public void Keys_GetEnumerator_Invalid(int count)
{
MyNameObjectCollection nameObjectCollection = Helpers.CreateNameObjectCollection(count);
NameObjectCollectionBase.KeysCollection keys = nameObjectCollection.Keys;
IEnumerator enumerator = keys.GetEnumerator();
// Has not started enumerating
Assert.Throws <InvalidOperationException>(() => enumerator.Current);
// Has finished enumerating
while (enumerator.MoveNext())
{
;
}
Assert.Throws <InvalidOperationException>(() => enumerator.Current);
// Has reset enumerating
enumerator.Reset();
Assert.Throws <InvalidOperationException>(() => enumerator.Current);
// Modify collection
enumerator.MoveNext();
nameObjectCollection.Add("new-name", new Foo("new-value"));
Assert.Throws <InvalidOperationException>(() => enumerator.MoveNext());
Assert.Throws <InvalidOperationException>(() => enumerator.Reset());
if (count > 0)
{
Assert.NotNull(enumerator.Current);
}
// Modified read only collection still throws
nameObjectCollection.IsReadOnly = true;
Assert.Throws <InvalidOperationException>(() => enumerator.MoveNext());
Assert.Throws <InvalidOperationException>(() => enumerator.Reset());
// Clear collection
nameObjectCollection.IsReadOnly = false;
enumerator = keys.GetEnumerator();
enumerator.MoveNext();
nameObjectCollection.Clear();
Assert.Throws <InvalidOperationException>(() => enumerator.Current);
Assert.Throws <InvalidOperationException>(() => enumerator.MoveNext());
Assert.Throws <InvalidOperationException>(() => enumerator.Reset());
}
public void Keys_GetEnumerator(int count)
{
MyNameObjectCollection nameObjectCollection = Helpers.CreateNameObjectCollection(count);
NameObjectCollectionBase.KeysCollection keys = nameObjectCollection.Keys;
Assert.NotSame(keys.GetEnumerator(), keys.GetEnumerator());
IEnumerator enumerator = keys.GetEnumerator();
for (int i = 0; i < 2; i++)
{
int counter = 0;
while (enumerator.MoveNext())
{
Assert.Equal(keys[counter], enumerator.Current);
counter++;
}
Assert.Equal(count, keys.Count);
enumerator.Reset();
}
}