How can I perform integration testing with FluentValidation?

How can I perform integration testing with FluentValidation?

To perform integration testing with FluentValidation, you can create test cases that validate your models against the rules defined in your validators.

Can you show me a code example for that?

Sure! You can use a testing framework like xUnit along with FluentValidation. Here's a simple example:

public class UserValidator : AbstractValidator<User>
{
    public UserValidator()
    {
        RuleFor(user => user.Email).EmailAddress();
        RuleFor(user => user.Age).GreaterThan(18);
    }
}

public class UserValidatorTests
{
    [Fact]
    public void Should_Have_Error_When_Email_Is_Invalid()
    {
        var validator = new UserValidator();
        var user = new User { Email = "invalid-email", Age = 20 };
        var result = validator.Validate(user);
        Assert.False(result.IsValid);
        Assert.Equal("Email is not valid.", result.Errors[0].ErrorMessage);
    }
}

This tests if the email validation works correctly.

What if I want to test multiple validation rules?

You can add multiple assertions in your test method. For example, you can create a user with an invalid email and age, and then check for both errors in the result.