public void DomainContext_Submit_ErrorsClearOnReject()
        {
            int refZip = 0;
            CityDomainContext citiesProvider = new CityDomainContext(TestURIs.Cities);

            SubmitOperation so = null;
            LoadOperation lo = citiesProvider.Load(citiesProvider.GetZipsQuery(), false);

            // wait for Load to complete, then invoke domain method that throws on server. Submit.
            EnqueueConditional(() => lo.IsComplete);
            EnqueueCallback(delegate
            {
                // invoke methods that cause exception
                Zip[] zips = citiesProvider.Zips.ToArray();
                zips[0].ThrowException("ValidationException");
                so = citiesProvider.SubmitChanges(TestHelperMethods.DefaultOperationAction, null);
            });

            // wait for submitted event being fired and verify Entity.ValidationErrors is not empty
            EnqueueConditional(() => so.IsComplete);
            EnqueueCallback(delegate
            {
                DomainOperationException ex = so.Error as DomainOperationException;
                Assert.IsNotNull(ex);

                Zip zip = citiesProvider.Zips.First();
                IEnumerable<ValidationResult> errors = zip.ValidationErrors;
                LogErrorListContents("zips[0].ValidationErrors", errors);
                Assert.AreEqual(1, errors.Count());

                // Verify that failed submission does not clear out the last invocation
                Assert.IsFalse(zip.CanThrowException);
                Assert.IsTrue(zip.EntityActions.Any(a => a.Name == "ThrowException"));

                // Add a custom validation error to ensure it gets cleared
                zip.ValidationErrors.Add(new ValidationResult("Temporary Error"));

                // Call RejectChanges and verify ValidationErrors collection is cleared
                citiesProvider.RejectChanges();
                Assert.IsFalse(zip.ValidationErrors.Any());

                // Invoke domain method that does not throw on same entity
                zip.ReassignZipCode(1, true);
                refZip = zip.Code;
                so = citiesProvider.SubmitChanges(TestHelperMethods.DefaultOperationAction, null);
            });

            // wait for submitted event being fired and verify Entity.ValidationErrors remains empty
            EnqueueConditional(() => so.IsComplete);
            EnqueueCallback(delegate
            {
                Zip zip = citiesProvider.Zips.First();
                Assert.IsNull(so.Error);
                Assert.IsFalse(zip.ValidationErrors.Any());
                Assert.AreEqual(refZip + 1, zip.Code);
            });

            EnqueueTestComplete();
        }