Make it possible to use certain python versions according to the file name of a normalizer issue file.

conftest.py

@@ -1,3 +1,4 @@
+import re
 import tempfile
 import shutil
 import logging
@@ -36,12 +37,12 @@ def pytest_addoption(parser):
 
 
 def pytest_generate_tests(metafunc):
-    if 'normalizer_issue_file' in metafunc.fixturenames:
+    if 'normalizer_issue_case' in metafunc.fixturenames:
         base_dir = os.path.join(os.path.dirname(__file__), 'test', 'normalizer_issue_files')
 
         cases = list(colllect_normalizer_tests(base_dir))
         metafunc.parametrize(
-            'normalizer_issue_file',
+            'normalizer_issue_case',
             cases,
             ids=[c.name for c in cases]
         )
@@ -55,6 +56,8 @@ class NormalizerIssueCase(object):
     def __init__(self, path):
         self.path = path
         self.name = os.path.basename(path)
+        match = re.search(r'python([\d.]+)\.py', self.name)
+        self.python_version = match and match.group(1)
 
 
 def colllect_normalizer_tests(base_dir):

test/test_normalizer_issues_files.py

@@ -47,18 +47,19 @@ def collect_errors(code):
                 yield WantedIssue(code[1:], l, column)
 
 
-def test_normalizer_issue(normalizer_issue_file):
+def test_normalizer_issue(normalizer_issue_case):
     def sort(issues):
         issues = sorted(issues, key=lambda i: (i.start_pos, i.code))
         return ["(%s, %s): %s" % (i.start_pos[0], i.start_pos[1], i.code)
                 for i in issues]
 
-    with open(normalizer_issue_file.path, 'rb') as f:
+    with open(normalizer_issue_case.path, 'rb') as f:
         code = source_to_unicode(f.read())
 
     desired = sort(collect_errors(code))
 
-    module = parso.parse(code)
+    grammar = parso.load_grammar(version=normalizer_issue_case.python_version)
+    module = grammar.parse(code)
     issues = module._get_normalizer_issues()
     actual = sort(issues)