public void Linq8_Products_ReturnsGroupedProducts()
{
decimal cheap = 10, middle = 30, expensive = 40;
var result = SelectExtensions.Linq8(DataSource.Products, cheap, middle, expensive).ToList();
var cheapProducts = result.Single(_ => _.category == cheap).products;
Assert.That(cheapProducts.Count(), Is.EqualTo(1));
var middleProducts = result.Single(_ => _.category == middle).products;
Assert.That(middleProducts.Count(), Is.EqualTo(3));
var expensiveProducts = result.Single(_ => _.category == expensive).products;
Assert.That(expensiveProducts.Count(), Is.EqualTo(1));
}
public void Linq8_NullProducts_ThrowsArgumentNullException()
{
Assert.That(() => SelectExtensions.Linq8(null, 42, 42, 42).ToList(), Throws.ArgumentNullException);
}