Undefined symbols for architecture i386:
"_OBJC_CLASS_$_ItemReturn", referenced from:
objc-class-ref in JenknisDemoTests.o
"_OBJC_CLASS_$_ViewController", referenced from:
objc-class-ref in ViewControllerTest.o
(maybe you meant: _OBJC_CLASS_$_ViewControllerTest)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决方法： edit scheme，然后在build选项中找到对应出错的target，然后去掉run的勾选就可以了。
ios unit test 工程选择release时候报错Undefined symbols for architecture i386
原文：http://www.cnblogs.com/lisa090818/p/4226576.html