public void TestUpdateCustomerWithUpdateCheckThatDoesNotSucceed()
{
this.TestInsertCustomerNoResult();
var cust = new
{
//CustomerID = "XX1",
CompanyName = "Company1",
ContactName = "Contact1",
City = "Portland",
Country = "USA"
};
var result = db.Customers.Update(cust, d => d.City == "111");
AssertValue(0, result); // 0 for failure
}