public void RetrieveAllTest()
{
// Arrange
var repository = new VendorRepository();
var expected = new List<Vendor>()
{
new Vendor()
{
VendorId = 10, CompanyName = "Amazon", Email = "*****@*****.**"
},
new Vendor()
{
VendorId = 69, CompanyName = "ESPN", Email = "*****@*****.**"
},
new Vendor()
{
VendorId = 82, CompanyName = "Uber", Email = "*****@*****.**"
}
};
// Actual
var vendors = repository.RetrieveAll();
//var vendorQuery = from v in vendors
// where v.Email.Contains(".net")
// orderby v.CompanyName
// select v;
// LINQ methods such as Where takes in a delegate as the argument. The delegate
// must be in the form of Func<Vendor, bool>, where Vendor is the parameter and
// bool is the return type. To test this, we wrote a private method called
// FilterCompanies and inserted into LINQ's Where method.
//var vendorQuery = vendors.Where(FilterCompanies)
// .OrderBy(OrderCompaniesByName);
// Using lambda expressions within LINQ methods, instead of delegates, reduces clutter.
var vendorQuery = vendors.Where(v => v.Email.Contains(".net"))
.OrderBy(v => v.CompanyName);
// Assert
CollectionAssert.AreEqual(expected, vendorQuery.ToList());
}
