public void Linq9_Customers_ReturnsGroupedProducts()
{
var expected = new List <(string city, int averageIncome, int averageIntensity)>
{
("Berlin", 674, 3),
("Mexico D.F.", 292, 2),
("London", 690, 1),
};
var result = SelectExtensions.Linq9(DataSource.Customers).ToList();
foreach (var valueTuple in result)
{
var expectedValue = expected.Single(_ => _.city == valueTuple.city);
Assert.That(expectedValue.averageIncome, Is.EqualTo(valueTuple.averageIncome));
Assert.That(expectedValue.averageIntensity, Is.EqualTo(valueTuple.averageIntensity));
}
}
public void Linq9_NullCustomers_ThrowsArgumentNullException()
{
Assert.That(() => SelectExtensions.Linq9(null).ToList(), Throws.ArgumentNullException);
}
