public void CanEnumerateFixedQueue()
{
var pq1 = new TestPriorityQueue <char>(5); // fixed capacity
pq1.AddWithOverflow('f');
pq1.AddWithOverflow('u');
pq1.AddWithOverflow('b');
pq1.AddWithOverflow('a');
pq1.AddWithOverflow('r');
var enumerator = pq1.GetEnumerator();
var list1 = Iterate(enumerator);
Assert.AreEqual("abfru", new string(list1.OrderBy(c => c).ToArray()));
pq1.Clear();
pq1.Add('f');
pq1.Add('o');
pq1.Add('o');
enumerator.Reset();
var list2 = Iterate(enumerator);
Assert.AreEqual("foo", new string(list2.OrderBy(c => c).ToArray()));
enumerator.Dispose();
}
public void CannotEnumerateChangingQueue()
{
const string items = "hello";
var pq = new TestPriorityQueue <char>(items.Length + 1);
foreach (var c in items)
{
pq.Add(c);
}
var iter = pq.GetEnumerator();
Assert.True(iter.MoveNext());
pq.Add('x'); // modify (will fill up capacity)
var ex1 = Assert.Catch <InvalidOperationException>(() => iter.MoveNext());
Console.WriteLine("Expected after Add: {0}", ex1.Message);
iter.Reset();
Assert.True(iter.MoveNext());
pq.AddWithOverflow('y'); // modify (will overflow)
var ex2 = Assert.Catch <InvalidOperationException>(() => iter.MoveNext());
Console.WriteLine("Expected after AddWithOverflow: {0}", ex2.Message);
iter.Reset();
Assert.True(iter.MoveNext());
pq.Pop(); // modify
var ex3 = Assert.Catch <InvalidOperationException>(() => iter.MoveNext());
Console.WriteLine("Expected after Pop: {0}", ex3.Message);
iter.Reset();
Assert.True(iter.MoveNext());
pq.Clear(); // modify
var ex4 = Assert.Catch <InvalidOperationException>(() => iter.MoveNext());
Console.WriteLine("Expected after Clear: {0}", ex4.Message);
iter.Dispose();
}
public void CannotEnumerateChangingQueue()
{
const string items = "hello";
var pq = new TestPriorityQueue <char>(items.Length + 1);
foreach (var c in items)
{
pq.Add(c);
}
var iter = pq.GetEnumerator();
Assert.True(iter.MoveNext());
pq.Add('x'); // modify (will fill up capacity)
Assert.Throws <InvalidOperationException>(() => iter.MoveNext());
iter.Reset();
Assert.True(iter.MoveNext());
pq.AddWithOverflow('y'); // modify (will overflow)
Assert.Throws <InvalidOperationException>(() => iter.MoveNext());
iter.Reset();
Assert.True(iter.MoveNext());
pq.Pop(); // modify
Assert.Throws <InvalidOperationException>(() => iter.MoveNext());
iter.Reset();
Assert.True(iter.MoveNext());
pq.Clear(); // modify
Assert.Throws <InvalidOperationException>(() => iter.MoveNext());
iter.Dispose();
}