architecture issue on compiling unit test using GHUnit

Question

Am using Xcode 4.5.

Recently i have download GHunit framework and setup it by following link.

On compiling the target, am getting the error mentioned below. need your valuable suggestion.

Undefined symbols for architecture i386:
      "_CACurrentMediaTime", referenced from:
          _GHRunForInterval in GHUnitIOS(GHTestUtils.o)
          _GHRunUntilTimeoutWhileBlock in GHUnitIOS(GHTestUtils.o)
    ld: symbol(s) not found for architecture i386
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

CACurrentMediaTime is declared at CABase.h and implemented at QuartzCore framework, you'll need to link it to the project.

Answer 2

In our mobile application development course at school, we have been using this tutorial http://www.raywenderlich.com/3716/unit-testing-tutorial-for-ios-xcode-4-quick-start-guide

And It does not Run without the QuartzCore.framework as well, so thank you very much !