public void should_throw_when_pop_from_empty()
{
IStack <int> stack = new Services.Stack <int>();
Action act = () => stack.Pop();
act.Should().Throw <InvalidOperationException>();
}
public void should_return_false_when_trypop_from_empty()
{
IStack <int> stack = new Services.Stack <int>();
int result;
stack.TryPop(out result).Should().BeFalse();
}
public void should_return_true_when_trypop_after_push()
{
IStack <int> stack = new Services.Stack <int>();
stack.Push(123);
int popped;
bool result = stack.TryPop(out popped);
result.Should().BeTrue();
popped.Should().Be(123);
}
public void should_allow_many_items(int itemCount)
{
IStack <double> stack = new Services.Stack <double>();
Action act = () =>
{
for (int i = 0; i < itemCount; i++)
{
stack.Push(1.0 / i);
}
};
act.Should().NotThrow();
}
public void should_still_contain_items_after_trypop()
{
IStack <int> stack = new Services.Stack <int>();
stack.Push(321);
int popped;
stack.TryPop(out popped);
Action act = () => stack.Pop();
act.Should().NotThrow();
}
public static IEnumerable <TestCaseData> GetNonEmptyTestObjects()
{
var stack = new Services.Stack <string>();
stack.Push("Bravo");
stack.Push("Alpha");
yield return(new TestCaseData(stack, "Alpha").SetName("{m}_stack"));
var queue = new Services.Queue <string>();
queue.Enqueue("Bravo");
queue.Enqueue("Alpha");
yield return(new TestCaseData(queue, "Bravo").SetName("{m}_queue"));
}
public void should_be_empty_after_popping_all_items()
{
IStack <string> stack = new Services.Stack <string>();
var items = new[] { "Alpha", "Bravo", "Charlie", "Delta" };
foreach (string s in items)
{
stack.Push(s);
}
for (int i = 0; i < items.Length; i++)
{
stack.Pop();
}
stack.Invoking(s => s.Pop()).Should().Throw <InvalidOperationException>();
}
public void should_pop_items_correctly(int itemCount)
{
IStack <int> stack = new Services.Stack <int>();
int[] range = Enumerable.Range(1, itemCount).ToArray();
int[] expected = range.Reverse().ToArray();
foreach (int i in range)
{
stack.Push(i);
}
var actual = new int[range.Length];
int index = 0;
foreach (int _ in range)
{
actual[index++] = stack.Pop();
}
actual.Should().BeEquivalentTo(expected);
}
