使用cocoapods配置单元测试target时出现警告

当在主APP和unit test的target中都需要使用到某一个库，且这时使用pod进行配置时，如果给两个target都配置了改库，就会有一个Class is implemented in both warning when running unit tests 的警告：

形式如下：

Class AFQueryStringPair is implemented in both
/XXX/DuplicateClassImplementation.app/DuplicateClassImplementation and
/XXX/DuplicateClassImplementationTests.xctest/DuplicateClassImplementationTests.
One of the two will be used. Which one is undefined.

可以修改Podfile避免此问题，主要是让单元测试的target继承主app的search path：

target 'App' do
    pod 'GoogleAnalytics' , '~> 3.0'
    pod 'GoogleTagManager' , '~> 3.0'

     pod 'SDWebImage', '~>3.7'
     platform :ios, '8.0'
     use_frameworks!

     target 'App Unit Tests' do
         inherit! :search_paths
     end
 end

 target 'App Enterprise' do
     pod 'GoogleAnalytics' , '~> 3.0'
     pod 'GoogleTagManager' , '~> 3.0'

     pod 'SDWebImage', '~>3.7'
     platform :ios, '8.0'
     use_frameworks!
 end