Drop Python 3.3-specific tests

tests/test_amazon_ses_backend.py

@@ -4,7 +4,6 @@ from __future__ import unicode_literals
 import json
 from datetime import datetime
 from email.mime.application import MIMEApplication
-from unittest import skipIf
 
 import botocore.config
 import botocore.exceptions
@@ -18,9 +17,7 @@ from mock import ANY, patch
 from anymail.exceptions import AnymailAPIError, AnymailUnsupportedFeature
 from anymail.inbound import AnymailInboundMessage
 from anymail.message import attach_inline_image_file, AnymailMessage
-from .utils import (
-    AnymailTestMixin, SAMPLE_IMAGE_FILENAME, python_has_broken_mime_param_handling,
-    sample_image_content, sample_image_path)
+from .utils import AnymailTestMixin, SAMPLE_IMAGE_FILENAME, sample_image_content, sample_image_path
 
 
 @override_settings(EMAIL_BACKEND='anymail.backends.amazon_ses.EmailBackend')
@@ -152,9 +149,6 @@ class AmazonSESBackendStandardEmailTests(AmazonSESBackendMockAPITestCase):
         self.assertIn(b"\nCc: cc@xn--th-e0a.example.com\n", raw_mime)
         # SES doesn't support non-ASCII in the username@ part (RFC 6531 "SMTPUTF8" extension)
 
-    @skipIf(python_has_broken_mime_param_handling(),
-            "This Python has a buggy email package that crashes on non-ASCII "
-            "characters in RFC2231-encoded MIME header parameters")
     def test_attachments(self):
         text_content = "• Item one\n• Item two\n• Item three"  # those are \u2022 bullets ("\N{BULLET}")
         self.message.attach(filename="Une pièce jointe.txt",  # utf-8 chars in filename

tests/test_inbound.py

@@ -5,14 +5,13 @@ import quopri
 from base64 import b64encode
 from email.utils import collapse_rfc2231_value
 from textwrap import dedent
-from unittest import skipIf
 
 from django.core.mail import SafeMIMEText
 from django.test import SimpleTestCase
 
 from anymail.inbound import AnymailInboundMessage
 
-from .utils import SAMPLE_IMAGE_FILENAME, python_has_broken_mime_param_handling, sample_email_path, sample_image_content
+from .utils import SAMPLE_IMAGE_FILENAME, sample_email_path, sample_image_content
 
 SAMPLE_IMAGE_CONTENT = sample_image_content()
 
@@ -566,9 +565,6 @@ class EmailParserWorkaroundTests(SimpleTestCase):
         # Replace illegal encodings (rather than causing error):
         self.assertEqual(msg["X-Broken"], "Not a char: \N{REPLACEMENT CHARACTER}.")
 
-    @skipIf(python_has_broken_mime_param_handling(),
-            "This Python has a buggy email package that crashes on non-ASCII "
-            "characters in RFC2231-encoded MIME header parameters")
     def test_parse_encoded_params(self):
         raw = dedent("""\
             MIME-Version: 1.0

tests/utils.py

@@ -300,20 +300,3 @@ class ClientWithCsrfChecks(Client):
     def __init__(self, **defaults):
         super(ClientWithCsrfChecks, self).__init__(
             enforce_csrf_checks=True, **defaults)
-
-
-def python_has_broken_mime_param_handling():
-    # In Python 3.3 (only), trying to access any parsed MIME header will crash if the header
-    # has parameters with non-ASCII characters. (Common in, e.g., attachment filenames.)
-    # The bug is somewhere within email._header_value_parser.parse_mime_parameters, and is too
-    # complicated to work around for an uncommon version combination (Django 1.8 on Python 3.3).
-    # If you run into it, please upgrade to (at least) Python 3.4.
-    try:
-        from email.policy import default
-        default.header_fetch_parse("Content-Type", "plain; name*=iso-8859-1''Une%20pi%E8ce")
-    except ImportError:
-        return False  # Python 2 (or pre Python 3.3) -- bug doesn't apply
-    except UnicodeEncodeError:
-        return True  # this is the bug
-    else:
-        return False  # worked fine