move mounted? to file common. Thanks @arlimus

lib/train/extras/file_common.rb

@@ -102,6 +102,10 @@ def unix_mode_mask(owner, type)
       t & o
     end
 
+    def mounted?
+      !mounted.nil? && !mounted.stdout.nil? && !mounted.stdout.empty?
+    end
+
     # helper methods provided to any implementing class
 
     private

lib/train/extras/linux_file.rb

@@ -49,10 +49,6 @@ def mounted
       )
     end
 
-    def mounted?
-      !mounted.stdout.empty?
-    end
-
     %w{
       type mode owner group mtime size selinux_label
     }.each do |field|

lib/train/transports/mock.rb

@@ -127,9 +127,5 @@ def mounted
         @runtime.run_command("mount | grep -- ' on #{@path}'")
       )
     end
-
-    def mounted?
-      !mounted.stdout.empty?
-    end
   end
 end