Escape back slashes in tests to avoid DeprecationWarning.

Author: domdfcoding

tests/test_jsonpath_rw_ext.py

@@ -126,14 +126,14 @@ class Testjsonpath_ng_ext(testscenarios.WithScenarios,
                                                  {'cat': 2, 'cow': 1},
                                                  {'cat': 3, 'cow': 3}]},
                                target=2)),
-        ('sort2', dict(string='objects[\cat]',
+        ('sort2', dict(string='objects[\\cat]',
                        data={'objects': [{'cat': 2}, {'cat': 1}, {'cat': 3}]},
                        target=[[{'cat': 3}, {'cat': 2}, {'cat': 1}]])),
-        ('sort2_indexed', dict(string='objects[\cat][-1].cat',
+        ('sort2_indexed', dict(string='objects[\\cat][-1].cat',
                                data={'objects': [{'cat': 2}, {'cat': 1},
                                                  {'cat': 3}]},
                                target=1)),
-        ('sort3', dict(string='objects[/cow,\cat]',
+        ('sort3', dict(string='objects[/cow,\\cat]',
                        data={'objects': [{'cat': 1, 'cow': 2},
                                          {'cat': 2, 'cow': 1},
                                          {'cat': 3, 'cow': 1},
@@ -142,7 +142,7 @@ class Testjsonpath_ng_ext(testscenarios.WithScenarios,
                                {'cat': 2, 'cow': 1},
                                {'cat': 1, 'cow': 2},
                                {'cat': 3, 'cow': 3}]])),
-        ('sort3_indexed', dict(string='objects[/cow,\cat][0].cat',
+        ('sort3_indexed', dict(string='objects[/cow,\\cat][0].cat',
                                data={'objects': [{'cat': 1, 'cow': 2},
                                                  {'cat': 2, 'cow': 1},
                                                  {'cat': 3, 'cow': 1},