Remove duplicate methods

lib/serverspec/backend/exec.rb

@@ -2,20 +2,7 @@
 
 module Serverspec
   module Backend
-    class Exec
-      include Singleton
-
-      def set_commands(c)
-        @commands = c
-      end
-
-      def set_example(e)
-        @example = e
-      end
-
-      def commands
-        @commands
-      end
+    class Exec < Base
 
       def run_command(cmd, opts={})
         cmd = build_command(cmd)
@@ -52,16 +39,6 @@ def add_pre_command(cmd)
         cmd
       end
 
-      def check_zero(cmd, *args)
-        ret = run_command(commands.send(cmd, *args))
-        ret[:exit_status] == 0
-      end
-
-      # Default action is to call check_zero with args
-      def method_missing(meth, *args, &block)
-        check_zero(meth, *args)
-      end
-
       def check_running(process)
         ret = run_command(commands.check_running(process))
         if ret[:exit_status] == 1 || ret[:stdout] =~ /stopped/