public void Linq5_Customers_CustomersAndDateOfEntry()
{
var result = SelectExtensions.Linq5(DataSource.Customers).ToList();
Assert.That(() => result.Count, Is.EqualTo(DataSource.Customers.Count - 1));
foreach (var(customer, dateOfEntry) in result)
{
Assert.That(FindCustomerOrdersMinDate(customer), Is.EqualTo(dateOfEntry));
}
Assert.That(result[0].customer, Is.EqualTo(DataSource.Customers[1]));
Assert.That(result[1].customer, Is.EqualTo(DataSource.Customers[3]));
Assert.That(result[2].customer, Is.EqualTo(DataSource.Customers[2]));
Assert.That(result[3].customer, Is.EqualTo(DataSource.Customers[4]));
Assert.That(result[4].customer, Is.EqualTo(DataSource.Customers[0]));
}
public void Linq5_NullCustomer_ThrowsArgumentNullException()
{
Assert.That(() => SelectExtensions.Linq5(null).ToList(), Throws.ArgumentNullException);
}