diff --git a/wsme/protocols/restxml.py b/wsme/protocols/restxml.py
index 29bdb81..88b0b6a 100644
--- a/wsme/protocols/restxml.py
+++ b/wsme/protocols/restxml.py
@@ -3,10 +3,7 @@ import datetime
 from six import u
 import six
 
-try:
-    import xml.etree.ElementTree as et
-except ImportError:
-    import cElementTree as et
+import xml.etree.ElementTree as et
 
 from simplegeneric import generic
 
diff --git a/wsme/root.py b/wsme/root.py
index 4b98d98..100b7ba 100644
--- a/wsme/root.py
+++ b/wsme/root.py
@@ -28,6 +28,23 @@ html_body = u("""
 """)
 
 
+def default_prepare_response_body(request, results):
+    r = None
+    sep = None
+    for value in results:
+        if sep is None:
+            if isinstance(value, six.text_type):
+                sep = u('\n')
+                r = u('')
+            else:
+                sep = b('\n')
+                r = b('')
+        else:
+            r += sep
+        r += value
+    return r
+
+
 class DummyTransaction:
     def commit(self):
         pass
@@ -166,22 +183,6 @@ class WSRoot(object):
             return protocol.encode_error(context, infos)
 
     def _handle_request(self, request):
-        def default_prepare_response_body(request, results):
-            r = None
-            sep = None
-            for value in results:
-                if sep is None:
-                    if isinstance(value, six.text_type):
-                        sep = u('\n')
-                        r = u('')
-                    else:
-                        sep = b('\n')
-                        r = b('')
-                else:
-                    r += sep
-                r += value
-            return r
-
         res = webob.Response()
         res_content_type = None
 
diff --git a/wsme/tests/test_restxml.py b/wsme/tests/test_restxml.py
index 4b3a976..b30f2bd 100644
--- a/wsme/tests/test_restxml.py
+++ b/wsme/tests/test_restxml.py
@@ -149,6 +149,17 @@ class TestRestXML(wsme.tests.protocol.ProtocolTestCase):
   <atext>test</atext>
 </value>""")
 
+    def test_encode_sample_params(self):
+        lang, content = self.root.protocols[0].encode_sample_params(
+            [('a', int, 2)], True)
+        assert lang == 'xml', lang
+        assert content == b('<parameters>\n  <a>2</a>\n</parameters>'), content
+
+    def test_encode_sample_result(self):
+        lang, content = self.root.protocols[0].encode_sample_result(int, 2, True)
+        assert lang == 'xml', lang
+        assert content == b('<result>2</result>'), content
+
     def test_nil_fromxml(self):
         for dt in (
                 str, [int], {int: str}, bool,
@@ -158,6 +169,7 @@ class TestRestXML(wsme.tests.protocol.ProtocolTestCase):
 
     def test_nil_toxml(self):
         for dt in (
+                wsme.types.bytes,
                 [int], {int: str}, bool,
                 datetime.date, datetime.time, datetime.datetime):
             x = et.tostring(toxml(dt, 'value', None))
diff --git a/wsme/tests/test_root.py b/wsme/tests/test_root.py
index 9c3e8b4..da53780 100644
--- a/wsme/tests/test_root.py
+++ b/wsme/tests/test_root.py
@@ -3,6 +3,9 @@
 import unittest
 
 from wsme import WSRoot
+from wsme.root import default_prepare_response_body
+
+from six import b, u
 
 
 class TestRoot(unittest.TestCase):
@@ -13,3 +16,26 @@ class TestRoot(unittest.TestCase):
 
         txn = root.begin()
         txn.abort()
+
+    def test_default_prepare_response_body(self):
+        default_prepare_response_body(None, [b('a')]) == b('a')
+        default_prepare_response_body(None, [b('a'), b('b')]) == b('a\nb')
+        default_prepare_response_body(None, [u('a')]) == u('a')
+        default_prepare_response_body(None, [u('a'), u('b')]) == u('a\nb')
+
+    def test_protocol_selection_error(self):
+        import wsme.protocols
+
+        class P(wsme.protocols.Protocol):
+            def accept(self, r):
+                raise Exception('test')
+
+        root = WSRoot()
+        root.addprotocol(P())
+
+        from webob import Request
+        req = Request.blank('/test?check=a&check=b&name=Bob')
+        res = root._handle_request(req)
+        assert res.status_int == 500
+        assert res.content_type == 'text/plain'
+        assert res.text == u('Error while selecting protocol: test'), req.text