WildPlumProject/WildPlumTests/DataModelTests/ProductDataModelTests.cs

using WildPlumContracts.DataModels;
using WildPlumContracts.Exceptions;

namespace WildPlumTests.DataModelTests;

[TestFixture]
public class ProductDataModelTests
{
    [Test]
    public void Validate_ThrowsException_WhenIdIsNullOrEmpty()
    {
        Assert.Multiple(() =>
        {
            Assert.That(() => CreateDataModel(null, "Laptop", 1000, false).Validate(),
                Throws.TypeOf<ValidationException>());

            Assert.That(() => CreateDataModel(string.Empty, "Laptop", 1000, false).Validate(),
                Throws.TypeOf<ValidationException>());
        });
    }

    [Test]
    public void Validate_ThrowsException_WhenIdIsNotGuid()
    {
        Assert.That(() => CreateDataModel("invalid-guid", "Laptop", 1000, false).Validate(),
            Throws.TypeOf<ValidationException>());
    }

    [Test]
    public void Validate_ThrowsException_WhenProductNameIsNullOrEmpty()
    {
        Assert.Multiple(() =>
        {
            Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), null, 1000, false).Validate(),
                Throws.TypeOf<ValidationException>());

            Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), string.Empty, 1000, false).Validate(),
                Throws.TypeOf<ValidationException>());
        });
    }

    [Test]
    public void Validate_ThrowsException_WhenPriceIsLessThanOrEqualToZero()
    {
        Assert.Multiple(() =>
        {
            Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), "Laptop", 0, false).Validate(),
                Throws.TypeOf<ValidationException>());

            Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), "Laptop", -100, false).Validate(),
                Throws.TypeOf<ValidationException>());
        });
    }

    [Test]
    public void AllFieldsAreCorrectTest()
    {
        var id = Guid.NewGuid().ToString();
        var productName = "Laptop";
        var price = 1500.5;
        var isDeleted = false;

        var product = CreateDataModel(id, productName, price, isDeleted);

        Assert.That(() => product.Validate(), Throws.Nothing);
        Assert.Multiple(() =>
        {
            Assert.That(product.Id, Is.EqualTo(id));
            Assert.That(product.ProductName, Is.EqualTo(productName));
            Assert.That(product.Price, Is.EqualTo(price));
            Assert.That(product.IsDeleted, Is.EqualTo(isDeleted));
        });
    }

    private static ProductDataModel CreateDataModel(string? id, string? productName, double price, bool isDeleted) =>
        new(id!, productName!, price, isDeleted);
}