public void RRegionBuilder_ConstructionTest() {
TextBufferMock textBuffer = new TextBufferMock(string.Empty, RContentTypeDefinition.ContentType);
EditorTree tree = new EditorTree(textBuffer);
EditorDocumentMock editorDocument = new EditorDocumentMock(tree);
ROutlineRegionBuilder ob = new ROutlineRegionBuilder(editorDocument);
ob.EditorDocument.Should().NotBeNull();
ob.EditorTree.Should().NotBeNull();
editorDocument.DocumentClosing.GetInvocationList().Should().ContainSingle();
FieldInfo treeUpdateField = tree.GetType().GetField("UpdateCompleted", BindingFlags.Instance | BindingFlags.NonPublic);
var d = (MulticastDelegate)treeUpdateField.GetValue(tree);
d.GetInvocationList().Should().ContainSingle();
ob.Dispose();
editorDocument.DocumentClosing.Should().BeNull();
treeUpdateField.GetValue(tree).Should().BeNull();
}
