public void StringExpression()
{
FakeVariableLinker fvl = new FakeVariableLinker();
StringExpression se = new StringExpression(new StringConst('a'), new StringConst("bbbb"));
Assert.IsTrue(se.GetResult(fvl).Value == "abbbb");
StringExpression se2 = new StringExpression(new StringConst("add"), new StringConst("__bb"));
Assert.IsTrue(se2.GetResult(fvl).Value == "add__bb");
StringExpression se3 = new StringExpression(new ConvertToStringExpression(new DoubleVar(FakeVariableLinker.DoubleB)), new StringConst("bb"));
Assert.IsTrue(se3.GetResult(fvl).Value == "7.8bb");
}