From: Philipp Meier <meier@...>
Date: 2002-10-04T03:37:55+09:00
Subject: Re: Reusing base classes tests?


--4SFOXa2GPu3tIq4H
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Fri, Oct 04, 2002 at 02:06:06AM +0900, Phlip wrote:
> >> Classes, however, should follow LSP, so tests a base class should pass
> >> the derived class should pass too.
>=20
> Philipp Meier wrote:
>=20
> > How should Truck pass CarTest? Or should TruckTest inherite from CarTest
> > and override test_wheels? Would this be according to LSP?
>=20
> LSP means the caller (in this case the test engine) can't tell we called=
=20
> one test or another. That's fine because tests should not push side-effec=
ts=20
> into the engine.

Ok, now I unterstood. Keeping the Car metaphor LSP meens e.g. that the
method "turn_key_to_off_position" should not e.g. turn off the lights in
the car class but do so in the truck class!? (Consider turning of the
lights as a possible side-effect.)

-billy.

--=20
Meisterbohne       S=F6flinger Stra=DFe 100          Tel: +49-731-399 499-0
   eL=F6sungen       89077 Ulm                     Fax: +49-731-399 499-9

--4SFOXa2GPu3tIq4H
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.0 (GNU/Linux)

iD8DBQE9nI50fBriNoqItSYRAr4gAJ9oI3nScEhFlwi3grRO8lISNWnA2gCfU7UU
H4ttyd5/myMy2/phI5DcddU=
=Od3c
-----END PGP SIGNATURE-----

--4SFOXa2GPu3tIq4H--