Reduce CI time by parallelizing per-curve tests (#52)

.github/workflows/ci.yml

@@ -29,8 +29,8 @@ jobs:
         command: fmt
         args: --all -- --check
 
-  test:
-    name: Test
+  check:
+    name: Check
     runs-on: ubuntu-latest
     env:
       RUSTFLAGS: -Dwarnings
@@ -78,13 +78,39 @@ jobs:
             args: --all-features --examples --workspace --benches
         if: matrix.rust == 'nightly'
 
-      - name: Test
-        uses: actions-rs/cargo@v1
-        with:
-            command: test
-            args: "--workspace \
-                   --all-features \
-                   --exclude curve-benches"
+
+
+  directories: # Job that list subdirectories
+    name: List directories for parallelizing tests
+    runs-on: ubuntu-latest
+    outputs:
+      dir: ${{ steps.set-dirs.outputs.dir }} # generate output name dir by using inner step output
+    steps:
+      - uses: actions/checkout@v2
+      - id: set-dirs # Give it an id to handle to get step outputs in the outputs key above
+        run: echo "::set-output name=dir::$(ls -d */ | jq -R -s -c 'split("\n")[:-1]')"
+        # Define step output named dir base on ls command transformed to JSON thanks to jq
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    needs: [directories] # Depends on previous job
+    strategy:
+      matrix:
+        dir: ${{fromJson(needs.directories.outputs.dir)}} # List matrix strategy from directories dynamically
+        # rust:
+        #   - stable
+        #   - nightly
+        exclude:
+          - dir: scripts/
+          - dir: curve-constraint-tests/
+          - dir: curve-benches/
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Run tests
+        run: |
+          cd ${{matrix.dir}}
+          cargo test --all-features
 
   docs:
     name: Check Documentation