Add parallel testing demo

Author: chingc

.github/workflows/parallel.yml

@@ -11,7 +11,7 @@ jobs:
     name: Collect
     runs-on: ubuntu-latest
     outputs:
-      TEST_MATRIX: "${{ steps.matrix.outputs.TEST_MATRIX }}"
+      TEST_DIRS: "${{ steps.generate.outputs.TEST_DIRS }}"
 
     steps:
       - uses: actions/checkout@v4
@@ -34,29 +34,29 @@ jobs:
           echo '::endgroup::'
 
       - name: Generate matrix
-        id: matrix
+        id: generate
         shell: uv run -- python {0}
         run: |
           from pathlib import Path
           from os import environ
-          matrix = set()
+          test_dirs = set()
           with open("collected.txt", encoding="utf-8") as lines:
             for line in lines:
               parts = line.strip().partition("::")
-              matrix.add(str(Path(parts[0]).parent))
-          matrix = sorted(list(matrix))
-          print(matrix)
+              test_dirs.add(str(Path(parts[0]).parent))
+          test_dirs = { "test_dirs": sorted(list(test_dirs)) }
+          print(test_dirs)
           with open(environ["GITHUB_OUTPUT"], "a", encoding="utf-8") as f:
-            print(f"TEST_MATRIX={matrix}", file=f)
+            print(f"TEST_DIRS={test_dirs}", file=f)
 
   test:
     name: Test
     runs-on: ubuntu-latest
     needs: collect
 
-    strategy:
-      matrix:
-        test_dir: ${{ needs.collect.outputs.TEST_MATRIX }}
+    # strategy:
+    #   matrix:
+    #     test_dirs: ${{ needs.collect.outputs.TEST_DIRS }}
     #     test_dir: ["tests", "tests/dir1", "tests/dir2", "tests/dir3"]
 
     steps:
@@ -72,7 +72,7 @@ jobs:
           uv sync --locked; echo
           uv tree
 
-      - name: Run test
-        run: uv run -- pytest '${{ matrix.test_dir }}'
+      # - name: Run test
+      #   run: uv run -- pytest '${{ matrix.test_dir }}'
 
-      - run: echo "TEST_MATRIX is '${{ needs.collect.outputs.TEST_MATRIX }}'"
+      - run: echo "TEST_DIRS is '${{ needs.collect.outputs.TEST_DIRS }}'"