public void Clear_WhenCalled_ShouldClearStack(int range)
{
// Arrange
for (var i = 1; i <= range; i++)
{
_stack.Push(i);
}
// Act
_stack.Clear();
// Assert
Assert.That(_stack.IsEmpty, Is.EqualTo(true));
Assert.That(_stack.Size, Is.EqualTo(0));
}