Try a macOS test on github

.github/workflows/tests.yml

@@ -2,9 +2,10 @@ name: run-tox
 on: [push, pull_request]
 jobs:
   unit-tests:
-    runs-on: ubuntu-16.04
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: [ubuntu-16.04, macos-10.15]
         python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
 
     steps:
@@ -16,10 +17,10 @@ jobs:
       - name: Install requirements
         run: |
           sed -i -e 's/^/#/' tests/gnupghome/gpg-agent.conf
-          ./install_dependencies.linux.sh
+          [ $(uname) = "Darwin"] && ./install_dependencies.osx.sh || ./install_dependencies.linux.sh
           pip install tox
       - name: Run Tox
-        run: tox -e py
+        run: ./tox.sh -e py
 
   test-setup:
     runs-on: ubuntu-16.04

install_dependencies.osx.sh

@@ -1,22 +1,4 @@
 #!/bin/bash
-# mapping to get from the TRAVIS_PYTHON_VERSION environment variable to something pyenv understands
-# this will need to be manually kept up to date until travis support for python on osx improves
-declare -A pyver
-pyver["2.7"]="2.7.13"
-pyver["3.4"]="3.4.6"
-pyver["3.5"]="3.5.3"
-pyver["3.6"]="3.6.0"
-pyver["3.7"]="3.7.0"
-pyver["pypy"]="pypy2-5.6.0"
-pyver["pypy3"]="pypy3.3-5.5-alpha"
 
-sudo brew update
-# travis doesn't natively support python on osx yet, so start by installing pyenv
-# also install newer openssl here
-sudo brew install -y pyenv openssl
-# now install the requested version of python, and set it to local
-pyenv install ${pyver[${TRAVIS_PYTHON_VERSION}]}
-pyenv local ${pyver[${TRAVIS_PYTHON_VERSION}]}
-
-# make sure libffi-dev, gnupg2, pgpdump, and newer openssl are installed as well
-sudo brew install -y libffi-dev gnupg2 pgpdump
+brew update
+brew install -y libffi-dev gnupg2 pgpdump openssl@1.1

tox.sh

@@ -1,10 +1,10 @@
 #!/bin/bash
 
 # homebrew is installed and so is a brewed openssl
-if [[ $(uname) == "Darwin" ]] && command -v brew &>/dev/null && brew list openssl &>/dev/null; then
+if [[ $(uname) == "Darwin" ]] && command -v brew &>/dev/null && brew list openssl@1.1 &>/dev/null; then
     export ARCHFLAGS="-arch x86_64"
-    export LDFLAGS="-L/usr/local/opt/openssl/lib"
-    export CFLAGS="-I/usr/local/opt/openssl/include"
+    export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib"
+    export CFLAGS="-I/usr/local/opt/openssl@1.1/include"
 fi
 
 exec tox $*