Run tests on macOS

.github/workflows/tests.yaml

@@ -6,21 +6,20 @@ on:
 jobs:
   tests:
     name: Run the tests
-    runs-on: ubuntu-20.04
+    runs-on: macos-10.15
 
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
       - name: Install tools
         run: |
-          sudo apt-get install dc ffmpeg gifsicle
-          sudo npm install -g bats
+          brew install bats-core ffmpeg gifsicle youtube-dl
 
       - name: Setup python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Configure pip caching
         uses: actions/cache@v1
@@ -32,10 +31,9 @@ jobs:
 
       - name: Install dependencies
         run: |
-          sudo apt-get install libfreetype-dev python3-pil
+          # sudo apt-get install libfreetype-dev python3-pil
           python -m pip install --upgrade pip
           pip install -r requirements.txt
-          pip install youtube-dl
 
       - name: Download sample video
         run: |