Examples/GerstITS.Examples.Tests/Customers/Validation/CustomerValidationRuleTest.cs

using AwesomeAssertions;
using GerstITS.Examples.Logic.Customers;
using GerstITS.Examples.Logic.Customers.Validation;
using GerstITS.TestFramework;
using Xunit;

namespace GerstITS.Examples.Tests.Customers.Validation;

[TestCategory(TestCategories.Unit)]
public sealed class CustomerValidationRuleTest
{
    #region Tests

    [Fact]
    public void If_a_customer_is_complete___It_is_valid()
    {
        var customer = CreateCustomer();

        var result = new CustomerValidationRule().Validate((object)customer);

        result.IsValid.Should().BeTrue();
    }

    [Fact]
    public void If_the_first_name_is_missing___It_is_invalid()
    {
        var customer = CreateCustomer();
        customer.FirstName = string.Empty;

        var result = new CustomerValidationRule().Validate((object)customer);

        result.IsValid.Should().BeFalse();
    }

    [Fact]
    public void If_the_email_has_no_valid_format___It_is_invalid()
    {
        var customer = CreateCustomer();
        customer.EMail = "not-an-email";

        var result = new CustomerValidationRule().Validate((object)customer);

        result.IsValid.Should().BeFalse();
    }

    [Fact]
    public void If_a_customer_type_is_checked___It_can_be_validated()
    {
        new CustomerValidationRule().CanValidate(typeof(Customer)).Should().BeTrue();
    }

    #endregion

    #region Methods

    private static Customer CreateCustomer()
    {
        return new Customer
               {
                   FirstName = "Erika",
                   LastName = "Mustermann",
                   EMail = "erika.mustermann@example.com"
               };
    }

    #endregion
}