public void ProductsByCategory_Should_Throw_ArgumentNullException_If_ProductCategories_Is_Null()
{
IQueryable <ProductCategory> productCategories = null;
Guid categoryId = Guid.NewGuid();
var ex = Assert.Throws <ArgumentNullException>(() => ProductCategoryExtensions.ProductsByCategory(productCategories, categoryId));
Assert.Equal(nameof(productCategories), ex.ParamName);
}
public void ProductsByCategory_Should_Throw_ArgumentException_If_CategoryId_Is_Empty()
{
IQueryable <ProductCategory> productCategories = new ProductCategory[]
{
new ProductCategory {
ProductId = Guid.NewGuid(), CategoryId = Guid.NewGuid()
},
new ProductCategory {
ProductId = Guid.NewGuid(), CategoryId = Guid.NewGuid()
},
new ProductCategory {
ProductId = Guid.NewGuid(), CategoryId = Guid.NewGuid()
}
}.AsQueryable();
Guid categoryId = Guid.Empty;
var ex = Assert.Throws <ArgumentException>(() => ProductCategoryExtensions.ProductsByCategory(productCategories, categoryId));
Assert.Equal(nameof(categoryId), ex.ParamName);
}
public void ProductsByCategory_Should_Return_Only_ProductCategories_With_The_Specified_Category()
{
Guid categoryId = Guid.NewGuid();
IQueryable <ProductCategory> productCategories = new ProductCategory[]
{
new ProductCategory {
ProductId = Guid.NewGuid(), CategoryId = categoryId
},
new ProductCategory {
ProductId = Guid.NewGuid(), CategoryId = categoryId
},
new ProductCategory {
ProductId = Guid.NewGuid(), CategoryId = Guid.NewGuid()
}
}.AsQueryable();
var productCategoriesByCategory = ProductCategoryExtensions.ProductsByCategory(productCategories, categoryId).ToArray();
Assert.True(productCategoriesByCategory.Length == 2);
}