/// <summary>
/// A test for Empty
/// </summary>
/// <typeparam name="T">The type of elements held in the stack.</typeparam>
private void EmptyTestHelper <T>() where T : new()
{
IImmutableStack <T> actual = ImmutableStack <T> .Empty;
Assert.NotNull(actual);
Assert.True(actual.IsEmpty);
AssertAreSame(ImmutableStack <T> .Empty, actual.Clear());
AssertAreSame(ImmutableStack <T> .Empty, actual.Push(new T()).Clear());
}
public void TestClear()
{
ImmutableTreeStack <int> stack = ImmutableTreeStack <int> .Empty;
Assert.Same(stack, stack.Clear());
foreach (int item in Enumerable.Range(0, 10))
{
stack = stack.Push(item);
}
Assert.NotEmpty(stack);
Assert.Same(ImmutableTreeStack <int> .Empty, stack.Clear());
// Test through the IImmutableStack<T> interface
IImmutableStack <int> immutableStack = stack;
Assert.NotEmpty(immutableStack);
Assert.Same(ImmutableTreeStack <int> .Empty, immutableStack.Clear());
}
public static IImmutableStack <T> clear <T>(IImmutableStack <T> stack) => stack.Clear();
