public void CanNotPeekWhenNoItemsInStack()
{
// Arrange
var sut = new QueueFromStacks <int>();
var expected = false;
// Act
var actual = sut.CanPeek();
// Assert
Assert.AreEqual(expected, actual);
}
public void OrderOfElementsMaintained()
{
// Arrange
var sut = new QueueFromStacks <int>();
// Act
sut.Add(1);
sut.Add(2);
sut.Add(3);
// Assert
for (var expected = 1; expected <= 3; expected++)
{
var actual = sut.Remove();
Assert.AreEqual(expected, actual);
}
}
public void RemoveReturnsFirstEntered()
{
// Arrange
var sut = new QueueFromStacks <int>();
var expected = 1;
sut.Add(expected);
sut.Add(2);
sut.Add(3);
var expectedCount = sut.Count - 1;
// Act
var actual = sut.Remove();
// Assert
Assert.AreEqual(expected, actual);
Assert.AreEqual(expectedCount, sut.Count);
}
public void PeekReturnsFirstEnteredWithoutPopping()
{
// Arrange
var sut = new QueueFromStacks <int>();
var expected = 1;
sut.Add(expected);
sut.Add(2);
sut.Add(3);
var expectedCount = sut.Count;
// Act
var actual = sut.Peek();
// Assert
Assert.AreEqual(expected, actual);
Assert.AreEqual(expectedCount, sut.Count);
}
