Delphi unit testing compare two strings returns false but are the same

I am trying to compare the first entry in a TstringList. The compiler doesn't return any errors but when I run the test the first test passes and the second test receives a failed test of:

first entry did not go in : "sky - I believe I can fly" should be : "sky - I believe I can fly"

Here is my code.

procedure TestTForm1.TestButtonAddExecute;
var
    Sender: TObject;
    Stemp : string;
begin
    Stemp := 'sky - I believe I can fly';
    txtInput.Text := Stemp;
    FForm1.ButtonAddExecute(Sender);
    // TODO: Validate method results
    Check(FForm1.txtInput.Text='', 'Input text did not clear after adding : "'+FForm1.txtInput.Text+ '" should be :"'+Stemp+'"');
    Check(FForm1.ListBox.Items[1]= Stemp,'first entry did not go in : "'+Stemp +'" should be : "' +Stemp+'"');
end;

Any point in the right direction would be nice. Thank you.