Ensure blocks given to subscriber are properly yield

activesupport/lib/active_support/log_subscriber/test_helper.rb

@@ -61,11 +61,12 @@ module ActiveSupport
           @logged = Hash.new { |h,k| h[k] = [] }
         end
 
-        def debug
-        end
-
         def method_missing(level, message)
-          @logged[level] << message
+           if block_given?
+             @logged[level] << yield
+           else
+             @logged[level] << message
+           end
         end
 
         def logged(level)

activesupport/test/log_subscriber_test.rb

@@ -11,7 +11,7 @@ class MyLogSubscriber < ActiveSupport::LogSubscriber
 
   def foo(event)
     debug "debug"
-    info "info"
+    info { "info" }
     warn "warn"
   end