print out deprecation notice about old signal handling

Author: hone

lib/resque/worker.rb

@@ -248,6 +248,7 @@ def fork
 
     # Runs all the methods needed when a worker begins its lifecycle.
     def startup
+      warn "WARNING: This way of doing signal handling is now deprecated. Please see http://hone.heroku.com/resque/2012/08/21/resque-signals.html for more info." unless term_child
       enable_gc_optimizations
       register_signal_handlers
       prune_dead_workers

test/test_helper.rb

@@ -160,3 +160,15 @@ def now
 
   self.fake_time = nil
 end
+
+def capture_stderr
+  # The output stream must be an IO-like object. In this case we capture it in
+  # an in-memory IO object so we can return the string value. You can assign any
+  # IO object here.
+  previous_stderr, $stderr = $stderr, StringIO.new
+  yield
+  $stderr.string
+ensure
+  # Restore the previous value of stderr (typically equal to STDERR).
+  $stderr = previous_stderr
+end

test/worker_test.rb

@@ -571,5 +571,18 @@ def self.perform( run_time, rescue_time=nil )
         end
       end
     end
+
+    test "displays warning when not using term_child" do
+      stderr = capture_stderr { @worker.work(0) }
+
+      assert stderr.match(/^WARNING:/)
+    end
+
+    test "it does not display warning when using term_child" do
+      @worker.term_child = "1"
+      stderr = capture_stderr { @worker.work(0) }
+
+      assert !stderr.match(/^WARNING:/)
+    end
   end
 end