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