ci: test winit-core

.github/workflows/ci.yml

@@ -179,6 +179,9 @@ jobs:
     - name: Build crate
       run: cargo $CMD build $OPTIONS
 
+    - name: Test winit core
+      run: cargo test -p winit-core
+
     # Test only on Linux x86_64, so we avoid spending unnecessary CI hours.
     - name: Test dpi crate
       if: >