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Re: Getting a handle on inf
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Re: Getting a handle on inf


  • Subject: Re: Getting a handle on inf
  • From: Ken Thomases <email@hidden>
  • Date: Mon, 26 Oct 2009 14:46:26 -0500

On Oct 26, 2009, at 2:11 PM, Ian Piper wrote:

On 26 Oct 2009, at 18:45, Greg Parker wrote:

On Oct 26, 2009, at 11:26 AM, Ian Piper wrote:
So I am guessing that when I get a float displayed as "inf" this is not the string it seems to be. Also, it looks like the string value of whatever is coming back is not something that I can use. Can anyone suggest how I might handle a test case like this?

As Kyle noted, -stringValue returns an NSString, not a char*. You'd need to compare to @"inf" and print with %@.

Kyle, Greg,

Thanks for that. I tried it out:

- (void)testVeryLargeNumberShouldReturnInf {
testConverter = Converter.new;
[testConverter setValue:[NSNumber numberWithFloat: 1000000000000000000000000000000000000000.0] forKey:@"originalTemp"];
NSNumber *newTemperatureInF = [NSNumber numberWithFloat:(float) [testConverter convertCToF]];
STAssertEquals(@"inf", [newTemperatureInF stringValue], @"Expecting inf; we got %@", [newTemperatureInF stringValue]);

You want STAssertEqualObjects, here. You want to compare for equal value, not identity, which is what STAssertEquals does.


	[testConverter release];
}

...and I still get a failed build with this message:

Expecting inf; we got inf

Which seems odd. When I look at the transcript for the test result it looks like this:

TCTests.m:58: error: -[TCTests testVeryLargeNumberShouldReturnInf] : '<28810c00 01000000>' should be equal to '<c08a1800 01000000>': Expecting inf; we got inf

So I am still not comparing apples with apples...

Cheers, Ken

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