[tests] Add macOS to github test matrix

Bug: T110925
Change-Id: Ic77f1a8a7178b1aa7b00f35a48ce36b84a9ad48a
---
M .github/workflows/pywikibot-ci.yml
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/pywikibot-ci.yml b/.github/workflows/pywikibot-ci.yml
index 8c6d951..f536b54 100644
--- a/.github/workflows/pywikibot-ci.yml
+++ b/.github/workflows/pywikibot-ci.yml
@@ -15,7 +15,7 @@
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
     continue-on-error: ${{ matrix.experimental || false }}
 
     strategy:
@@ -41,6 +41,9 @@
           - python-version: "3.11.0-alpha.2"
             site: "wikipedia:test"
             experimental: true
+          - python-version: 3
+            site: "wikipedia:de"
+            os: macOS-latest
 
     steps:
     - uses: actions/checkout@v2

