package chunk

import "testing"

func TestOOB(t *testing.T) {
	stack := NewStack(1)

	item := stack.Push(1)
	stack.Touch(item)
}

func TestAddToStack(t *testing.T) {
	stack := NewStack(1)

	item1 := stack.Push(1)
	item2 := stack.Push(2)
	item3 := stack.Push(3)
	item4 := stack.Push(4)

	stack.Touch(item1)
	stack.Touch(item3)

	stack.Purge(item2)
	stack.Purge(item4)

	v := stack.Pop()
	if v != 4 {
		t.Fatalf("Expected 4 got %v", v)
	}

	v = stack.Pop()
	if v != 2 {
		t.Fatalf("Expected 2 got %v", v)
	}

	v = stack.Pop()
	if v != 1 {
		t.Fatalf("Expected 1 got %v", v)
	}

	v = stack.Pop()
	if v != 3 {
		t.Fatalf("Expected 3 got %v", v)
	}

	v = stack.Pop()
	if v != -1 {
		t.Fatalf("Expected -1 got %v", v)
	}
}

func TestLen(t *testing.T) {
	stack := NewStack(1)

	v := stack.Len()
	if v != 0 {
		t.Fatalf("Expected 0 got %v", v)
	}

	stack.Push(1)
	v = stack.Len()
	if v != 1 {
		t.Fatalf("Expected 1 got %v", v)
	}

	_ = stack.Pop()
	v = stack.Len()
	if v != 0 {
		t.Fatalf("Expected 0 got %v", v)
	}

}