Test macOS with GitHub Actions

.github/workflows/macos-install.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+
+sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
+
+brew install libtiff libjpeg webp little-cms2
+
+PYTHONOPTIMIZE=0 pip install cffi
+pip install coverage
+pip install olefile
+pip install -U pytest
+pip install -U pytest-cov
+pip install pyroma
+pip install test-image-results
+pip install numpy
+
+# extra test images
+pushd depends && ./install_extra_test_images.sh && popd

.github/workflows/test.yml

@@ -5,9 +5,12 @@ on: [push, pull_request]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
     strategy:
       matrix:
+        os: [
+          "ubuntu-18.04",
+          "macOS-10.14",
+        ]
         python-version: [
           "pypy3",
           "pypy2",
@@ -21,7 +24,8 @@ jobs:
           env: PYTHONOPTIMIZE=2
         - python-version: "3.6"
           env: PYTHONOPTIMIZE=1
-    name: Python ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.os }} Python ${{ matrix.python-version }}
 
     steps:
     - uses: actions/checkout@v1
@@ -31,10 +35,16 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: Install dependencies
+    - name: Install Linux dependencies
+      if: matrix.os == 'ubuntu-18.04'
       run: |
         .travis/install.sh
 
+    - name: Install macOS dependencies
+      if: matrix.os == 'macOS-10.14'
+      run: |
+        .github/workflows/macos-install.sh
+
     - name: Test
       run: |
         .travis/script.sh