Re: [nunitv3] Re: Another Question of Naming

Hi Olof, 

> 2008/9/9 Charlie Poole <[email protected]>:
> >
> > Hi All,
> >
> > I'm still not happy with one of the attribute names we are 
> using for 
> > parameterized tests, so I'm asking for ideas, opinions and 
> > suggestions.
> >
> > Here's what we have now...
> >
> > You can specify entire test cases together or individual values for 
> > parameters, which NUnit then combines into test cases using various 
> > strategies.
> >
> > If you go with full test cases, they can either be inline or 
> > separately named and referenced...
> >  TestCase( 1.2, 3.0 )   // Inline
> >  TestCases( "myCases")  // Separate
> >
> > Similarly, if you go with individual parameters, they can 
> be inline or 
> > separate...
> >  Values(12, 7, 3)       // Inline
> >  DataSource("myValues") // Separate
> 
> I'm not 100% how this "paramater values" version of test cases work.
> 
> I understand TestCase and TestCases (even though TestCases is 
> a bit ambious to me since it actually specifies a named 
> source of TestCase-tuples, but it's so readable anyway)

Yes, I considered TestCaseSource, which is literally more exact,
but I liked TestCases with the notion being "The test cases are
to be found here"
 
> Could you give an example of the Values, DataSource including 
> a [Test]-method (or TestCase method if that is the way to use them..)?

Here's one - a bit contrived, but illustrative...

[Test]
public void AdditionIsCommutative(
	[Values(0, 1, 42, 99)] int a,
	[Values(1000, 2000)]int b)
{
	Assert.That( a+b == b+a );
}

Since the default strategy is combinatorial, this would
generate 8 test cases.

The equilent with datasource would use
[DataSource("xxxxx")] and [DataSource("yyyyy")]
for the attributes, were xxxxx and yyyyy would
be declared elsewhere in the class, probably
as arrays of ints.

Specifying parameter values separately is a key
to more advanced techniques like Pariwise and
Combinatorial testing and Theories.

I've also used it with a Sequential strategy
(just use the args in sequence) when I needed
to pass argument 1 to method 1 and arguments 
1 and 2 to method 2.

Charlie

> >
> > We'll be adding others - cases in a spreadsheet, etc. - but 
> these are 
> > the four basic ones.
> >
> > I'm quite happy with TestCase, TestCases and Values.
> > I find them quite readable and others have said the same.
> >
> > But DataSource strikes me as a bit too generic. It doesn't tell me 
> > that it's a set of single parm values rather than a test case. It 
> > sounds like it might have something to do with a DB. But 
> for the life 
> > of me I can't think of anything better.
> >
> > Ideas?
> >
> > Charlie
> >
> >
> >
> >
> > >
> >
> 
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