public static void MakeSelection(
this Mock <ITextSelection> selection,
NormalizedSnapshotSpanCollection col)
{
selection.Setup(x => x.Mode).Returns(TextSelectionMode.Box);
selection.Setup(x => x.SelectedSpans).Returns(col);
var start = col.Min(x => x.Start);
var end = col.Min(x => x.End);
selection
.Setup(x => x.StreamSelectionSpan)
.Returns(new VirtualSnapshotSpan(new SnapshotSpan(start, end)));
}