tests: install coreutils on mac os

Author: oliver-sanders

.github/workflows/test.yml

@@ -24,6 +24,25 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
+      - name: Brew Install
+        if: startsWith(matrix.os, 'macos')
+        run: |
+          # install system deps
+          brew update
+          brew install bash coreutils
+
+          # add GNU coreutils to the user PATH
+          # (see instructions in brew install output)
+          echo \
+            "$(brew --prefix)/opt/coreutils/libexec/gnubin" \
+            >> "${GITHUB_PATH}"
+
+          # add coreutils to the bashrc too (for jobs)
+          cat >> "${HOME}/.bashrc" <<__HERE__
+          PATH="$(brew --prefix)/opt/coreutils/libexec/gnubin:$PATH"
+          export PATH
+          __HERE__
+
       - name: Setup Python
         uses: actions/setup-python@v3
         with: