import "std/stack.zc"

test "Stack Push/Pop" {
  print "Testing Stack Push/Pop";
  var stack = Stack<i32>::new();
  defer stack.free();

  print "Popping on an empty stack without pushing anything prior"
  var v = stack.pop();
  assert(v.is_none(), "v should not have a valid value");

  print "Pushing in three values..."
  stack.push(123);
  stack.push(456);
  stack.push(789);
  
  v = stack.pop();
  assert(v.is_some() && v.unwrap() == 789, "v's value should be 789");

  v = stack.pop();
  assert(v.is_some() && v.unwrap() == 456, "v's value should be 456");

  v = stack.pop();
  assert(v.is_some() && v.unwrap() == 123, "v's value should be 123");

  print "Popping on an empty stack after pushing and popping three values"
  v = stack.pop();
  assert(v.is_none(), "v should not have a valid value");
}

test "Stack Clone" {
  print "Testing Stack Cloning";
  var stack = Stack<i32>::new();
  defer stack.free();
  stack.push(123);
  var stack2 = stack.clone();
  defer stack2.free();

  var v = stack2.pop();
  assert(v.is_some() && v.unwrap() == 123, "v's value should be 123");
  v = stack2.pop();
  assert(v.is_none(), "v should not have a valid value");

  v = stack.pop();
  assert(v.is_some() && v.unwrap() == 123, "v's value should be 123");
  v = stack.pop();
  assert(v.is_none(), "v should not have a valid value");
}