Example2_GetProducts.cs

[Test]
public void Example2_GetProducts_WhenPassingAValidCategory_ThenShouldReturnProducts()
{
        // setup repository mock
        var products = new List<Product>
        {
                new Product { Id = 1, Name = "Product 1" },
                new Product { Id = 2, Name = "Product 2" }
        };

        IProductCatalogRepository repository = Substitute.For<IProductCatalogRepository>();
        repository.GetProducts(Arg.Is("ElectronicDevices")).Returns(products);

        // create object under test
        var testSubject = new ProductCatalogService(repository);

        // assert
        var result = testSubject.GetProducts(Category.ElectronicDevices);

        Assert.IsNotNull(result);
        Assert.IsTrue(result.ToList().Count != 0);
}