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@@ -20,7 +20,6 @@ class Module
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     methods.each do |method|
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       aliased_method, punctuation = method.to_s.sub(/([?!=])$/, ''), $1
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-      
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       if instance_methods.include?("#{aliased_method}_without_synchronization#{punctuation}")
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         raise ArgumentError, "#{method} is already synchronized. Double synchronization is not currently supported."
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       end

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@@ -40,7 +40,7 @@ class SynchronizationTest < Test::Unit::TestCase
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     end
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   end
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-  def test_mutex_is_entered_during_method_call
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+  def dummy_sync
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     dummy = Object.new
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     def dummy.synchronize
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       @sync_count ||= 0
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@@ -48,11 +48,15 @@ class SynchronizationTest < Test::Unit::TestCase
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       yield
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     end
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     def dummy.sync_count; @sync_count; end
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-    @target.mutex = dummy
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+    dummy
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+  end
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+
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+  def test_mutex_is_entered_during_method_call
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+    @target.mutex = dummy_sync
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     @target.synchronize :to_s, :with => :mutex
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     @instance.to_s
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     @instance.to_s
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-    assert_equal 2, dummy.sync_count
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+    assert_equal 2, @target.mutex.sync_count
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   end
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   def test_can_synchronize_method_with_punctuation
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@@ -68,4 +72,14 @@ class SynchronizationTest < Test::Unit::TestCase
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     @instance.dangerous!
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     assert @instance.dangerous?
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   end
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+
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+  def test_can_synchronize_singleton_methods
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+    @target.mutex = dummy_sync
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+    class << @target
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+      synchronize :to_s, :with => :mutex
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+    end
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+    assert @target.respond_to?(:to_s_without_synchronization)
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+    assert_nothing_raised { @target.to_s; @target.to_s }
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+    assert_equal 2, @target.mutex.sync_count
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+  end
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 end
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