chore: refactor bazel test execution to a GitHub action

.github/actions/run_bazel_test/action.yaml

@@ -0,0 +1,14 @@
+name: Execute Bazel test
+description: Handles platform-specific settings.
+
+inputs:
+  working-directory:
+    type: string
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      env:
+        RBT_WORKING_DIR: ${{ inputs.working-directory }}
+      run: ${GITHUB_ACTION_PATH}/run_bazel_test.sh

.github/actions/run_bazel_test/run_bazel_test.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -o errexit -o nounset -o pipefail
+
+is_windows() {
+  local os_name
+  os_name="$( uname )"
+  # Examples: MINGW64_NT-10.0-17763
+  [[ "${os_name}" =~ ^MING ]]
+}
+
+working_dir="${RBT_WORKING_DIR:-}"
+
+if is_windows; then
+  export BAZEL_SH='C:\msys64\usr\bin\bash.exe'
+  bzl_pkgs='///...'
+else
+  bzl_pkgs='//...'
+fi
+
+if [[ -n "${working_dir:-}" ]]; then
+  cd "${working_dir}"
+fi
+
+bazel test "${bzl_pkgs}"

.github/workflows/workflow.yaml

@@ -46,7 +46,7 @@ jobs:
       - name: Disable stardoc
         # Windows: Stardoc complains about docstring quote indentation on Windows.
         # bzlmod: Stardoc does not work with bzlmod.
-        if: ${{ runner.os == 'Windows' || matrix.bazel_mode == 'module' }}
+        if: ${{ matrix.os == 'windows-2019' || matrix.bazel_mode == 'module' }}
         uses: tweag/write-bazelrc@v0
         with:
           content: build --config=no-stardoc
@@ -55,34 +55,17 @@ jobs:
         if: ${{ matrix.bazel_mode == 'module' }}
         with:
           content: build --experimental_enable_bzlmod
-      - name: Run tests (bzlmod)
-        if: matrix.bazel_mode == 'module'
-        working-directory: ./tests
-        run: |
-          echo "USE_BAZEL_VERSION=${{ matrix.version }}" > .bazeliskrc
-
-          if [[ ${{ runner.os }} == Windows ]]; then
-            # On Windows `//...` expands to `/...`.
-            BAZEL_SH='C:\msys64\usr\bin\bash.exe' bazel test  ///...
-          else
-            bazel test  //...
-          fi
-
-      - name: Run tests (workspace)
-        if: matrix.bazel_mode == 'workspace'
+      - name: Configure the Bazel version
         run: |
           echo "USE_BAZEL_VERSION=${{ matrix.version }}" > .bazeliskrc
           echo "USE_BAZEL_VERSION=${{ matrix.version }}" > tests/.bazeliskrc
-
-          if [[ ${{ runner.os }} == Windows ]]; then
-            # Because of the docstring quote issue on Windows we skip the stardoc test on the main workspace.
-            # On Windows `//...` expands to `/...`.
-            cd tests && BAZEL_SH='C:\msys64\usr\bin\bash.exe' bazel test ///...
-          else
-            bazel test //...
-
-            cd tests && bazel test //...
-          fi
+      - name: Run Bazel test at the root
+        if: ${{ matrix.bazel_mode == 'workspace' && matrix.os != 'windows-2019' }}
+        uses: ./.github/actions/run_bazel_test
+      - name: Run Bazel test under the tests directory
+        uses: ./.github/actions/run_bazel_test
+        with:
+          working-directory: tests
 
   all_ci_tests:
     runs-on: ubuntu-latest