Re: [Pyobjc-dev] testing NSCell

[<bb...@ma...>]

Tests committed as 'test_nscell.py' in Lib/AppKit/test/.

I refactored the tests slightly... have a look, they have been comitted.

There is definitely a bug -- but it may be fallout from using an NSCell 
outside of a true application [NSCell is one of the "weird ones", 
IIRC].   Specifically, -floatValue and -intValue are always returning 0.

 >>> from AppKit import *
 >>> c = NSCell.alloc().init()
 >>> c.setIntValue_(5)
 >>> c.intValue()
0
 >>> c.stringValue()
''
 >>> c.setStringValue_('5')
 >>> c.intValue()
5
 >>> c.stringValue()
'5'
 >>>

Huh? Specific problem appears to be with setIntValue_()... how odd.

str(), unicode(), int(), and float() should not work directly on a cell 
instance.  A Cell is not really a data container.   It is a thing that 
draws stuff [and may support editing/clicking].  That it can contain 
data is one of its features, but not a primary feature and not intended 
for persistence [example:  a single cell may be used to draw all of the 
geographic cells in a single column of a table view].

As such, you should generally use the *Value() query methods.

Of course, with that said, it would be trivial to add mappings between 
the various *Value() methods and the appropriate __python method__.  
Something like...

CONVENIENCE_METHODS['floatValue'] = (
     ('__float__', lambda self: self.floatValue()),
)

While trivial, I'm not really sure we *should* add such convenience 
hooks -- I'm exactly on the fence.  What is the Properly Pythonic 
answer?

b.bum

On Tuesday, Feb 4, 2003, at 14:16 US/Eastern, David Eppstein wrote:

> Which if any of the following tests should fail?  Currently, they all 
> do.
>
> import unittest
> import objc
>
> from AppKit import NSCell
>
> class TestNSCell(unittest.TestCase):
>    cell = NSCell.alloc().init()
>
>    def testString(self):
>        s = 'string'
>        self.cell.setStringValue_(s)
>        assert(self.cell.stringValue() == s)
>        assert(str(self.cell) == s)
>
>    def testUnicode(self):
>        u = u'\xc3\xbc\xc3\xb1\xc3\xae\xc3\xa7\xc3\xb8d\xc3\xa8'
>        self.cell.setStringValue_(u)
>        assert(self.cell.stringValue() == u)
>        assert(unicode(self.cell) == u)
>
>    def testInt(self):
>        i = 17
>        self.cell.setIntValue_(i)
>        assert(self.cell.intValue() == i)
>        assert(int(self.cell) == i)
>
>    def testFloat(self):
>        f = 3.14159
>        self.cell.setFloatValue_(f)
>        assert(self.cell.floatValue() == f)
>        assert(float(self.cell) == f)
>
> def suite():
>    suite = unittest.TestSuite()
>    suite.addTest(unittest.makeSuite(TestNSCell))
>    return suite
>
> if __name__ == '__main__':
>    unittest.main( )
>
> --
> David Eppstein       UC Irvine Dept. of Information & Computer Science
> epp...@ic... http://www.ics.uci.edu/~eppstein/
>
>
>
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b.bum
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	... No Foul!