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CommonHelperEmailValidatorTests.cs

using FluentAssertions;
using Nop.Core;
using NUnit.Framework;

namespace Nop.Tests.Nop.Core.Tests;

[TestFixture]
public class CommonHelperEmailValidatorTests
{
    [Test]
    public void WhenTheTextIsAValidEmailAddressThenTheValidatorShouldPass()
    {
        var email = "testperson@gmail.com";
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeTrue();
    }

    [Test]
    public void WhenTheTextIsAValidEmailAddressIncludingPlusValidatorShouldPass()
    {
        var email = "testperson+label@gmail.com";
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeTrue();
    }

    [Test]
    public void WhenTheTextIsNullThenTheValidatorShouldFail()
    {
        var result = CommonHelper.IsValidEmail(null);
        result.Should().BeFalse();
    }

    [Test]
    public void WhenTheTextIsEmptyThenTheValidatorShouldFail()
    {
        var email = string.Empty;
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeFalse();
    }

    [Test]
    public void WhenTheTextIsNotAValidEmailAddressThenTheValidatorShouldFail()
    {
        const string email = "testperso";
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeFalse();
    }

    [Test]
    public void ThisShouldNotHang()
    {
        const string email = "thisisaverylongstringcodeplex.com";
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeFalse();
    }

    [Test]
    public void WhenEmailAddressContainsUpperCasesThenTheValidatorShouldPass()
    {
        var email = "testperson@gmail.com";
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeTrue();

        email = "TestPerson@gmail.com";
        result = CommonHelper.IsValidEmail(email);
        result.Should().BeTrue();
    }

    [Test]
    public void WhenEmailAddressContainsHyphenInDomainThenTheValidatorShouldPass()
    {
        //underscore is not allowed in domain part 
        var email = "testperson@domain_with-hyphen.com";
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeFalse();

        email = "testperson@example-domain.net";
        result = CommonHelper.IsValidEmail(email);
        result.Should().BeTrue();
    }

    [Test]
    public void WhenEmailAddressContainsDifferentTLDsThenTheValidatorShouldPass()
    {
        var email = "testperson@example.co.uk";
        var result = CommonHelper.IsValidEmail(email);
        result.Should().BeTrue();

        email = "testperson@example.museum";
        result = CommonHelper.IsValidEmail(email);
        result.Should().BeTrue();
    }
}