Fix preexisting tests after adding default hooks

lib/guard.rb

@@ -62,8 +62,9 @@ module Guard
     # fire it if his work leads to a system failure
     def supervised_task(guard, task_to_supervise, *args)
       guard.hook "#{task_to_supervise.to_s}_begin"
-      guard.send(task_to_supervise, *args)
+      result = guard.send(task_to_supervise, *args)
       guard.hook "#{task_to_supervise.to_s}_end"
+      result
     rescue Exception
       UI.error("#{guard.class.name} guard failed to achieve its <#{task_to_supervise.to_s}> command: #{$!}")
       ::Guard.guards.delete guard

lib/guard/guard.rb

@@ -1,5 +1,7 @@
 module Guard
   class Guard
+    include Hook
+
     attr_accessor :watchers, :options
 
     def initialize(watchers = [], options = {})

spec/guard_spec.rb

@@ -54,7 +54,7 @@ describe Guard do
     describe ".supervised_task" do
       subject { ::Guard.setup }
       before(:each) do
-        @g = mock(Guard::Guard)
+        @g = mock(Guard::Guard).as_null_object
         subject.guards.push(@g)
       end
 
@@ -92,6 +92,8 @@ describe Guard do
           failing_result.message.should == 'I break your system'
         end
       end
+
+      it "calls the default hooks"
     end
   end