Add spec to make sure :after_fork hook is not called when the worker hasn't forked.

Author: kjwierenga

test/worker_test.rb

@@ -520,6 +520,19 @@ def self.perform
     assert !$AFTER_FORK_CALLED
   end
 
+  it "Will not call an after_fork hook when the worker can't fork" do
+    Resque.redis.flushall
+    $AFTER_FORK_CALLED = false
+    Resque.after_fork = Proc.new { $AFTER_FORK_CALLED = true }
+    workerA = Resque::Worker.new(:jobs)
+    workerA.cant_fork = true
+
+    assert !$AFTER_FORK_CALLED
+    Resque::Job.create(:jobs, SomeJob, 20, '/tmp')
+    workerA.work(0)
+    assert !$AFTER_FORK_CALLED
+  end
+
   it "returns PID of running process" do
     assert_equal @worker.to_s.split(":")[1].to_i, @worker.pid
   end