fixup config path

Author: ianfixes

lib/arduino_ci/arduino_backend.rb

@@ -96,7 +96,7 @@ def config_file_path=(rhs)
     #
     # @return [Pathname] the path to use for a given OS
     def config_file_cli_param
-      OS.linux? ? config_file_path : @config_dir
+      OS.osx? ? @config_dir : config_file_path
     end
 
     # Get an acceptable filename for use as a config file

spec/arduino_installation_spec.rb

@@ -79,10 +79,10 @@ def config_fail_msg
         expect(config_dir).to exist
         expect(config_file).to exist
         ret = ArduinoCI::Host.run_and_capture(*bug_753_cmd(backend, config_file))
-        if OS.linux?
-          expect(ret[:out].lines[0]).to include(config_success_msg(config_file))
-        else
+        if OS.osx?
           expect(ret[:out].lines[0]).to include(config_fail_msg)
+        else
+          expect(ret[:out].lines[0]).to include(config_success_msg(config_file))
         end
       end
     end
@@ -103,10 +103,10 @@ def config_fail_msg
         expect(config_dir).to exist
         expect(config_file).to exist
         ret = ArduinoCI::Host.run_and_capture(*bug_753_cmd(backend, config_dir))
-        if OS.linux?
-          expect(ret[:out].lines[0]).to include(config_fail_msg)
-        else
+        if OS.osx?
           expect(ret[:out].lines[0]).to include(config_success_msg(config_file))
+        else
+          expect(ret[:out].lines[0]).to include(config_fail_msg)
         end
       end
     end