public void IfStackEmptyThenOperationShouldApplyToAccumulatorTest()
{
var cpu = new SimpleCpu();
cpu.Accumulator.SetValue(10);
var operation = cpu.FindOperation("negate");
operation.Execute();
Assert.IsTrue(cpu.OperandStack.Count == 0);
Assert.IsTrue(cpu.Accumulator.ToString() == "-10");
}
public void IfAccumulatorEmptyThenOperationShouldApplyToOperandStackTest()
{
var cpu = new SimpleCpu();
cpu.OperandStack.Push(10);
var operation = cpu.FindOperation("negate");
operation.Execute();
Assert.IsTrue(cpu.OperandStack.Count == 1);
Assert.IsTrue(cpu.OperandStack.Peek() == -10);
}
public void TwoOperandWithoutExistingOperatorShouldEvaulateTest()
{
var cpu = new SimpleCpu();
cpu.OperandStack.Push(5);
cpu.OperandStack.Push(6);
var op = cpu.FindOperation("+");
op.Execute();
Assert.IsTrue(cpu.OperandStack.Count == 1);
Assert.IsTrue(cpu.OperandStack.Peek() == 11);
Assert.IsTrue(cpu.OperatorStack.Count == 0);
}
public void SingleOperandShouldQueueOperationTest()
{
var cpu = new SimpleCpu();
cpu.OperandStack.Push(5);
var op = cpu.FindOperation("+");
op.Execute();
Assert.IsTrue(cpu.OperandStack.Count == 1);
Assert.IsTrue(cpu.OperandStack.Peek() == 5);
Assert.IsTrue(cpu.OperatorStack.Count == 1);
Assert.IsTrue(cpu.OperatorStack.Peek() == "+");
}
