[Checkins] SVN: zope.tales/trunk/src/zope/tales/tests/test_expressions.py document behaviour and failure modes reported in https://bugs.launchpad.net/zope2/+bug/246983

[Leonardo Rochael Almeida]

Log message for revision 107480:
  document behaviour and failure modes reported in https://bugs.launchpad.net/zope2/+bug/246983

Changed:
  U   zope.tales/trunk/src/zope/tales/tests/test_expressions.py

-=-
Modified: zope.tales/trunk/src/zope/tales/tests/test_expressions.py
===================================================================
--- zope.tales/trunk/src/zope/tales/tests/test_expressions.py	2009-12-31 21:41:57 UTC (rev 107479)
+++ zope.tales/trunk/src/zope/tales/tests/test_expressions.py	2009-12-31 22:15:05 UTC (rev 107480)
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 ##############################################################################
 #
 # Copyright (c) 2001, 2002 Zope Corporation and Contributors.
@@ -66,6 +67,7 @@
               B = 2,
               adapterTest = at,
               dynamic = 'z',
+              eightBits = 'déjà vu',
               ErrorGenerator = ErrorGenerator(),
               )
             )
@@ -125,7 +127,9 @@
     def testString(self):
         expr = self.engine.compile('string:Fred')
         context=self.context
-        self.assertEqual(expr(context), 'Fred')
+        result = expr(context)
+        self.assertEqual(result, 'Fred')
+        self.failUnless(isinstance(result, str))
 
     def testStringSub(self):
         expr = self.engine.compile('string:A$B')
@@ -136,7 +140,27 @@
         expr = self.engine.compile('string:a ${x/y} b ${y/z} c')
         context=self.context
         self.assertEqual(expr(context), 'a yikes b 3 c')
+    
+    def testString8Bits(self):
+        # Simple eight bit string interpolation should just work. 
+        expr = self.engine.compile('string:a ${eightBits}')
+        context=self.context
+        self.assertEqual(expr(context), 'a déjà vu')
 
+    def testStringUnicode(self):
+        # Unicode string expressions should return unicode strings
+        expr = self.engine.compile(u'string:Fred')
+        context=self.context
+        result = expr(context)
+        self.assertEqual(result, u'Fred')
+        self.failUnless(isinstance(result, unicode))
+
+    def testStringFailureWhenMixed(self):
+        # Mixed Unicode and 8bit string interpolation fails with a
+        # UnicodeDecodeError, assuming there is no default encoding
+        expr = self.engine.compile(u'string:a ${eightBits}')
+        self.assertRaises(UnicodeDecodeError, expr, self.context)
+
     def testPython(self):
         expr = self.engine.compile('python: 2 + 2')
         context=self.context