Code Coverage in XCode 4.3

[affogato]

Has anyone found a neat way to test code coverage in Xcode 4.3?

[Jasper Blues]

Yep - don't link to libprofile_rt.dylib, because if you set the following settings: 

-- Instrument Program Flow : YES

--Generate Test Coverage Files : YES

. . . then it will link to the lib profile for you. 

Also (important), there's a bug in a function mapping that can be corrected by adding a class to you project like so: 

#import <Foundation/Foundation.h>

/**

* This fixes a problem related to an Apple implementation of a core unix api.

*/

@interface CoverageFix : NSObject

FILE* fopen$UNIX2003(const char* filename, const char* mode);

size_t fwrite$UNIX2003(const void* ptr, size_t size, size_t nitems, FILE* stream);

@end

#import "CoverageFix.h"

@implementation CoverageFix

FILE* fopen$UNIX2003(const char* filename, const char* mode) {

    return fopen(filename, mode);

}

size_t fwrite$UNIX2003(const void* ptr, size_t size, size_t nitems, FILE* stream) {

    return fwrite(ptr, size, nitems, stream);

}

@end

Having done that you'll have .gcda files in your build products directory. You can turn them into a report with Cover Story, but I like to use lcov to produce HTML reports. The advantage of this is: 

1. A cmd-line build that can be run either on the devs machine or on the CI server, with same setup. 

2. Ability to add coverage assertions - so that the build fails with insufficient coverage. 

There's an example of a build that does this here: https://github.com/expanz/xcode-editor/blob/master/build.xml

Plus it can publish the coverage report back to github: http://expanz.github.com/xcode-editor/coverage/Users/jblues/ExpanzProjects/xcode-editor1/Source/Main/index.html

Let me know if you need any help. 

Jasper

On Mar 5, 2012, at 6:48 PM, affogato wrote:

Has anyone found a neat way to test code coverage in Xcode 4.3?

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[Stewart Gleadow]

I tried to get it up and running, but it fails because libprofile_rt can't be found. I looked inside the new Developer dir inside Xcode.app, and I can't see the lib directory where it used to sit...

- Stew

On 05/03/2012, at 9:48 PM, affogato wrote:

> Has anyone found a neat way to test code coverage in Xcode 4.3?
>

[Stewart Gleadow]

Ah nice. I should have been slower with my reply. I didn't realise the libprofile_rt link happened for you. I'm going to try this tomorrow.

- Stew

[Jasper Blues]

It's in here: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib

. . . but I found if you just set the two parameters (not the C flags) (see my other email) its more stable. Not sure why. . .