[Generator::Xcconfig] Add support for XCTest

Closes #1366

Gemfile.lock

@@ -17,7 +17,7 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
-  revision: 092a12526563550eb70c5c479bc2cea37b43a030
+  revision: d7bacd932526540b6d447dcb4358cec2822a68f9
   branch: master
   specs:
     xcodeproj (0.10.1)

lib/cocoapods/generator/xcconfig/xcconfig_helper.rb

@@ -106,7 +106,8 @@ module Pod
         # @return [void]
         #
         def self.add_developers_frameworks_if_needed(xcconfig)
-          if xcconfig.frameworks.include?('SenTestingKit')
+          matched_frameworks = xcconfig.frameworks & ['XCTest', 'SenTestingKit']
+          unless matched_frameworks.empty?
             search_paths = xcconfig.attributes['FRAMEWORK_SEARCH_PATHS'] ||= ''
             DEVELOPER_FRAMEWORKS_SEARCH_PATHS.each do |search_path|
               unless search_paths.include?(search_path)

spec/unit/generator/xcconfig/xcconfig_helper_spec.rb

@@ -156,6 +156,15 @@ module Pod
             frameworks_search_paths.should.include?('"$(SDKROOT)/Developer/Library/Frameworks"')
             frameworks_search_paths.should.include?('"$(DEVELOPER_LIBRARY_DIR)/Frameworks"')
           end
+
+          it "adds the developer frameworks search paths to the xcconfig if XCTest has been detected" do
+            xcconfig = Xcodeproj::Config.new({'OTHER_LDFLAGS' => '-framework XCTest'})
+            @sut.add_developers_frameworks_if_needed(xcconfig)
+            frameworks_search_paths = xcconfig.to_hash['FRAMEWORK_SEARCH_PATHS']
+            frameworks_search_paths.should.include?('$(inherited)')
+            frameworks_search_paths.should.include?('"$(SDKROOT)/Developer/Library/Frameworks"')
+            frameworks_search_paths.should.include?('"$(DEVELOPER_LIBRARY_DIR)/Frameworks"')
+          end
         end
 
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