Re: How to extend the constraint model with customconstraints

I like the concept, but I've been unable to make it work without 
extension methods. So how did you do it?
 
Charlie


  _____  

From: [email protected]
[mailto:[email protected]] On Behalf Of Simone
Busoli
Sent: Thursday, August 07, 2008 2:00 PM
To: [email protected]
Subject: Re: [Nunit-users] How to extend the constraint model with
customconstraints


I've TDDed it for some minutes and I found it's simpler than I thought. I
can do this now:

Assert.That(2 + 2).Iz.EqualTo(4);
Assert.That(2 + 2).Iz.Not.EqualTo(5);
Assert.That( list).Iz.EqualTo(new string[] { "foo", "bar" });
Assert.That(7).Iz.GreaterThan(3);
Assert.That(7).Iz.Not.GreaterThan(8);
Assert.That(7).Iz.GreaterThanOrEqualTo(7);

I know this would be a breaking change Charlie, but don't you think this
could be better than the constraint model?
The advantages I see are:

- discoverability: just type DOT after That and you see what you have
available
- fluency
- extensibility

Thoughts?


On Thu, Aug 7, 2008 at 9:47 PM, Simone Busoli <[email protected]>
wrote:


What about, instead of this:

Assert.That(value, Is.Not.EqualTo(other));

this one?

Assert.That(value).Is.Not.EqualTo(other));

I don't know it if would ever work, but I like it more, and I think it could
be extensible since Is/Has is no longer forced to be a static class. 


On Thu, Aug 7, 2008 at 9:39 PM, Simone Busoli <[email protected]>
wrote:


What's the best way of adding a new constraint so that I can use it,
preferably before a patch is submitted, applied and a new version is
released?
I am thinking about extension methods, but the classes Is, Has... expose
constraints with static methods. I can create my constraint manually in the
second argument of Assert.That, but I would lose the fluency of the syntax.

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