public void StackTracksCountForSegmentsCorrectly()
{
var stack = new SegmentedStack <string>();
stack.Push("1");
stack.Push("2");
stack.Push("3");
Assert.Equal(3, stack.Count);
using (stack.EnterSegment())
{
Assert.Equal(0, stack.Count);
stack.Push("4");
stack.Push("5");
stack.Push("6");
Assert.Equal(3, stack.Count);
stack.Pop();
stack.Pop();
stack.Pop();
Assert.Equal(0, stack.Count);
}
Assert.Equal(3, stack.Count);
}
public void CanCreateStackSegment()
{
var stack = new SegmentedStack <string>();
stack.Push("1");
stack.Push("2");
stack.Push("3");
using (stack.EnterSegment())
{
Assert.Equal(stack, Enumerable.Empty <string>());
stack.Push("4");
stack.Push("5");
stack.Push("6");
Assert.Equal(stack, new[] { "6", "5", "4" });
stack.Pop();
stack.Pop();
stack.Pop();
Assert.Equal(stack, Enumerable.Empty <string>());
}
Assert.Equal(stack, new[] { "3", "2", "1" });
}
public void CannotPopEmptySegment()
{
var stack = new SegmentedStack <string>();
stack.Push("1");
stack.Push("2");
stack.Push("3");
using (stack.EnterSegment())
{
Assert.Throws <InvalidOperationException>(() => stack.Pop());
}
}
public void CannotExitSegmentWithUnpoppedItems()
{
var stack = new SegmentedStack <string>();
stack.Push("1");
stack.Push("2");
stack.Push("3");
Assert.Equal(3, stack.Count);
var segment = stack.EnterSegment();
Assert.Equal(0, stack.Count);
stack.Push("4");
stack.Push("5");
stack.Push("6");
Assert.Equal(3, stack.Count);
stack.Pop();
Assert.Throws <InvalidOperationException>(() => segment.Dispose());
}