How to access fields of a TTestCase in a TTestSetup class

Question

I am creating unit tests with DUnit. I have a class that takes quite a long time to initialize.

I derive a class TMyTestSetup from TTestSetup and override its Setup met

Answer 1

Using TTestSetup you could do something like this:

type
  TMyTestSetup = class(TTestSetup)
  private
    FValue: Integer;
  protected
    procedure SetUp; override;
    procedure TearDown; override;
  end;

  TMyTestCase = class(TTestCase)
  published
    procedure TestSomething;
  end;

var
  TestSetup: TMyTestSetup;

procedure TMyTestSetup.SetUp;
begin
  inherited;
  TestSetup := Self;
  FValue := 42;
end;

procedure TMyTestSetup.TearDown;
begin
  TestSetup := nil;
  inherited;
end;

procedure TMyTestCase.TestSomething;
begin
  CheckEquals(TestSetup.FValue, 42);
end;

initialization
  TestFramework.RegisterTest(TMyTestSetup.Create(
    TTestSuite.Create('My test suite', [TMyTestCase.Suite])
  ));

It feels somewhat revolting mind you, but it does the job!