Confirmed compatibility with Python 3.9. (carltongibson#1270)

* Run tests against Python 3.9
* Don't let GitHub Actions cancel once the first job fails
* [tests] Force mocked QuerySet's to be truthy

Co-authored-by: Carlton Gibson <carlton@noumenal.es>

.github/workflows/tests.yml

@@ -6,8 +6,9 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9.0-rc - 3.9]
 
     steps:
       - uses: actions/checkout@v2

README.rst

@@ -21,7 +21,7 @@ Full documentation on `read the docs`_.
 Requirements
 ------------
 
-* **Python**: 3.5, 3.6, 3.7, 3.8
+* **Python**: 3.5, 3.6, 3.7, 3.8, 3.9
 * **Django**: 2.2, 3.0, 3.1
 * **DRF**: 3.10+
 

setup.py

@@ -52,6 +52,7 @@
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Framework :: Django',
     ],
     zip_safe=False,

tests/utils.py

@@ -3,13 +3,19 @@
 from django.db import models
 
 
+class QuerySet(models.QuerySet):
+
+    def __bool__(self):
+        return True
+
+
 class MockQuerySet:
     """
     Generate a mock that is suitably similar to a QuerySet
     """
 
     def __new__(self):
-        m = mock.Mock(spec_set=models.QuerySet())
+        m = mock.Mock(spec_set=QuerySet())
         m.filter.return_value = m
         m.all.return_value = m
         return m

tox.ini

@@ -2,8 +2,8 @@
 envlist =
        {py35,py36,py37}-django22,
        {py36,py37,py38}-django30,
-       {py36,py37,py38}-django31,
-       {py36,py37,py38}-latest,
+       {py36,py37,py38,py39}-django31,
+       {py36,py37,py38,py39}-latest,
        isort,lint,docs,warnings,