Improve testing (#415)

These changes:

 - Fix the lint and the djmaster jobs
 - Fix compatibility with upcoming Django 3.0
 - Replace jobs with matrix in .travis.yml
 - Add a test job for Python 3.8
 - Allow running tests on any branch

.travis.yml

@@ -4,12 +4,13 @@ python:
   - '3.5'
   - '3.6'
   - '3.7'
+  - '3.8-dev'
 
 dist: xenial
 
 cache: pip
 
-jobs:
+matrix:
   include:
     - python: '3.6'
       env: TOXENV=docs
@@ -38,6 +39,7 @@ jobs:
   allow_failures:
     - env: TOXENV=lint
     - env: TOXENV=djmaster
+    - python: '3.8-dev'
 
   fast_finish: true
 
@@ -59,11 +61,6 @@ after_success:
       codecov
     fi
 
-branches:
-  only:
-    - master
-    - /^v?\d+\.\d+(\.\d+)?(-?\S+)?$/
-
 stages:
   - test
   - name: publish

requirements/testproj.txt

@@ -1,6 +1,5 @@
 # test project requirements
 Pillow>=4.3.0
-django-cors-headers>=2.1.0
 django-filter>=1.1.0,<2.0; python_version == "2.7"
 django-filter>=1.1.0; python_version >= "3.5"
 #djangorestframework-camel-case>=0.2.0
@@ -9,5 +8,3 @@ django-filter>=1.1.0; python_version >= "3.5"
 djangorestframework-recursive>=0.1.2
 dj-database-url>=0.4.2
 user_agents>=1.1.0
-# django-oauth-toolkit 1.2 does not support Django 1.11
-django-oauth-toolkit>=1.1.0,<1.2.0

src/drf_yasg/inspectors/__init__.py

@@ -5,7 +5,7 @@
 from .field import (
     CamelCaseJSONFilter, ChoiceFieldInspector, DictFieldInspector, FileFieldInspector, HiddenFieldInspector,
     InlineSerializerInspector, JSONFieldInspector, RecursiveFieldInspector, ReferencingSerializerInspector,
-     RelatedFieldInspector, SerializerMethodFieldInspector, SimpleFieldInspector, StringDefaultFieldInspector
+    RelatedFieldInspector, SerializerMethodFieldInspector, SimpleFieldInspector, StringDefaultFieldInspector
 )
 from .query import CoreAPICompatInspector, DjangoRestResponsePagination
 from .view import SwaggerAutoSchema

src/drf_yasg/renderers.py

@@ -2,7 +2,7 @@
 
 from django.shortcuts import resolve_url
 from django.template.loader import render_to_string
-from django.utils.encoding import force_text
+from django.utils.encoding import force_str
 from django.utils.functional import Promise
 from rest_framework.renderers import BaseRenderer, JSONRenderer, TemplateHTMLRenderer
 from rest_framework.utils import encoders, json
@@ -124,7 +124,7 @@ def set_context(self, renderer_context, swagger=None):
         swagger_ui_settings = self.get_swagger_ui_settings()
 
         request = renderer_context.get('request', None)
-        oauth_redirect_url = force_text(swagger_ui_settings.get('oauth2RedirectUrl', ''))
+        oauth_redirect_url = force_str(swagger_ui_settings.get('oauth2RedirectUrl', ''))
         if request and oauth_redirect_url:
             swagger_ui_settings['oauth2RedirectUrl'] = request.build_absolute_uri(oauth_redirect_url)
 

src/drf_yasg/utils.py

@@ -5,7 +5,7 @@
 from decimal import Decimal
 
 from django.db import models
-from django.utils.encoding import force_text
+from django.utils.encoding import force_str
 from rest_framework import serializers, status
 from rest_framework.mixins import DestroyModelMixin, ListModelMixin, RetrieveModelMixin, UpdateModelMixin
 from rest_framework.parsers import FileUploadParser
@@ -434,7 +434,7 @@ def force_real_str(s, encoding='utf-8', strings_only=False, errors='strict'):
     Fix for https://github.com/axnsan12/drf-yasg/issues/159
     """
     if s is not None:
-        s = force_text(s, encoding, strings_only, errors)
+        s = force_str(s, encoding, strings_only, errors)
         if type(s) != str:
             s = '' + s
 

src/drf_yasg/views.py

@@ -1,8 +1,7 @@
 import warnings
-from functools import wraps
+from functools import WRAPPER_ASSIGNMENTS, wraps
 
 from django.utils.cache import add_never_cache_headers
-from django.utils.decorators import available_attrs
 from django.views.decorators.cache import cache_page
 from django.views.decorators.vary import vary_on_headers
 from rest_framework import exceptions
@@ -30,7 +29,7 @@ def deferred_never_cache(view_func):
     never be cached.
     """
 
-    @wraps(view_func, assigned=available_attrs(view_func))
+    @wraps(view_func, assigned=WRAPPER_ASSIGNMENTS)
     def _wrapped_view_func(request, *args, **kwargs):
         response = view_func(request, *args, **kwargs)
 

testproj/snippets/serializers.py

@@ -13,7 +13,6 @@
     from django.core.validators import MaxLengthValidator, MinValueValidator
 
 
-
 class LanguageSerializer(serializers.Serializer):
     name = serializers.ChoiceField(
         choices=LANGUAGE_CHOICES, default='python', help_text='The name of the programming language')

tox.ini

@@ -8,9 +8,10 @@ envlist =
     py27-django111-drf39-typing,
     py27-django111-drf{38,39},
     py{35,36}-django{111,21,22}-drf{38,39},
-    py37-django{21,22}-drf{38,39},
-    py37-django{21,22}-drf310,
+    py37-django{21,22}-drf{38,39,310},
+    py38-django22-drf310,
     djmaster, lint, docs
+skip_missing_interpreters = true
 
 [testenv:.package]
 # no additional dependencies besides PEP 517
@@ -19,18 +20,30 @@ deps =
 [testenv]
 deps =
     django111: Django>=1.11,<2.0
+    django111: django-cors-headers>=2.1.0
+    django111: django-oauth-toolkit>=1.1.0,<1.2.0
+
     django21: Django>=2.1,<2.2
+    django21: django-cors-headers>=2.1.0
+    django21: django-oauth-toolkit>=1.2.0
+
     django22: Django>=2.2,<2.3
+    django22: django-cors-headers>=2.1.0
+    django22: django-oauth-toolkit>=1.2.0
+
 
     drf38: djangorestframework>=3.8,<3.9
     drf39: djangorestframework>=3.9,<3.10
     drf310: djangorestframework>=3.10
 
     typing: typing>=3.6.6
 
-    # test with the latest build of django-rest-framework to get early warning of compatibility issues
-    djmaster: https://github.com/encode/django-rest-framework/archive/master.tar.gz
+    # test with the latest builds of Django and django-rest-framework
+    # to get early warning of compatibility issues
     djmaster: https://github.com/django/django/archive/master.tar.gz
+    djmaster: https://github.com/ottoyiu/django-cors-headers/archive/master.tar.gz
+    djmaster: https://github.com/encode/django-rest-framework/archive/master.tar.gz
+    djmaster: django-oauth-toolkit>=1.2.0
 
     # other dependencies
     -r requirements/validation.txt
@@ -77,5 +90,5 @@ known_standard_library =
 known_third_party =
     coreapi,coreschema,datadiff,dj_database_url,django,django_filters,djangorestframework_camel_case,
     rest_framework_recursive,flex,gunicorn,inflection,pytest,rest_framework,ruamel,setuptools_scm,
-    swagger_spec_validator,uritemplate,user_agents,whitenoise,oauth2_provider
+    swagger_spec_validator,uritemplate,user_agents,whitenoise,oauth2_provider,packaging
 known_first_party = drf_yasg,testproj,articles,people,snippets,todo,users,urlconfs