my-biz/backend/tests/MyBiz.Tests/ProductTests.cs

using MyBiz.Core;

namespace MyBiz.Tests;

public class ProductTypeTests
{
    [Fact]
    public void ProductType_Creation_ShouldInitializeProperties()
    {
        // Arrange & Act
        var productType = new ProductType
        {
            Id = "food_bread",
            Name = "Bread",
            Description = "Fresh baked bread",
            Category = ProductCategory.ConsumerGoods,
            BasePrice = 10m,
            BaseDemand = 100,
            AvailableFromYear = 1950
        };

        // Assert
        Assert.Equal("food_bread", productType.Id);
        Assert.Equal("Bread", productType.Name);
        Assert.Equal(ProductCategory.ConsumerGoods, productType.Category);
        Assert.Equal(10m, productType.BasePrice);
        Assert.Equal(1950, productType.AvailableFromYear);
        Assert.False(productType.IsPerishable);
    }
    
    [Fact]
    public void ProductType_Clone_ShouldCreateIndependentCopy()
    {
        // Arrange
        var original = new ProductType
        {
            Id = "test",
            Name = "Test Product",
            BasePrice = 50m
        };
        original.RequiredTechnologies.Add("tech1");

        // Act
        var clone = original.Clone();
        clone.Name = "Modified";
        clone.RequiredTechnologies.Add("tech2");

        // Assert
        Assert.Equal("Test Product", original.Name);
        Assert.Equal("Modified", clone.Name);
        Assert.Single(original.RequiredTechnologies);
        Assert.Equal(2, clone.RequiredTechnologies.Count);
    }
}

public class ProductTests
{
    [Fact]
    public void Product_Add_ShouldIncreaseQuantity()
    {
        // Arrange
        var product = new Product
        {
            Type = new ProductType { Id = "test", BasePrice = 10m },
            Quantity = 5
        };

        // Act
        product.Add(10);

        // Assert
        Assert.Equal(15, product.Quantity);
    }
    
    [Fact]
    public void Product_Remove_ShouldDecreaseQuantity()
    {
        // Arrange
        var product = new Product
        {
            Type = new ProductType { Id = "test", BasePrice = 10m },
            Quantity = 20
        };

        // Act
        var removed = product.Remove(15);

        // Assert
        Assert.Equal(15, removed);
        Assert.Equal(5, product.Quantity);
    }
    
    [Fact]
    public void Product_Remove_MoreThanAvailable_ShouldRemoveAll()
    {
        // Arrange
        var product = new Product
        {
            Type = new ProductType { Id = "test", BasePrice = 10m },
            Quantity = 10
        };

        // Act
        var removed = product.Remove(50);

        // Assert
        Assert.Equal(10, removed);
        Assert.Equal(0, product.Quantity);
        Assert.True(product.IsSpoiled);
    }
    
    [Fact]
    public void Product_Perishable_ShouldSpoilAfterShelfLife()
    {
        // Arrange
        var product = new Product
        {
            Type = new ProductType { Id = "food", BasePrice = 10m, ShelfLife = 5 },
            Quantity = 10,
            CreatedAtTick = 0
        };

        // Act
        product.Update(6); // 6 ticks later

        // Assert
        Assert.True(product.IsSpoiled);
        Assert.False(product.IsUsable);
    }
}

public class ProductRegistryTests
{
    [Fact]
    public void Registry_Register_ShouldAddProductType()
    {
        // Arrange
        var registry = new ProductRegistry();
        var productType = new ProductType { Id = "test", Name = "Test" };

        // Act
        registry.Register(productType);

        // Assert
        Assert.Equal(1, registry.Count);
        Assert.Same(productType, registry.GetById("test"));
    }
    
    [Fact]
    public void Registry_GetById_UnknownId_ShouldReturnNull()
    {
        // Arrange
        var registry = new ProductRegistry();

        // Act
        var result = registry.GetById("unknown");

        // Assert
        Assert.Null(result);
    }
    
    [Fact]
    public void Registry_GetByCategory_ShouldFilterProducts()
    {
        // Arrange
        var registry = new ProductRegistry();
        registry.Register(new ProductType { Id = "raw1", Category = ProductCategory.RawMaterial });
        registry.Register(new ProductType { Id = "raw2", Category = ProductCategory.RawMaterial });
        registry.Register(new ProductType { Id = "consumer1", Category = ProductCategory.ConsumerGoods });

        // Act
        var rawMaterials = registry.GetByCategory(ProductCategory.RawMaterial);

        // Assert
        Assert.Equal(2, rawMaterials.Count());
    }
    
    [Fact]
    public void Registry_GetAvailableInYear_ShouldFilterByYear()
    {
        // Arrange
        var registry = new ProductRegistry();
        registry.Register(new ProductType { Id = "old", AvailableFromYear = 1950 });
        registry.Register(new ProductType { Id = "new", AvailableFromYear = 2000 });

        // Act
        var availableIn1970 = registry.GetAvailableInYear(1970);

        // Assert
        Assert.Single(availableIn1970);
        Assert.Equal("old", availableIn1970.First().Id);
    }
}