Used assertRaisesMessage() in {% for %} tests.

tests/template_tests/syntax_tests/test_for.py

@@ -71,17 +71,20 @@ class ForTagTests(SimpleTestCase):
 
     @setup({'for-tag-unpack06': '{% for key value in items %}{{ key }}:{{ value }}/{% endfor %}'})
     def test_for_tag_unpack06(self):
-        with self.assertRaises(TemplateSyntaxError):
+        msg = "'for' tag received an invalid argument: for key value in items"
+        with self.assertRaisesMessage(TemplateSyntaxError, msg):
             self.engine.render_to_string('for-tag-unpack06', {'items': (('one', 1), ('two', 2))})
 
     @setup({'for-tag-unpack07': '{% for key,,value in items %}{{ key }}:{{ value }}/{% endfor %}'})
     def test_for_tag_unpack07(self):
-        with self.assertRaises(TemplateSyntaxError):
+        msg = "'for' tag received an invalid argument: for key,,value in items"
+        with self.assertRaisesMessage(TemplateSyntaxError, msg):
             self.engine.render_to_string('for-tag-unpack07', {'items': (('one', 1), ('two', 2))})
 
     @setup({'for-tag-unpack08': '{% for key,value, in items %}{{ key }}:{{ value }}/{% endfor %}'})
     def test_for_tag_unpack08(self):
-        with self.assertRaises(TemplateSyntaxError):
+        msg = "'for' tag received an invalid argument: for key,value, in items"
+        with self.assertRaisesMessage(TemplateSyntaxError, msg):
             self.engine.render_to_string('for-tag-unpack08', {'items': (('one', 1), ('two', 2))})
 
     @setup({'for-tag-unpack09': '{% for val in items %}{{ val.0 }}:{{ val.1 }}/{% endfor %}'})