Workflow to test working-directory action input

.github/workflows/test-working-directory.yml

@@ -0,0 +1,137 @@
+---
+name: Test working-directory input
+
+on: push  # yamllint disable-line rule:truthy
+
+jobs:
+  test-working-directory:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up test environment
+        run: |
+          pip install pip-requirements-parser
+          mkdir -p $RUNNER_TEMP/test-repo
+          pushd $RUNNER_TEMP/test-repo
+          git init
+          git config user.email "test@example.com"
+          git config user.name "Test User"
+          git commit --allow-empty -m "Initial empty commit"
+          echo 'def hello(): return "Hello, World!"' > test.py
+          git add test.py
+          git commit -m "Add test.py file"
+          echo 'def  hello():    return  "Hello, World!"' > test.py
+          popd
+
+      - name: "Run Darker without working-directory"
+        uses: ./
+        continue-on-error: true
+        id: no-work-dir
+        with:
+          version: "@gh-action-working-directory"
+          options: --check --diff
+          src: test.py
+          revision: HEAD
+
+      - name: Fail if no exit code 2 even though test.py was not found
+        if: steps.no-work-dir.outputs.exitcode != '2'
+        run: |
+          echo "::error::Darker should have failed with exit code 2"
+          echo "::error::It exited with ${{ steps.no-work-dir.outputs.exitcode }}"
+          exit 1
+
+      - name: "Run Darker with correct working-directory"
+        id: right-workdir
+        if: always()
+        uses: ./
+        continue-on-error: true
+        with:
+          version: "@gh-action-working-directory"
+          options: --check --diff
+          working-directory: ${{ runner.temp }}/test-repo
+          src: test.py
+          revision: HEAD
+
+      - name: Fail if no exit code 1 even though reformatting is needed
+        if: steps.right-workdir.outputs.exitcode != '1'
+        run: |
+          echo "::error::Darker should have exited with code 1"
+          echo "::error::It exited with ${{ steps.right-workdir.outputs.exitcode }}"
+          exit 1
+
+      - name: Verify diff output
+        if: ( ! contains(steps.right-workdir.outputs.stdout, '@@') )
+        run: |
+          echo "::error::Darker did not output a diff as expected"
+          exit 1
+
+      - name: "Run Darker with incorrect working-directory"
+        if: always()
+        uses: ./
+        continue-on-error: true
+        id: wrong-work-dir
+        with:
+          version: "@gh-action-working-directory"
+          options: --check --diff
+          working-directory: ${{ runner.temp }}/non-existent-dir
+          src: test.py
+          revision: HEAD
+
+      - name: Check that Darker failed with a non-existing working-directory
+        if: steps.wrong-work-dir.outputs.exitcode != '21'
+        run: |
+          echo "::error::Darker should have exited with code 21"
+          echo "::error::It exited with ${{ steps.wrong-work-dir.outputs.exitcode }}"
+          exit 1
+
+      - name: "Run Darker on a non-existing file"
+        id: file-not-found
+        if: always()
+        uses: ./
+        continue-on-error: true
+        with:
+          version: "@gh-action-working-directory"
+          options: --check --diff
+          working-directory: ${{ runner.temp }}/test-repo
+          src: non_existent_file.py
+
+      - name: Check file not found error code
+        if: steps.file-not-found.outputs.exitcode != '2'
+        run: |
+          echo "::error::Darker should have exited with code 2"
+          echo "::error::It exited with ${{ steps.file-not-found.outputs.exitcode }}"
+          exit 1
+
+      - name: "Run Darker with an invalid argument"
+        id: invalid-arguments
+        if: always()
+        uses: ./
+        continue-on-error: true
+        with:
+          version: "@gh-action-working-directory"
+          options: --invalid-option
+
+      - name: Check invalid arguments error code
+        if: steps.invalid-arguments.outputs.exitcode != '3'
+        run: |
+          echo "::error::Darker should have exited with code 3"
+          echo "::error::It exited with ${{ steps.invalid-arguments.outputs.exitcode }}"
+          exit 1
+
+      - name: "Run Darker with a missing dependency"
+        id: missing-deps
+        if: always()
+        uses: ./
+        continue-on-error: true
+        with:
+          version: "@gh-action-working-directory"
+          working-directory: ${{ runner.temp }}/test-repo
+          options: --flynt
+
+      - name: Check missing dependencies error code
+        if: steps.missing-deps.outputs.exitcode != '4'
+        run: |
+          echo "::error::Darker should have exited with code 4"
+          echo "::error::It exited with ${{ steps.missing-deps.outputs.exitcode }}"
+          exit 1