public void NoFold()
{
var builders = GetSimpleAndConstantFoldingBuilder();
SimpleExprBuilder sfb = builders.Item1;
ConstantFoldingExprBuilder cfb = builders.Item2;
var arg0 = GetVarAndIdExpr("x", BasicType.GetBvType(8)).Item2;
var arg1 = GetVarAndIdExpr("y", BasicType.GetBvType(8)).Item2;
var simpleResult = sfb.BVSUB(arg0, arg1);
var result = cfb.BVSUB(arg0, arg1);
CheckIsBvType(result, 8);
CheckIsBvType(simpleResult, 8);
Assert.IsNull(ExprUtil.AsLiteral(result));
Assert.IsNotNull(ExprUtil.AsBVSUB(result));
Assert.IsTrue(ExprUtil.StructurallyEqual(result, simpleResult));
}