Fix unicode problem on template test

Since strings are already unicode by default in p3, unicode_escape was
causing double decoding. Also a broken test was preventing to discover
this fix

src/underscore.py

@@ -1440,14 +1440,14 @@ def interpolate(matchobj):
             if getattr(str, 'decode', False):
                 key = (matchobj.group(1).decode('string-escape')).strip()
             else:
-                key = (bytes(matchobj.group(1), "utf-8").decode('unicode_escape')).strip()
+                key = (bytes(matchobj.group(1), "utf-8").decode()).strip()
             return "' + str(" + unescape(key) + " or '') + '"
 
         def evaluate(matchobj):
             if getattr(str, 'decode', False):
                 code = (matchobj.group(1).decode('string-escape')).strip()
             else:
-                code = (bytes(matchobj.group(1), "utf-8").decode('unicode_escape')).strip()
+                code = (bytes(matchobj.group(1), "utf-8").decode()).strip()
             if code.startswith("end"):
                 return "')\n" + indent(-1) + "ns.__p += ('"
             elif code.endswith(':'):
@@ -1461,7 +1461,7 @@ def escape(matchobj):
             if getattr(str, 'decode', False):
                 key = (matchobj.group(1).decode('string-escape')).strip()
             else:
-                key = (bytes(matchobj.group(1), "utf-8").decode('unicode_escape')).strip()
+                key = (bytes(matchobj.group(1), "utf-8").decode()).strip()
             return "' + _.escape(str(" + unescape(key) + " or '')) + '"
 
         source = indent() + 'class closure(object):\n    pass' + \
@@ -1478,7 +1478,7 @@ def escape(matchobj):
         if getattr(str, 'decode', False):
             source += indent() + 'return ns.__p.decode("string_escape")\n'
         else:
-            source += indent() + 'return bytes(ns.__p, "utf-8").decode("unicode_escape")\n'
+            source += indent() + 'return bytes(ns.__p, "utf-8").decode()\n'
 
         f = self.create_function(settings.get("variable")
                                  or "obj=None", source)

tests/test_utility.py

@@ -69,7 +69,7 @@ def test_template(self):
         sansSemicolonTemplate = _.template("A <% this %> B")
         self.assertEqual(sansSemicolonTemplate(), "A  B")
 
-        backslashTemplate = _.template("<%= thing %> is \\ridanculous")
+        backslashTemplate = _.template("<%= thing %> is \ridanculous")
         self.assertEqual(backslashTemplate({"thing": 'This'}), "This is \ridanculous")
 
         escapeTemplate = _.template('<%= "checked=\\"checked\\"" if a else "" %>')