public void Peek_Branch_Test_1()
{
ArrayBasedQueue <int> queue = new ArrayBasedQueue <int>(1);
Assert.That(() => queue.Peek(),
Throws.TypeOf <InvalidOperationException>()
.With.Message.EqualTo("There are no items in the queue."));
}
public void Enqueue_Branch_Test_2()
{
ArrayBasedQueue <int> queue = new ArrayBasedQueue <int>(2);
queue.Enqueue(1);
Assert.Multiple(() =>
{
Assert.AreEqual(queue.Peek(), 1);
Assert.IsFalse(queue.IsFull());
Assert.IsFalse(queue.IsEmpty());
});
}
public static void PeekEmptyQueueThrowsInvalidOperationException()
{
// Arrange
var q = new ArrayBasedQueue <int>(1);
Exception?exception = null;
// Act
try
{
q.Peek();
}
catch (Exception ex)
{
exception = ex;
}
// Assert
Assert.AreEqual(expected: typeof(InvalidOperationException), actual: exception?.GetType());
}
public static void PeekWorksCorrectly()
{
// Arrange
var q = new ArrayBasedQueue <int>(2);
q.Enqueue(1);
q.Enqueue(2);
int peeked = 0;
// Act
for (int i = 0; i < 3; i++)
{
peeked = q.Peek();
}
// Assert
Assert.AreEqual(expected: 1, actual: peeked);
Assert.IsFalse(q.IsEmpty(), "Queue is empty");
Assert.IsTrue(q.IsFull(), "Queue is full");
}