public void GetEnumerator_NoItems_EmptyEnumerator()
{
SqlBulkCopyColumnOrderHintCollection collection = CreateCollection();
IEnumerator e = collection.GetEnumerator();
Assert.Throws <InvalidOperationException>(() => e.Current);
Assert.False(e.MoveNext());
Assert.Throws <InvalidOperationException>(() => e.Current);
}
public void GetEnumerator_ModifiedCollectionDuringEnumeration_ThrowsInvalidOperationException()
{
SqlBulkCopyColumnOrderHintCollection collection = CreateCollection();
IEnumerator e = collection.GetEnumerator();
collection.Add("column", SortOrder.Ascending);
// Collection changed.
Assert.Throws <InvalidOperationException>(() => e.MoveNext());
Assert.Throws <InvalidOperationException>(() => e.Reset());
}
public void GetEnumerator_ItemsAdded_AllItemsReturnedAndEnumeratorBehavesAsExpected()
{
var item1 = new SqlBulkCopyColumnOrderHint("column1", SortOrder.Ascending);
var item2 = new SqlBulkCopyColumnOrderHint("column2", SortOrder.Descending);
var item3 = new SqlBulkCopyColumnOrderHint("column3", SortOrder.Descending);
SqlBulkCopyColumnOrderHintCollection collection = CreateCollection(item1, item2, item3);
IEnumerator e = collection.GetEnumerator();
const int Iterations = 2;
for (int i = 0; i < Iterations; i++)
{
// Not started
Assert.Throws <InvalidOperationException>(() => e.Current);
Assert.True(e.MoveNext());
Assert.Same(item1, e.Current);
Assert.True(e.MoveNext());
Assert.Same(item2, e.Current);
Assert.True(e.MoveNext());
Assert.Same(item3, e.Current);
Assert.False(e.MoveNext());
Assert.False(e.MoveNext());
Assert.False(e.MoveNext());
Assert.False(e.MoveNext());
Assert.False(e.MoveNext());
// Ended
Assert.Throws <InvalidOperationException>(() => e.Current);
e.Reset();
}
}