public virtual void SetUp()
{
SourceNode = ExpressionNodeObjectMother.CreateMainSource();
ClauseGenerationContext = new ClauseGenerationContext(ExpressionTreeParser.CreateDefaultNodeTypeProvider());
QueryModel = SourceNode.Apply(null, ClauseGenerationContext);
SourceClause = QueryModel.MainFromClause;
SourceReference = (QuerySourceReferenceExpression)QueryModel.SelectClause.Selector;
}