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@@ -18,6 +18,37 @@
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     end
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   end
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+  context "An attachment" do
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+    setup do
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+      rebuild_model :styles => { :thumb => "50x50#" }
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+      @dummy = Dummy.new
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+      @file = File.new(File.join(File.dirname(__FILE__),
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+                                 "fixtures",
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+                                 "5k.png"))
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+      @dummy.avatar = @file
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+      assert @dummy.save
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+    end
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+
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+    should "create its thumbnails properly" do
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+      assert_match /\b50x50\b/, `identify '#{@dummy.avatar.path(:thumb)}'`
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+    end
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+
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+    context "redefining its attachment styles" do
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+      setup do
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+        Dummy.class_eval do
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+          has_attached_file :avatar, :styles => { :thumb => "150x25#" }
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+        end
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+        @d2 = Dummy.find(@dummy.id)
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+        @d2.avatar.reprocess!
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+        @d2.save
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+      end
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+
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+      should "create its thumbnails properly" do
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+        assert_match /\b150x25\b/, `identify '#{@dummy.avatar.path(:thumb)}'`
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+      end
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+    end
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+  end
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+
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   context "A model with no attachment validation" do
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     setup do
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       rebuild_model :styles => { :large => "300x300>",