public void DataErrorInfoShouldGetErrorsFromValidators() { ValidatableViewModel viewModel = GetValidatableViewModel(); IDataErrorInfo dataErrorInfo = viewModel; var validator = viewModel.AddValidator <SpyValidator>(viewModel); IDataErrorInfo validatorErrorInfo = validator; validator.SetErrors(PropToValidate1, PropToValidate1); viewModel.OnPropertyChanged(PropToValidate1, ExecutionType.None); string error = dataErrorInfo[PropToValidate1]; validator.ValidateCount.ShouldEqual(1); validator.ValidateProperties.Contains(PropToValidate1).ShouldBeTrue(); error.ShouldEqual(PropToValidate1); validator.SetErrors(PropToValidate1); viewModel.OnPropertyChanged(PropToValidate1, ExecutionType.None); error = validatorErrorInfo[PropToValidate1]; validator.ValidateCount.ShouldEqual(2); error.ShouldBeNull(); }