public void ExecuteIfCommandWithFalseCondition()
{
IfCommand ifcmd = new IfCommand(new ConstantExpression(false), new SetCommand("one", new ConstantExpression(1)));
Machine machine = new Machine();
ifcmd.Execute(machine.Environment);
Assert.IsNull(machine.Environment.GetValue("one"));
}
public void ExecuteIfCommandWithTrueCondition()
{
IfCommand ifcmd = new IfCommand(new ConstantExpression(true), new SetCommand("one", new ConstantExpression(1)));
Machine machine = new Machine();
ifcmd.Execute(machine.Environment);
Assert.IsNotNull(ifcmd.ThenCommand);
Assert.IsNull(ifcmd.ElseCommand);
Assert.AreEqual(1, machine.Environment.GetValue("one"));
}
public void ExecuteSimpleForWithContinue()
{
ICommand ifcmd = new IfCommand(new CompareExpression(ComparisonOperator.Equal, new NameExpression("a"), new ConstantExpression(2)), new ContinueCommand());
ICommand setcmd = new SetCommand("b", new BinaryOperatorExpression(new NameExpression("a"), new NameExpression("b"), BinaryOperator.Add));
ICommand body = new CompositeCommand(new ICommand[] { ifcmd, setcmd });
BindingEnvironment environment = new BindingEnvironment();
environment.SetValue("b", 0);
ForCommand command = new ForCommand("a", new ConstantExpression(new object[] { 1, 2, 3 }), body);
command.Execute(environment);
Assert.AreEqual(4, environment.GetValue("b"));
}
public void CreateAndEvaluateSimpleWhileCommandWithContinue()
{
BindingEnvironment environment = new BindingEnvironment();
environment.SetValue("a", 1);
IExpression condition = new CompareExpression(ComparisonOperator.Less, new NameExpression("a"), new ConstantExpression(10));
ICommand ifcmd = new IfCommand(new CompareExpression(ComparisonOperator.Equal, new NameExpression("a"), new ConstantExpression(2)), new ContinueCommand());
ICommand setcmd = new SetCommand("a", new BinaryOperatorExpression(new NameExpression("a"), new ConstantExpression(1), BinaryOperator.Add));
ICommand body = new CompositeCommand(new ICommand[] { setcmd, ifcmd, setcmd });
WhileCommand command = new WhileCommand(condition, body);
command.Execute(environment);
Assert.AreEqual(condition, command.Condition);
Assert.AreEqual(body, command.Command);
Assert.AreEqual(10, environment.GetValue("a"));
}