public void VisitCall_CallsMethodWithCorrectOrderOfParametersPulledFromStack()
{
var testVmContext = new TestVmContext();
testVmContext.ValueStack.Push(1);
testVmContext.ValueStack.Push(2);
testVmContext.ValueStack.Push(3);
var sut = new RuntimeVisitor(testVmContext);
sut.VisitCall(new CallInstruction(RuntimeVisitorTests.CorrectOrderVMFunction));
}
public void VisitSubtraction_DoesSubtractionWithNegativeResult_ResultPushedToValueStack()
{
var testVmContext = new TestVmContext();
testVmContext.ValueStack.Push(7);
testVmContext.ValueStack.Push(10);
var sut = new RuntimeVisitor(testVmContext);
sut.VisitSubtraction(new SubtractionInstruction());
Assert.Equal(-3, testVmContext.ValueStack.Peek());
}
public void VisitListNewInstruction_CreatesNewListOnTopOfValueStack()
{
var testVmContext = new TestVmContext();
var sut = new RuntimeVisitor(testVmContext);
sut.VisitList(new ListNewInstruction());
Assert.Single(testVmContext.ValueStack);
var topValue = testVmContext.ValueStack.Pop();
Assert.IsType <List <object> >(topValue);
var theList = (List <object>)topValue;
Assert.Empty(theList);
}
public void VisitListAddInstruction_AddsObjectToListInValueStack()
{
var testVmContext = new TestVmContext();
testVmContext.ValueStack.Push(new List <object>());
testVmContext.ValueStack.Push(42);
var sut = new RuntimeVisitor(testVmContext);
sut.VisitList(new ListAddInstruction());
Assert.Single(testVmContext.ValueStack);
var topValue = testVmContext.ValueStack.Pop();
Assert.IsType <List <object> >(topValue);
var theList = (List <object>)topValue;
Assert.Single(theList);
Assert.Equal(42, theList[0]);
}
