public void ForceFIFO()
{
int maxSize = 3;
CommandHistory history = new CommandHistory(maxSize);
// Add 3 commands
TestCommand1 cmd1 = new TestCommand1();
TestCommand2 cmd2 = new TestCommand2();
TestCommand3 cmd3 = new TestCommand3();
history.AddCommand(cmd1);
history.AddCommand(cmd2);
history.AddCommand(cmd3);
Assert.AreEqual(3, history.NumCommands);
// Force history to drop oldest item (FIFO)
TestCommand4 cmd4 = new TestCommand4();
history.AddCommand(cmd4);
Assert.AreEqual(3, history.NumCommands);
// Undo all commands
history.Undo();
Assert.AreEqual("Unexecuted TestCommand4", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand3", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand2", _message);
// We've undone all the commands; test the boundary
// by adding a new one
TestCommand5 cmd5 = new TestCommand5();
history.AddCommand(cmd5);
Assert.AreEqual(1, history.NumCommands);
}
public void AddUndoRedo()
{
int maxSize = 10;
CommandHistory history = new CommandHistory(maxSize);
// Add 4 commands
TestCommand1 cmd1 = new TestCommand1();
TestCommand2 cmd2 = new TestCommand2();
TestCommand3 cmd3 = new TestCommand3();
TestCommand4 cmd4 = new TestCommand4();
history.AddCommand(cmd1);
history.AddCommand(cmd2);
history.AddCommand(cmd3);
history.AddCommand(cmd4);
Assert.AreEqual(4, history.NumCommands);
// Undo all commands we've added
history.Undo();
Assert.AreEqual("Unexecuted TestCommand4", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand3", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand2", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand1", _message);
// Try to undo two extra times, even though we should be at the beginning
_message = String.Empty;
history.Undo();
Assert.AreEqual(String.Empty, _message);
history.Undo();
Assert.AreEqual(String.Empty, _message);
// Redo all commands we've added
history.Redo();
Assert.AreEqual("Executed TestCommand1", _message);
history.Redo();
Assert.AreEqual("Executed TestCommand2", _message);
history.Redo();
Assert.AreEqual("Executed TestCommand3", _message);
history.Redo();
Assert.AreEqual("Executed TestCommand4", _message);
// Try to redo two extra times, even though we should be at the end
_message = String.Empty;
history.Redo();
Assert.AreEqual(String.Empty, _message);
history.Redo();
Assert.AreEqual(String.Empty, _message);
// Add another command
TestCommand5 cmd5 = new TestCommand5();
history.AddCommand(cmd5);
Assert.AreEqual(5, history.NumCommands);
// Undo a couple times
history.Undo();
Assert.AreEqual("Unexecuted TestCommand5", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand4", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand3", _message);
// Now add a new command
TestCommand6 cmd6 = new TestCommand6();
history.AddCommand(cmd6);
Assert.AreEqual(3, history.NumCommands);
// Try to redo again
_message = String.Empty;
history.Redo();
Assert.AreEqual(String.Empty, _message);
// Undo again
history.Undo();
Assert.AreEqual("Unexecuted TestCommand6", _message);
history.Undo();
Assert.AreEqual("Unexecuted TestCommand2", _message);
}