public async void FieldNChar_Create_length() { Mock <ITestAllFieldTypesNullableRepository> testAllFieldTypesNullableRepository = new Mock <ITestAllFieldTypesNullableRepository>(); testAllFieldTypesNullableRepository.Setup(x => x.Get(It.IsAny <int>())).Returns(Task.FromResult(new TestAllFieldTypesNullable())); var validator = new ApiTestAllFieldTypesNullableServerRequestModelValidator(testAllFieldTypesNullableRepository.Object); await validator.ValidateCreateAsync(new ApiTestAllFieldTypesNullableServerRequestModel()); validator.ShouldHaveValidationErrorFor(x => x.FieldNChar, new string('A', 11)); }