AgeVerificationTest.cs

public class AgeVerificationTest
{
    private readonly AgeVerification _obj = new();

    [Fact]
    public void NotOver18()
    {
        var result = _obj.Is18YearsOrOlder(new DateTime(2006, 10, 22));
        result.ShouldBe(false);
    }
    
    [Fact]
    public void Over18()
    {
        var result = _obj.Is18YearsOrOlder(new DateTime(2006, 10, 20));
        result.ShouldBe(true);
    }
    
    [Fact]
    public void NotOver18_2()
    {
        var result = _obj.Is18YearsOrOlder(DateTime.UtcNow.AddYears(-18).AddDays(1));
        result.ShouldBe(false);
    }
    
    [Fact]
    public void Over18_2()
    {
        var result = _obj.Is18YearsOrOlder(DateTime.UtcNow.AddYears(-18).AddDays(-1));
        result.ShouldBe(true);
    }
}