', () {
        it('should preserve Error stack traces', inject([AsyncTestCompleter],
            (async) {
          try {
            functionThatThrows();
          } catch (e) {
            var rejectedFuture = PromiseWrapper.reject(e, null);
            expectFunctionThatThrowsWithStackTrace(rejectedFuture, async);
          }
        }));

        it('should preserve stack traces for non-Errors', inject(
            [AsyncTestCompleter], (async) {
          try {
            functionThatThrowsNonError();
          } catch (e, s) {
            var rejectedFuture = PromiseWrapper.reject(e, s);
            expectFunctionThatThrowsWithStackTrace(rejectedFuture, async);
          }
        }));
      });
    });
  });
}