public void CoalesceTest()
{
LinqToSparqlExpTranslator<Track> target = new LinqToSparqlExpTranslator<Track>();
target.TypeTranslator = new XsdtTypeConverter();
string testVal = "hello";
string defaultVal = "world";
Expression e = Expression.Coalesce(Expression.Constant(testVal), Expression.Constant(defaultVal));
target.StringBuilder = new StringBuilder();
target.Coalesce(e);
}