RE: [Mockobjects-java-users] MockObjects and Factories best practices

[Paul J. <pau...@me...>]

The approach we have been taking is to extend a Factory with a =
MockFactory have a static Factory.setInstance(Factory f) that allows us =
to setup the MockFactory as the real factory.

That is assuming that we use a singleton pattern to return the Factory =
(or MockFactory) with the static Factory.instance() method.

Is this the best approach or is there a better one?

For example, the code would look like this...

	public class Factory {
		private Factory factory =3D null;

		public static instance() {
			if (factory =3D=3D null) {
				factory =3D new Factory();
			}
			return factory;
		}

		public static setInstance(Factory pFactory) {
			factory =3D pFactory;
		}

		public Bean getBean() {
			return new Bean();
		}
	}

	public class MockFactory extends Factory {
		public Bean getBean() {
			return new MockBean();
		}
	}


Paul Jackson
Meridian Informatics

Phone: (02) 8233 7564
Mobile: 0418 855 496




-----Original Message-----
From: moc...@li...
[mailto:moc...@li...]On Behalf Of
Olaf Kock
Sent: Friday, 28 June 2002 3:43 AM
To: Moc...@li...
Subject: Re: [Mockobjects-java-users] MockObjects and Factories best
practices


Hi John,

John Sisk wrote:
>=20
> Hi there,
>=20
> What is the best practice for integrating mocks into a project?=20

The key point is to shift object creation from classes to be
tested to somewhere outside. That doesn't necessarily meen a
factory to be involved, but the class in question will be
parameterized with their collaborators from somewhere outside
(probably/sometimes in the constructor).

This way production code constructs objects and parameterizes
them with "real" collaborators (and may do so with the use of
factories or builders). Testcode on the other hand directly
creates objects under test and parameterizes them with
MockObjects suiting its particular needs.

Don't pollute factories with mockobjects. (That is - if you
wanted to ask that and I understood correctly). Production
code should be able to be delivered without any MockObject.

Hope that helps?

Olaf

--=20

abstrakt gmbh, Behringstrasse 16b, 22765 Hamburg=20
Tel: +49-40-39804630, Fax: +49-40-39804639

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