public void RegisterACommandShouldRaiseCanExecuteEvent()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommand = new TestCommand();
multiCommand.RegisterCommand(new TestCommand());
Assert.IsTrue(multiCommand.CanExecuteChangedRaised);
}
public void ShouldDelegateCanExecuteToSingleRegistrant()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommand = new TestCommand();
multiCommand.RegisterCommand(testCommand);
Assert.IsFalse(testCommand.CanExecuteCalled);
multiCommand.CanExecute(null);
Assert.IsTrue(testCommand.CanExecuteCalled);
}
public void ShouldDelegateCanExecuteToMultipleRegistrants()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommandOne = new TestCommand();
TestCommand testCommandTwo = new TestCommand();
multiCommand.RegisterCommand(testCommandOne);
multiCommand.RegisterCommand(testCommandTwo);
Assert.IsFalse(testCommandOne.CanExecuteCalled);
Assert.IsFalse(testCommandTwo.CanExecuteCalled);
multiCommand.CanExecute(null);
Assert.IsTrue(testCommandOne.CanExecuteCalled);
Assert.IsTrue(testCommandTwo.CanExecuteCalled);
}
public void CanExecuteShouldReturnTrueIfAllRegistrantsTrue()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommandOne = new TestCommand() { CanExecuteValue = true };
TestCommand testCommandTwo = new TestCommand() { CanExecuteValue = true };
multiCommand.RegisterCommand(testCommandOne);
multiCommand.RegisterCommand(testCommandTwo);
Assert.IsTrue(multiCommand.CanExecute(null));
}
public void RegisteringCommandTwiceThrows()
{
var compositeCommand = new CompositeCommand();
var duplicateCommand = new TestCommand();
compositeCommand.RegisterCommand(duplicateCommand);
compositeCommand.RegisterCommand(duplicateCommand);
}
public void UnregisterCommandDisconnectsCanExecuteChangedDelegate()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommandOne = new TestCommand() { CanExecuteValue = true };
multiCommand.RegisterCommand(testCommandOne);
multiCommand.UnregisterCommand(testCommandOne);
multiCommand.CanExecuteChangedRaised = false;
testCommandOne.FireCanExecuteChanged();
Assert.IsFalse(multiCommand.CanExecuteChangedRaised);
}
public void UnregisterCommandShouldRaiseCanExecuteEvent()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommandOne = new TestCommand();
multiCommand.RegisterCommand(testCommandOne);
multiCommand.CanExecuteChangedRaised = false;
multiCommand.UnregisterCommand(testCommandOne);
Assert.IsTrue(multiCommand.CanExecuteChangedRaised);
}
public void UnregisterCommandRemovesFromExecuteDelegation()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommandOne = new TestCommand() { CanExecuteValue = true };
multiCommand.RegisterCommand(testCommandOne);
multiCommand.UnregisterCommand(testCommandOne);
Assert.IsFalse(testCommandOne.ExecuteCalled);
multiCommand.Execute(null);
Assert.IsFalse(testCommandOne.ExecuteCalled);
}
public void ShouldReraiseCanExecuteChangedEventAfterCollect()
{
TestableCompositeCommand multiCommand = new TestableCompositeCommand();
TestCommand testCommandOne = new TestCommand() { CanExecuteValue = true };
Assert.IsFalse(multiCommand.CanExecuteChangedRaised);
multiCommand.RegisterCommand(testCommandOne);
multiCommand.CanExecuteChangedRaised = false;
GC.Collect();
testCommandOne.FireCanExecuteChanged();
Assert.IsTrue(multiCommand.CanExecuteChangedRaised);
}
public void RegisteringCommandTwiceThrows()
{
var compositeCommand = new CompositeCommand();
var duplicateCommand = new TestCommand();
compositeCommand.RegisterCommand(duplicateCommand);
Assert.ThrowsException<InvalidOperationException>(() => compositeCommand.RegisterCommand(duplicateCommand));
}