Link `swiftSwiftOnoneSupport` for test xcconfigs

CHANGELOG.md

@@ -38,6 +38,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
   [#6767](https://github.com/CocoaPods/CocoaPods/pull/6767)
 
+* Link `swiftSwiftOnoneSupport` for test xcconfigs  
+  [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
+  [#6769](https://github.com/CocoaPods/CocoaPods/pull/6769)
+
 * Ensure product name for tests is not overridden by custom build settings  
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
   [#6766](https://github.com/CocoaPods/CocoaPods/pull/6766)

Gemfile.lock

@@ -31,7 +31,7 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
-  revision: 7355a4eac5d3634725e0925cfbfa46fbcd88b933
+  revision: 76932aa3dce97408361b0cd485deff9a77e3bcb4
   branch: master
   specs:
     xcodeproj (1.4.4)
@@ -291,4 +291,4 @@ DEPENDENCIES
   xcodeproj!
 
 BUNDLED WITH
-   1.14.6
+   1.15.0

lib/cocoapods/installer/xcode/pods_project_generator/pod_target_installer.rb

@@ -303,12 +303,25 @@ module Pod
 
               target.test_native_targets.each do |test_target|
                 test_target.build_configurations.each do |test_target_bc|
+                  test_target_swift_debug_hack(test_target_bc)
                   test_target_bc.base_configuration_reference = xcconfig_file_ref
                 end
               end
             end
           end
 
+          # Manually add `libswiftSwiftOnoneSupport.dylib` as it seems there is an issue with tests that do not include it for Debug configurations.
+          # Possibly related to Swift module optimization.
+          #
+          # @return [void]
+          #
+          def test_target_swift_debug_hack(test_target_bc)
+            return unless test_target_bc.debug?
+            return unless [target, *target.recursive_dependent_targets].any?(&:uses_swift?)
+            ldflags = test_target_bc.build_settings['OTHER_LDFLAGS'] ||= '$(inherited)'
+            ldflags << ' -lswiftSwiftOnoneSupport'
+          end
+
           # Creates a build phase which links the versioned header folders
           # of the OS X into the framework bundle's root root directory.
           # This is only necessary because the way how headers are copied

spec/unit/generator/xcconfig/pod_xcconfig_spec.rb

@@ -148,11 +148,24 @@ module Pod
             @coconut_pod_target.stubs(:file_accessors).returns(file_accessors)
           end
 
+          it 'includes correct other ld flags' do
+            generator = PodXCConfig.new(@coconut_pod_target, true)
+            xcconfig = generator.generate
+            xcconfig.to_hash['OTHER_LDFLAGS'].should == '-ObjC -l"CoconutLib"'
+          end
+
+          it 'includes correct other ld flags when requires frameworks' do
+            @coconut_pod_target.stubs(:requires_frameworks?).returns(true)
+            generator = PodXCConfig.new(@coconut_pod_target, true)
+            xcconfig = generator.generate
+            xcconfig.to_hash['OTHER_LDFLAGS'].should == '-ObjC -framework "CoconutLib"'
+          end
+
           it 'includes other ld flags for test dependent targets' do
             @coconut_pod_target.test_dependent_targets = [@monkey_pod_target]
             generator = PodXCConfig.new(@coconut_pod_target, true)
             xcconfig = generator.generate
-            xcconfig.to_hash['OTHER_LDFLAGS'].should.include '-l"monkey" -framework "dynamic-monkey"'
+            xcconfig.to_hash['OTHER_LDFLAGS'].should == '-ObjC -l"CoconutLib" -l"monkey" -framework "dynamic-monkey"'
           end
 
           it 'adds settings for test dependent targets' do

spec/unit/installer/xcode/pods_project_generator/pod_target_installer_spec.rb

@@ -195,6 +195,19 @@ module Pod
                 @coconut_pod_target.test_native_targets.count.should == 1
               end
 
+              it 'adds swiftSwiftOnoneSupport ld flag to the debug configuration' do
+                @coconut_pod_target.stubs(:uses_swift?).returns(true)
+                @installer.install!
+                native_test_target = @project.targets[1]
+                debug_configuration = native_test_target.build_configurations.find(&:debug?)
+                debug_configuration.build_settings['OTHER_LDFLAGS'].sort.should == [
+                  '$(inherited)',
+                  '-lswiftSwiftOnoneSupport',
+                ]
+                release_configuration = native_test_target.build_configurations.find { |bc| bc.type == :release }
+                release_configuration.build_settings['OTHER_LDFLAGS'].should.be.nil
+              end
+
               it 'adds files to build phases correctly depending on the native target' do
                 @installer.install!
                 @project.targets.count.should == 2