public void ReadOnlyCollectionBuilder_GetEnumerator(int length)
{
var rocb = new ReadOnlyCollectionBuilder <int>();
for (int i = 0; i < length; i++)
{
rocb.Add(i);
}
for (int j = 0; j < 2; j++)
{
IEnumerator <int> enumerator = rocb.GetEnumerator();
// NB: Current property on generic enumerator doesn't throw; this is consistent with List<T>.
for (int i = 0; i < length; i++)
{
Assert.True(enumerator.MoveNext());
Assert.Equal(i, enumerator.Current);
Assert.Equal(i, ((IEnumerator)enumerator).Current);
enumerator.Dispose(); // NB: Similar to List<T>, calling Dispose does not have an effect here
}
Assert.False(enumerator.MoveNext());
Assert.False(enumerator.MoveNext());
// NB: Current property on generic enumerator doesn't throw; this is consistent with List<T>.
enumerator.Reset();
}
}
public IEnumerator <TExpression> /*!*/ GetEnumerator()
{
if (_expressions != null)
{
return(_expressions.GetEnumerator());
}
return(GetItemEnumerator());
}
private static void AssertEmpty <T>(ReadOnlyCollectionBuilder <T> rocb)
{
Assert.Equal(0, rocb.Count);
Assert.False(rocb.Contains(default(T)));
Assert.False(rocb.Remove(default(T)));
Assert.InRange(rocb.IndexOf(default(T)), int.MinValue, -1);
IEnumerator <T> e = rocb.GetEnumerator();
Assert.False(e.MoveNext());
}
public void ReadOnlyCollectionBuilder_IEnumeratorOfT_Versioning_Reset(int index, Action <ReadOnlyCollectionBuilder <int> > edit)
{
var rocb = new ReadOnlyCollectionBuilder <int>(new[] { 1, 2, 3 });
IEnumerator <int> enumerator = rocb.GetEnumerator();
Assert.True(enumerator.MoveNext());
edit(rocb);
Assert.Throws <InvalidOperationException>(() => enumerator.Reset());
}