diff --git a/Makefile b/Makefile
index bf69a84..47d8561 100644
--- a/Makefile
+++ b/Makefile
@@ -53,6 +53,16 @@ $(CMAPDST)/to-unicode-Adobe-Korea1.pickle.gz: $(CMAPDST)
 	$(CONV_CMAP) -c KSC-EUC=euc-kr -c KSC-Johab=johab -c KSCms-UHC=cp949 -c UniKS-UTF8=utf-8 \
 		$(CMAPDST) Adobe-Korea1 $(CMAPSRC)/cid2code_Adobe_Korea1.txt
 
+unittest:
+	$(PYTHON) -m doctest \
+		pdfminer/arcfour.py \
+		pdfminer/lzw.py \
+		pdfminer/ascii85.py \
+		pdfminer/runlength.py \
+		pdfminer/rijndael.py
+	$(PYTHON) pdfminer/ccitt.py
+	$(PYTHON) pdfminer/psparser.py
+
 test: cmap
 	cd samples && $(MAKE) test
 test_clean:
diff --git a/samples/nonfree/naacl06-shinyama.xml.ref b/samples/nonfree/naacl06-shinyama.xml.ref
index 228b90d..d3b13a1 100644
--- a/samples/nonfree/naacl06-shinyama.xml.ref
+++ b/samples/nonfree/naacl06-shinyama.xml.ref
@@ -3750,11 +3750,11 @@
 </textgroup>
 </textgroup>
 <textgroup bbox="313.198,119.636,540.091,607.829">
+<textgroup bbox="313.198,336.837,540.091,607.829">
 <textbox id="11" bbox="313.198,513.386,540.091,607.829" />
-<textgroup bbox="313.198,119.636,540.091,512.573">
 <textbox id="12" bbox="313.198,336.837,540.091,512.573" />
-<textbox id="13" bbox="313.198,119.636,540.091,336.023" />
 </textgroup>
+<textbox id="13" bbox="313.198,119.636,540.091,336.023" />
 </textgroup>
 </textgroup>
 </textgroup>