serial driver

interface

uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
function TestDouble: Double;
{ Private declarations }
public
{ Public declarations }
end;

ITest = interface(IInvokable)
['{DE3ACD58-A748-4528-A2A6-13C7A9247DB2}']
function GetDate: TDateTime;
property Date: TDateTime read GetDate;
end;

var
Form1: TForm1;

implementation

uses
Delphi.Mocks;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
mock: TMock<ITest>;
test: ITest;
begin
mock := TMock<ITest>.Create;
mock.Setup.WillReturn(Date).When.GetDate;
Button1.Tag := Trunc(TestDouble);
test := mock;
Button1.Caption := DateToStr(test.GetDate);
end;

function TForm1.TestDouble: Double;
begin
Result := 123;
end;