ValidatorTesterTester.cs

#region License

// Copyright (c) .NET Foundation and contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// The latest version of this file can be found at https://github.com/FluentValidation/FluentValidation

#endregion

namespace FluentValidation.Tests {
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using Xunit;
	using TestHelper;
	using Validators;
	using System.Threading.Tasks;

	public class ValidatorTesterTester {
		private TestValidator validator;

		public ValidatorTesterTester() {
			validator = new TestValidator();
			validator.RuleFor(x => x.Forename).NotNull();
			validator.RuleForEach(person => person.NickNames).MinimumLength(5);
			CultureScope.SetDefaultCulture();
		}

		[Fact]
		public void ShouldHaveValidationError_should_not_throw_when_there_are_validation_errors_ruleforeach() {
			var person = new Person {NickNames = new[] {"magician", "bull"}};
			validator.TestValidate(person).ShouldHaveValidationErrorFor(l => l.NickNames);
		}

		[Fact]
		public void ShouldHaveValidationError_should_throw_when_there_are_not_validation_errors_ruleforeach() {
			var person = new Person {NickNames = new[] {"magician", "awesome"}};

			ValidationTestException validationTestException = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(person).ShouldHaveValidationErrorFor(l => l.NickNames));

			Assert.Contains(nameof(Person.NickNames), validationTestException.Message);
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_not_throw_when_there_are_not_validation_errors_ruleforeach() {
			var person = new Person {NickNames = new[] {"magician", "awesome"}};
			validator.TestValidate(person).ShouldNotHaveValidationErrorFor(l => l.NickNames);
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_throw_when_there_are_validation_errors_ruleforeach() {
			var person = new Person {NickNames = new[] {"magician", "bull"}};

			ValidationTestException validationTestException = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(person).ShouldNotHaveValidationErrorFor(l => l.NickNames));

			Assert.Contains(nameof(Person.NickNames), validationTestException.Message);
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_have_validation_error_details_when_thrown_ruleforeach() {
			var person = new Person {NickNames = new[] {"magician", "bull"}};
			ValidationTestException validationTestException = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(person).ShouldNotHaveValidationErrorFor(l => l.NickNames));
			Assert.Contains("The length of 'Nick Names' must be at least 5 characters. You entered 4 characters.", validationTestException.Message);
		}

		[Fact]
		public void ShouldHaveValidationError_should_not_throw_when_there_are_validation_errors() {
			var person = new Person();
			validator.TestValidate(person).ShouldHaveValidationErrorFor(x => x.Forename);
		}

		[Fact]
		public void ShouldHaveValidationError_Should_support_nested_properties() {
			validator.RuleFor(x => x.Address.Line1).NotNull();

			var person = new Person {
				Address = new Address {
					Line1 = null,
				},
			};

			validator.TestValidate(person).ShouldHaveValidationErrorFor(x => x.Address.Line1);
		}

		[Fact]
		public void ShouldNotHaveValidationError_Should_support_nested_properties() {
			validator.RuleFor(x => x.Address.Line1).NotNull();

			var person = new Person {
				Address = new Address {
					Line1 = "anything",
				},
			};

			validator.TestValidate(person).ShouldNotHaveValidationErrorFor(x => x.Address.Line1);
		}

		[Fact]
		public void ShouldHaveValidationError_Should_throw_when_there_are_no_validation_errors() {
			var person = new Person {Forename = "test"};
			Assert.Throws<ValidationTestException>(() => validator.TestValidate(person).ShouldHaveValidationErrorFor(x => x.Forename));
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_not_throw_when_there_are_no_errors() {
			var person = new Person {Forename = "test"};
			validator.TestValidate(person).ShouldNotHaveValidationErrorFor(x => x.Forename);
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_throw_when_there_are_errors() {
			var person = new Person();
			Assert.Throws<ValidationTestException>(() => validator.TestValidate(person).ShouldNotHaveValidationErrorFor(x => x.Forename));
		}

		[Fact]
		public void ShouldHaveValidationError_should_not_throw_when_there_are_errors_with_preconstructed_object() {
			validator.TestValidate(new Person()).ShouldHaveValidationErrorFor(x => x.Forename);
		}

		[Fact]
		public void ShouldHaveValidationError_should_throw_when_there_are_no_validation_errors_with_preconstructed_object() {
			Assert.Throws<ValidationTestException>(() => validator.TestValidate(new Person {Forename = "test"}).ShouldHaveValidationErrorFor(x => x.Forename));
		}

		[Fact]
		public void ShouldNotHAveValidationError_should_not_throw_When_there_are_no_errors_with_preconstructed_object() {
			validator.TestValidate(new Person {Forename = "test"}).ShouldNotHaveValidationErrorFor(x => x.Forename);
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_throw_when_there_are_errors_with_preconstructed_object() {
			Assert.Throws<ValidationTestException>(() => validator.TestValidate(new Person {Forename = null}).ShouldNotHaveValidationErrorFor(x => x.Forename));
		}


		[Fact]
		public void ShouldHaveChildValidator_throws_when_property_does_not_have_child_validator() {
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.ShouldHaveChildValidator(x => x.Address, typeof(AddressValidator))
			);

			ex.Message.ShouldEqual("Expected property 'Address' to have a child validator of type 'AddressValidator.'. Instead found 'none'");
		}


		[Fact]
		public void ShouldHaveChildValidator_should_not_throw_when_property_Does_have_child_validator() {
			validator.RuleFor(x => x.Address).SetValidator(new AddressValidator());
			validator.ShouldHaveChildValidator(x => x.Address, typeof(AddressValidator));
		}

		[Fact]
		public void ShouldHaveChildValidator_should_not_throw_when_property_Does_have_child_validator_and_expecting_a_basetype() {
			validator.RuleFor(x => x.Address).SetValidator(new AddressValidator());
			validator.ShouldHaveChildValidator(x => x.Address, typeof(AbstractValidator<Address>));
		}

		[Fact]
		public void ShouldHaveChildvalidator_throws_when_collection_property_Does_not_have_child_validator() {
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.ShouldHaveChildValidator(x => x.Orders, typeof(OrderValidator))
			);

			ex.Message.ShouldEqual("Expected property 'Orders' to have a child validator of type 'OrderValidator.'. Instead found 'none'");
		}

		[Fact]
		public void ShouldHaveChildValidator_should_throw_when_property_has_a_different_child_validator() {
			validator.RuleFor(x => x.Address).SetValidator(new AddressValidator());
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.ShouldHaveChildValidator(x => x.Address, typeof(OrderValidator))
			);

			ex.Message.ShouldEqual("Expected property 'Address' to have a child validator of type 'OrderValidator.'. Instead found 'AddressValidator'");
		}

		[Fact]
		public void ShouldHaveChildValidator_should_not_throw_when_property_has_collection_validators() {
			validator.RuleForEach(x => x.Orders).SetValidator(new OrderValidator());
			validator.ShouldHaveChildValidator(x => x.Orders, typeof(OrderValidator));
		}

		[Fact]
		public void ShouldHaveChildValidator_works_on_model_level_rules() {
			validator.RuleFor(x => x).SetValidator(new InlineValidator<Person>());
			validator.ShouldHaveChildValidator(x => x, typeof(InlineValidator<Person>));
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_takes_account_of_rulesets() {
			var testValidator = new TestValidator();
			testValidator.RuleSet("Names", () => {
				testValidator.RuleFor(x => x.Surname).NotNull();
				testValidator.RuleFor(x => x.Forename).NotNull();
			});
			testValidator.RuleFor(x => x.Id).NotEqual(0);

			testValidator.TestValidate(new Person(), opt => opt.IncludeRuleSets("Names"))
				.ShouldHaveValidationErrorFor(x => x.Forename);
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_takes_account_of_rulesets_fluent_approach() {
			var testValidator = new TestValidator();
			testValidator.RuleSet("Names", () => {
				testValidator.RuleFor(x => x.Surname).NotNull();
				testValidator.RuleFor(x => x.Forename).NotNull();
			});
			testValidator.RuleFor(x => x.Id).NotEqual(0);

			var assertionRoot = testValidator.TestValidate(new Person(), opt => opt.IncludeRuleSets("Names"));

			assertionRoot.ShouldHaveValidationErrorFor(x => x.Forename)
				.WithErrorCode("NotNullValidator");
			assertionRoot.ShouldHaveValidationErrorFor(x => x.Surname).WithErrorCode("NotNullValidator");
			assertionRoot.ShouldNotHaveValidationErrorFor(x => x.Id);
		}

		[Fact]
		public void Tests_nested_property_using_obsolete_method() {
			var validator = new TestValidator();
			validator.RuleFor(x => x.Address.Line1).NotEqual("foo");

			var result = validator.TestValidate(new Person() {
				Address = new Address {Line1 = "bar"}
			});

			var ex = Assert.Throws<ValidationTestException>(() => {
				result.ShouldHaveValidationErrorFor(x => x.Address.Line1);
			});

			ex.Message.ShouldEqual("Expected a validation error for property Address.Line1");
		}

		[Fact]
		public void Tests_nested_property() {
			var validator = new TestValidator();
			validator.RuleFor(x => x.Address.Line1).NotEqual("foo");

			var result = validator.TestValidate(new Person() {
				Address = new Address {Line1 = "bar"}
			});

			var ex = Assert.Throws<ValidationTestException>(() => {
				result.ShouldHaveValidationErrorFor(x => x.Address.Line1);
			});

			ex.Message.ShouldEqual("Expected a validation error for property Address.Line1");
		}

		[Fact]
		public void Tests_nested_property_reverse() {
			var validator = new TestValidator();
			validator.RuleFor(x => x.Address.Line1).NotEqual("foo");

			var result = validator.TestValidate(new Person() {
				Address = new Address {Line1 = "foo"}
			});

			var ex = Assert.Throws<ValidationTestException>(() => {
				result.ShouldNotHaveValidationErrorFor(x => x.Address.Line1);
			});

			ex.Message.Contains($"Expected no validation errors for property Address.Line1").ShouldBeTrue();
		}

		[Fact]
		public void ShouldHaveValidationError_with_an_unmatched_rule_and_a_single_error_should_throw_an_exception() {
			var validator = new TestValidator();
			validator.RuleFor(x => x.NullableInt).GreaterThanOrEqualTo(3);

			var result = validator.TestValidate(new Person() {
				NullableInt = 1
			});

			var ex = Assert.Throws<ValidationTestException>(() => result.ShouldHaveValidationErrorFor(x => x.NullableInt.Value));
			Assert.Equal("Expected a validation error for property NullableInt.Value\n----\nProperties with Validation Errors:\n[0]: NullableInt\n", ex.Message);
		}

		[Fact]
		public void ShouldHaveValidationError_with_an_unmatched_rule_and_multiple_errors_should_throw_an_exception() {
			var validator = new TestValidator();
			validator.RuleFor(x => x.NullableInt).GreaterThan(1);
			validator.RuleFor(x => x.Age).GreaterThan(1);
			validator.RuleFor(x => x.AnotherInt).GreaterThan(2);

			var result = validator.TestValidate(new Person() {
				NullableInt = 1,
				Age = 1,
				AnotherInt = 1
			});

			var ex = Assert.Throws<ValidationTestException>(() => result.ShouldHaveValidationErrorFor(x => x.NullableInt.Value));
			Assert.Equal("Expected a validation error for property NullableInt.Value\n----\nProperties with Validation Errors:\n[0]: NullableInt\n[1]: Age\n[2]: AnotherInt\n", ex.Message);
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_correctly_handle_explicitly_providing_object_to_validate() {
			var unitOfMeasure = new UnitOfMeasure {
				Value = 1,
				Type = 43
			};

			var validator = new UnitOfMeasureValidator();

			validator.TestValidate(unitOfMeasure).ShouldNotHaveValidationErrorFor(unit => unit.Type);
		}

		[Fact]
		public void ShouldNotHaveValidationError_should_correctly_handle_explicitly_providing_object_to_validate_and_other_property_fails_validation() {
			var validator = new Address2Validator();
			validator.RuleFor(x => x.StreetNumber).Equal("foo");

			var address = new Address2 {
				StreetNumber = "a",
				Street = "b"
			};

			validator.TestValidate(address).ShouldNotHaveValidationErrorFor(a => a.Street);
		}

		[Fact]
		public void ShouldHaveValidationError_preconstructed_object_does_not_throw_for_unwritable_property() {
			validator.RuleFor(x => x.ForenameReadOnly).NotNull();
			validator.TestValidate(new Person {Forename = null}).ShouldHaveValidationErrorFor(x => x.ForenameReadOnly);
		}

		[Fact]
		public void Expected_message_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull().WithMessage("bar")
			};

			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithErrorMessage("foo"));
			ex.Message.ShouldEqual("Expected an error message of 'foo'. Actual message was 'bar'");
		}

		[Theory]
		[InlineData("bar", new string[] { "foo", "bar" })]
		[InlineData("bar", new string[] { "bar", })]
		public void Unexpected_message_check(string withoutErrMsg, string[] errMessages) {
			var validator = new InlineValidator<Person>();
			foreach (var msg in errMessages) {
				validator.Add(v => v.RuleFor(x => x.Surname).NotNull().WithMessage(msg));
			}

			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person { }).ShouldHaveAnyValidationError().WithoutErrorMessage(withoutErrMsg));
			ex.Message.ShouldEqual($"Found an unexpected error message of '{withoutErrMsg}'");
		}

		[Fact]
		public void Expected_message_argument_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname)
					.Must((x, y, context) => {
						context.MessageFormatter.AppendArgument("Foo", "bar");
						return false;
					})
					.WithMessage("{Foo}")
				};
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithMessageArgument("Foo", "foo")
			);
			ex.Message.ShouldEqual("Expected message argument 'Foo' with value 'foo'. Actual value was 'bar'");
		}

		[Fact]
		public void Expected_state_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull().WithState(x => "bar")
			};
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithCustomState("foo"));
			ex.Message.ShouldEqual("Expected custom state of 'foo'. Actual state was 'bar'");
		}

		[Fact]
		public void Unexpected_state_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull().WithState(x => "bar"),
				v => v.RuleFor(x => x.Surname).NotNull().WithState(x => "foo"),
			};
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithoutCustomState("bar"));
			ex.Message.ShouldEqual("Found an unexpected custom state of 'bar'");
		}

		[Fact]
		public void Test_custom_state_with_concatenated_string() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).NotNull().WithState(x => "Test" + 123);
			var result = validator.TestValidate(new Person());

			// String concatenated with integer means a different string reference is created:
			/*
				object s1 = "Test" + 123.ToString();
				object s2 = "Test123";
				bool check1 = s1 == s2; // False
			 */
			// Test to ensure that this scenario is handled properly.
			result.ShouldHaveValidationErrorFor(x => x.Surname)
				.WithCustomState("Test123");
		}

		[Fact]
		public void Custom_state_comparer_check() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).NotNull().WithState(x => "Test" + 123);
			var result = validator.TestValidate(new Person());

			// Throws without comparer.
			Assert.Throws<ValidationTestException>(() => {
				result.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithCustomState("test123");
			});

			// Doesn't throw with comparer.
			result.ShouldHaveValidationErrorFor(x => x.Surname)
				.WithCustomState("test123", StringComparer.OrdinalIgnoreCase);
		}

		[Fact]
		public void Expected_error_code_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull().WithErrorCode("bar")
			};
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithErrorCode("foo"));
			ex.Message.ShouldEqual("Expected an error code of 'foo'. Actual error code was 'bar'");
		}

		[Fact]
		public void Unexpected_error_code_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull().WithErrorCode("bar"),
				v => v.RuleFor(x => x.Surname).NotNull().WithErrorCode("foo")
			};
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithoutErrorCode("bar"));
				ex.Message.ShouldEqual("Found an unexpected error code of 'bar'");
		}

		[Fact]
		public void Unexpected_without_error_code_check() {
			//#1937
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull(),
				v => v.RuleFor(x => x.Forename).NotNull()
			};

			validator.TestValidate(new Person())
				.ShouldHaveValidationErrorFor(x => x.Surname)
				.WithoutErrorCode("foo")
				.WithoutErrorMessage("bar")
				.WithoutSeverity(Severity.Warning)
				.WithoutCustomState(1);
		}

		[Fact]
		public void Expected_severity_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull().WithSeverity(Severity.Warning)
			};

			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithSeverity(Severity.Error));

			ex.Message.ShouldEqual($"Expected a severity of '{nameof(Severity.Error)}'. Actual severity was '{nameof(Severity.Warning)}'");
		}

		[Fact]
		public void Unexpected_severity_check() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotNull().WithSeverity(Severity.Warning),
				v => v.RuleFor(x => x.Surname).NotNull().WithSeverity(Severity.Error),
			};
			var ex = Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithoutSeverity(Severity.Warning));

			ex.Message.ShouldEqual($"Found an unexpected severity of '{nameof(Severity.Warning)}'");
		}

		[Theory]
		[InlineData(42, null)]
		[InlineData(42, "")]
		public async Task ShouldHaveValidationError_should_not_throw_when_there_are_validation_errors__WhenAsyn_is_used(int age, string cardNumber) {
			Person testPerson = new Person() {
				CreditCard = cardNumber,
				Age = age
			};

			validator.RuleFor(x => x.CreditCard)
				.Must(creditCard => !string.IsNullOrEmpty(creditCard))
				.WhenAsync((x, cancel) => Task.FromResult(x.Age >= 18));

			// Throws when called sync.
			Assert.Throws<AsyncValidatorInvokedSynchronouslyException>(() =>
				validator.TestValidate(testPerson).ShouldHaveValidationErrorFor(x => x.CreditCard));

			(await validator.TestValidateAsync(testPerson)).ShouldHaveValidationErrorFor(x => x.CreditCard);
		}

		[Theory]
		[InlineData(42, "cardNumber")]
		[InlineData(17, null)]
		[InlineData(17, "")]
		[InlineData(17, "cardNumber")]
		public void ShouldHaveValidationError_should_throw_when_there_are_not_validation_errors__WhenAsyn_Is_Used(int age, string cardNumber) {
			Person testPerson = new Person() {
				CreditCard = cardNumber,
				Age = age
			};

			Assert.Throws<ValidationTestException>(() => validator.TestValidate(testPerson).ShouldHaveValidationErrorFor(x => x.CreditCard));
		}

		[Theory]
		[InlineData(42, "cardNumber")]
		[InlineData(17, null)]
		[InlineData(17, "")]
		[InlineData(17, "cardNumber")]
		public void ShouldNotHaveValidationError_should_throw_when_there_are_not_validation_errors__WhenAsyn_is_used(int age, string cardNumber) {
			Person testPerson = new Person() {
				CreditCard = cardNumber,
				Age = age
			};

			validator.TestValidate(testPerson)
				.ShouldNotHaveValidationErrorFor(x => x.CreditCard);
		}

		[Theory]
		[InlineData(42, null)]
		[InlineData(42, "")]
		public async Task ShouldNotHaveValidationError_should_throw_when_there_are_validation_errors__WhenAsyn_is_used(int age, string cardNumber) {
			Person testPerson = new Person() {
				CreditCard = cardNumber,
				Age = age
			};

			validator.RuleFor(x => x.CreditCard)
				.Must(creditCard => !string.IsNullOrEmpty(creditCard))
				.WhenAsync((x, cancel) => Task.FromResult(x.Age >= 18));

			// Throws async exception when invoked synchronously
			Assert.Throws<AsyncValidatorInvokedSynchronouslyException>(() => validator.TestValidate(testPerson).ShouldNotHaveValidationErrorFor(x => x.CreditCard));

			// Executes normally when run async.
			await Assert.ThrowsAsync<ValidationTestException>(async () =>
				(await validator.TestValidateAsync(testPerson)).ShouldNotHaveValidationErrorFor(x => x.CreditCard));
		}

		[Fact]
		public void ShouldHaveChildValidator_should_work_with_DependentRules() {
			var validator = new InlineValidator<Person>();

			validator.RuleFor(x => x.Children)
				.NotNull().When(p => true)
				.DependentRules(() => {
					validator.RuleForEach(p => p.Children).SetValidator(p => new InlineValidator<Person>());
				});

			validator.ShouldHaveChildValidator(x => x.Children, typeof(InlineValidator<Person>));
		}

		[Fact]
		public void Allows_only_one_failure_to_match() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).Equal("a").WithErrorCode("nota"),
				v => v.RuleFor(x => x.Surname).Equal("b").WithErrorCode("notb")
			};

			var person = new Person() { Surname = "c" };
			var result = validator.TestValidate(person);

			result.ShouldHaveAnyValidationError().WithErrorCode("nota");
			result.ShouldHaveAnyValidationError().WithErrorCode("notb");
		}

		[Fact]
		public void Matches_any_failure() {
			var validator = new InlineValidator<Person> {
				v => v.RuleFor(x => x.Surname).NotEqual("foo"),
			};

			var resultWithFailure = validator.TestValidate(new Person { Surname = "foo"});
			var resultWithoutFailure = validator.TestValidate(new Person { Surname = ""});

			Assert.Throws<ValidationTestException>(() => resultWithoutFailure.ShouldHaveAnyValidationError());
			Assert.Throws<ValidationTestException>(() => resultWithFailure.ShouldNotHaveAnyValidationErrors());

			// Neither should throw.
			resultWithFailure.ShouldHaveAnyValidationError();
			resultWithoutFailure.ShouldNotHaveAnyValidationErrors();
		}

		[Fact]
		public void Model_level_check_fails_if_no_model_level_failures() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).Must(x => false);
			var result = validator.TestValidate(new Person());

			Assert.Throws<ValidationTestException>(() => {
				result.ShouldHaveValidationErrorFor(x => x);
			});

			Assert.Throws<ValidationTestException>(() => {
				result.ShouldHaveValidationErrorFor("");
			});
		}

		[Fact]
		public void Matches_model_level_rule() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x).Must(x => false);
			validator.RuleFor(x => x.Surname).Must(x => false);

			var result = validator.TestValidate(new Person());
			result.ShouldHaveValidationErrorFor(x => x);
			result.ShouldHaveValidationErrorFor("");
		}

		[Fact]
		public void Can_use_indexer_in_string_message() {
			var validator = new InlineValidator<Person>();
			var orderValidator = new InlineValidator<Order>();
			orderValidator.RuleFor(x => x.ProductName).NotNull();
			validator.RuleForEach(x => x.Orders).SetValidator(orderValidator);

			var model = new Person { Orders = new List<Order> { new Order() }};
			var result = validator.TestValidate(model);
			result.ShouldHaveValidationErrorFor("Orders[0].ProductName");
		}

		[Fact]
		public void Can_use_indexer_in_string_message_inverse() {
			var validator = new InlineValidator<Person>();
			var orderValidator = new InlineValidator<Order>();
			orderValidator.RuleFor(x => x.ProductName).Null();
			validator.RuleForEach(x => x.Orders).SetValidator(orderValidator);

			var model = new Person { Orders = new List<Order> { new Order() }};
			var result = validator.TestValidate(model);
			result.ShouldNotHaveValidationErrorFor("Orders[0].ProductName");
		}

		[Fact]
		public async Task TestValidate_runs_async() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			var result = await validator.TestValidateAsync(new Person());
			result.ShouldHaveValidationErrorFor(x => x.Surname);
		}

		[Fact]
		public async Task TestValidate_runs_async_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			var result = await validator.TestValidateAsync(new Person());
			Assert.Throws<ValidationTestException>(() => {
				result.ShouldNotHaveValidationErrorFor(x => x.Surname);
			});
		}

		[Fact]
		public async Task ShouldHaveValidationError_async() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			(await validator.TestValidateAsync(new Person())).ShouldHaveValidationErrorFor(x => x.Surname);
		}

		[Fact]
		public async Task ShouldHaveValidationError_async_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(true));
			await Assert.ThrowsAsync<ValidationTestException>(async () => {
				(await validator.TestValidateAsync(new Person())).ShouldHaveValidationErrorFor(x => x.Surname);
			});
		}

		[Fact]
		public async Task ShouldNotHaveValidationError_async() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(true));
			(await validator.TestValidateAsync(new Person())).ShouldNotHaveValidationErrorFor(x => x.Surname);
		}

		[Fact]
		public async Task ShouldNotHaveValidationError_async_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			await Assert.ThrowsAsync<ValidationTestException>(async () => {
				(await validator.TestValidateAsync(new Person())).ShouldNotHaveValidationErrorFor(x => x.Surname);
			});
		}

		[Fact]
		public async Task ShouldHaveValidationError_model_async() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			(await validator.TestValidateAsync(new Person())).ShouldHaveValidationErrorFor(x => x.Surname);
		}

		[Fact]
		public async Task ShouldHaveValidationError_model_async_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(true));
			await Assert.ThrowsAsync<ValidationTestException>(async () => {
				(await validator.TestValidateAsync(new Person())).ShouldHaveValidationErrorFor(x => x.Surname);
			});
		}

		[Fact]
		public async Task ShouldNotHaveValidationError_model_async() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(true));
			(await validator.TestValidateAsync(new Person())).ShouldNotHaveValidationErrorFor(x => x.Surname);
		}

		[Fact]
		public async Task ShouldNotHaveValidationError_async_model_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			await Assert.ThrowsAsync<ValidationTestException>(async () => {
				(await validator.TestValidateAsync(new Person())).ShouldNotHaveValidationErrorFor(x => x.Surname);
			});
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_Only() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).Must((x, ct) => false);
			validator.TestValidate(new Person())
				.ShouldHaveValidationErrorFor(x => x.Surname)
				.Only();
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_Only_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).Must((x, ct) => false);
			validator.RuleFor(x => x.Age).Must((x, ct) => false);
			Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.Only()
			).Message.ShouldEqual("Expected to have errors only matching specified conditions\n----\nUnexpected Errors:\n[0]: The specified condition was not met for 'Age'.\n");
		}

		[Fact]
		public async Task ShouldHaveValidationErrorFor_Only_async() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			(await validator.TestValidateAsync(new Person()))
				.ShouldHaveValidationErrorFor(x => x.Surname)
				.Only();
		}

		[Fact]
		public async Task ShouldHaveValidationErrorFor_Only_async_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname).MustAsync((x, ct) => Task.FromResult(false));
			validator.RuleFor(x => x.Age).MustAsync((x, ct) => Task.FromResult(false));
			(await Assert.ThrowsAsync<ValidationTestException>(async () => {
				(await validator.TestValidateAsync(new Person()))
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.Only();
			})).Message.ShouldEqual("Expected to have errors only matching specified conditions\n----\nUnexpected Errors:\n[0]: The specified condition was not met for 'Age'.\n");
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithMultipleRules_Only() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname)
				.Must((x, ct) => false)
				.NotEmpty();
			validator.TestValidate(new Person())
				.ShouldHaveValidationErrorFor(x => x.Surname)
				.Only();
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithMessage_Only_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname)
				.Must((x, ct) => false)
				.NotEmpty();
			Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithErrorMessage("The specified condition was not met for 'Surname'.")
					.Only()
			).Message.ShouldEqual("Expected to have errors only matching specified conditions\n----\nUnexpected Errors:\n[0]: 'Surname' must not be empty.\n");
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithMessage_Only() {
			var validator = new InlineValidator<Person>();
			var message = "Something's wrong but I won't tell you what";
			validator.RuleFor(x => x.Surname)
				.Must((x, ct) => false).WithMessage(message)
				.NotEmpty().WithMessage(message);
			validator.TestValidate(new Person())
				.ShouldHaveValidationErrorFor(x => x.Surname)
				.WithErrorMessage(message)
				.Only();
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithSeverity_Only() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname)
				.Must((x, ct) => false).WithSeverity(Severity.Warning)
				.NotEmpty().WithSeverity(Severity.Warning);
			validator.TestValidate(new Person())
				.ShouldHaveValidationErrorFor(x => x.Surname)
				.WithSeverity(Severity.Warning)
				.Only();
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithSeverity_Only_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname)
				.Must((x, ct) => false).WithSeverity(Severity.Warning)
				.NotEmpty();
			Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithSeverity(Severity.Warning)
					.Only()
			).Message.ShouldEqual("Expected to have errors only matching specified conditions\n----\nUnexpected Errors:\n[0]: 'Surname' must not be empty.\n");
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithErrorCode_Only() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname)
				.Must((x, ct) => false).WithErrorCode("100")
				.NotEmpty().WithErrorCode("100");
			validator.TestValidate(new Person())
				.ShouldHaveValidationErrorFor(x => x.Surname)
				.WithErrorCode("100")
				.Only();
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithErrorCode_Only_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => x.Surname)
				.Must((x, ct) => false).WithErrorCode("100")
				.NotEmpty().WithErrorCode("200");
			Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor(x => x.Surname)
					.WithErrorCode("100")
					.Only()
			).Message.ShouldEqual("Expected to have errors only matching specified conditions\n----\nUnexpected Errors:\n[0]: 'Surname' must not be empty.\n");
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithPropertyName_Only() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => DateTime.Now)
				.Must((x, ct) => false);
			validator.TestValidate(new Person())
				.ShouldHaveValidationErrorFor("Now")
				.WithErrorMessage("The specified condition was not met for 'Now'.")
				.Only();
		}

		[Fact]
		public void ShouldHaveValidationErrorFor_WithPropertyName_Only_throws() {
			var validator = new InlineValidator<Person>();
			validator.RuleFor(x => DateTime.Now)
				.Must((x, ct) => false)
				.LessThan(new DateTime(1900, 1, 1));
			Assert.Throws<ValidationTestException>(() =>
				validator.TestValidate(new Person())
					.ShouldHaveValidationErrorFor("Now")
					.WithErrorMessage("The specified condition was not met for 'Now'.")
					.Only()
			).Message.ShouldEqual("Expected to have errors only matching specified conditions\n----\nUnexpected Errors:\n[0]: 'Now' must be less than '1/1/1900 12:00:00 AM'.\n");
		}

		private class AddressValidator : AbstractValidator<Address> {
		}

		private class OrderValidator : AbstractValidator<Order> {
		}

		public class UnitOfMeasure {
			public int Value { get; set; }
			public int? Type { get; set; }
		}


		public class UnitOfMeasureValidator : AbstractValidator<UnitOfMeasure> {
			public UnitOfMeasureValidator() {
				RuleFor(unit => unit.Value).GreaterThanOrEqualTo(0);

				RuleFor(unit => unit.Type).NotNull()
					.When(unit => unit.Value > 0)
					.WithMessage("If a unit of measure's 'Value' is provided, then a 'Type' also needs to be provided.");
			}
		}

		public class Address2 {
			public string StreetNumber { get; set; }
			public string Street { get; set; }
		}

		public class Address2Validator : InlineValidator<Address2> {
			public static string RuleLocationNames = "LocationNames";

			public Address2Validator() {
				// Cannot have a street number/lot and no street name.
				RuleFor(address => address.Street)
					.NotNull()
					.When(address => !string.IsNullOrWhiteSpace(address.StreetNumber))
					.WithMessage("A street name is required when a street number has been provided. Eg. Smith Street.");
			}
		}
	}
}