public void EvaluateStringConstantExpression()
 {
     ConstantExpression expr = new ConstantExpression("Adam");
     Assert.AreEqual("Adam", expr.Evaluate(null));
 }
 public void CreateIntegerConstantExpression()
 {
     ConstantExpression expr = new ConstantExpression(1);
     Assert.AreEqual(1, expr.Value);
 }