update minimal parsel version, add deprecated classes for csstranslator modules, fix test

Author: eliasdorneles

requirements.txt

@@ -7,4 +7,4 @@ queuelib
 six>=1.5.2
 PyDispatcher>=2.0.5
 service_identity
-parsel>=0.9.0
+parsel>=0.9.1

scrapy/selector/csstranslator.py

@@ -1,6 +1,15 @@
-from parsel.csstranslator import (
-    ScrapyXPathExpr,
-    TranslatorMixin,
-    ScrapyGenericTranslator,
-    ScrapyHTMLTranslator
-)
+from parsel.csstranslator import XPathExpr, GenericTranslator, HTMLTranslator
+from scrapy.utils.deprecate import create_deprecated_class
+
+
+ScrapyXPathExpr = create_deprecated_class(
+    'ScrapyXPathExpr', XPathExpr,
+    new_class_path='parsel.csstranslator.XPathExpr')
+
+ScrapyGenericTranslator = create_deprecated_class(
+    'ScrapyGenericTranslator', GenericTranslator,
+    new_class_path='parsel.csstranslator.GenericTranslator')
+
+ScrapyHTMLTranslator = create_deprecated_class(
+    'ScrapyHTMLTranslator', HTMLTranslator,
+    new_class_path='parsel.csstranslator.HTMLTranslator')

setup.py

@@ -44,7 +44,7 @@
         'pyOpenSSL',
         'cssselect>=0.9',
         'six>=1.5.2',
-        'parsel>=0.9.0',
+        'parsel>=0.9.1',
         'PyDispatcher>=2.0.5',
         'service_identity',
     ],

tests/test_selector.py

@@ -43,7 +43,7 @@ def test_simple_selection(self):
     def test_deprecated_root_argument(self, warnings):
         root = etree.fromstring(u'<html/>')
         sel = self.sscls(_root=root)
-        self.assertEqual(root, sel._root)
+        self.assertIs(root, sel._root)
         warnings.warn.assert_called_once_with(
             'Argument `_root` is deprecated, use `root` instead',
             mock.ANY, stacklevel=2)