public void FilteringByNameReturnsSubsetOfResults()
{
List<Customer> customers = TestHelpers.GetSampleCustomersList();
MainViewModel viewModel = new MainViewModel();
// CustomersBuckup is private field to keep data unchanged
// and should not be exposed.
// Use reflection for the purpose of the test.
System.Reflection.FieldInfo fieldInfo = typeof(MainViewModel).GetField("customersBuckup",
System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
Assert.IsNotNull(fieldInfo);
fieldInfo.SetValue(viewModel, customers);
viewModel.Customers = customers;
viewModel.Filter = "a";
List<Customer> customersWithAInName = customers.Where(c => c.Name.Contains("a")).ToList();
CollectionAssert.AreEquivalent(customersWithAInName, viewModel.Customers.ToList());
CollectionAssert.IsSubsetOf(viewModel.Customers.ToList(), customers);
// sanity check if the result is not always true
CollectionAssert.IsNotSubsetOf(customers, viewModel.Customers.ToList());
// empty fielter should bring back all the customers
viewModel.Filter = string.Empty;
CollectionAssert.AreEquivalent(viewModel.Customers.ToList(), customers);
}
public void IfUserListEmptyShowStatsCommandDoesNotExecute()
{
Customer customer = new Customer();
MainViewModel viewModel = new MainViewModel();
Assert.IsFalse(viewModel.ShowStatsCommand.CanExecute(null));
viewModel.Customers = new List<Customer> { customer };
Assert.IsTrue(viewModel.ShowStatsCommand.CanExecute(null));
}
public void IfNoUserIsSelectedUpdateCommandDoesNotExecute()
{
Customer customer = new Customer();
MainViewModel viewModel = new MainViewModel();
Assert.IsFalse(viewModel.UpdateCustomerCommand.CanExecute(null));
viewModel.SelectedCustomer = customer;
Assert.IsTrue(viewModel.UpdateCustomerCommand.CanExecute(null));
}
/// <summary>
/// Creates an instance of the DisplayModificationHistoryCommand.
/// </summary>
/// <param name="mainViewModel">A view model on which command's method will be invoked.</param>
public DisplayModificationHistoryCommand(MainViewModel mainViewModel)
{
this.mainViewModel = mainViewModel;
}
/// <summary>
/// Creates an instance of the UpdateCustomerCommand.
/// </summary>
/// <param name="mainViewModel">A view model on which command's method will be invoked.</param>
public UpdateCustomerCommand(MainViewModel mainViewModel)
{
this.mainViewModel = mainViewModel;
}
public void SettingCustomerToMainViewModelTriggersPropertyChanged()
{
Customer customer = new Customer();
MainViewModel viewModel = new MainViewModel();
viewModel.PropertyChanged += (s, e) =>
{
Assert.AreEqual("SelectedCustomer", e.PropertyName);
Assert.AreEqual(customer, viewModel.SelectedCustomer);
};
viewModel.SelectedCustomer = customer;
}
public void SettingCustomersToMainViewModelTriggersPropertyChanged()
{
List<Customer> customers = new List<Customer>()
{
new Customer() {Name="A"},
new Customer() {Name="B"},
new Customer() {Name="C"}
};
MainViewModel viewModel = new MainViewModel();
viewModel.PropertyChanged += (s, e) =>
{
Assert.AreEqual("Customers", e.PropertyName);
Assert.AreEqual(customers, viewModel.Customers);
};
viewModel.Customers = customers;
}
/// <summary>
/// Creates an instance of the ShowStatsCommand.
/// </summary>
/// <param name="mainViewModel">A view model on which command's method will be invoked.</param>
public ShowStatsCommand(MainViewModel mainViewModel)
{
this.mainViewModel = mainViewModel;
}
/// <summary>
/// Creates an instance of the GetDataCommand.
/// </summary>
/// <param name="viewModel">A view model on which command's method will be invoked.</param>
internal GetDataCommand(MainViewModel viewModel)
{
this.customerViewModel = viewModel;
}
/// <summary>
/// Creates an instance of the AddCustomerCommand.
/// </summary>
/// <param name="mainViewModel">A view model on which command's method will be invoked.</param>
public AddCustomerCommand(MainViewModel mainViewModel)
{
this.mainViewModel = mainViewModel;
}
