[ci] try running tests in nix-shell

.github/workflows/test.yml

@@ -26,5 +26,12 @@ jobs:
       - uses: cachix/install-nix-action@v25
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
-      - run: nix build
-      - run: nix flake check
+          nix_path: nixpkgs=channel:nixos-unstable
+      - run: |
+          git config --global init.defaultBranch master
+          git config --global user.name  scm_breeze@scm_breeze
+          git config --global user.email "SCM Breeze"
+      - run: nix-shell -p bash zsh --run ./run_tests.sh
+      # - run: nix-shell -p shunit2 -i ./run_tests.sh
+      # - run: nix build
+      # - run: nix flake check

run_tests.sh

@@ -15,6 +15,7 @@ for test in $(find test/lib -name *_test.sh); do
   for shell in $TEST_SHELLS; do
     echo "== Running tests with [$shell]: $test"
     $shell $test || failed=true
+    printf '==\n\n'
   done
 done