Add CI test

.github/workflows/ci.yml

@@ -20,6 +20,7 @@ jobs:
     needs:
       - test
       - test-unstable
+      - test-parking_lot
       - miri
       - cross
       - features
@@ -77,6 +78,20 @@ jobs:
         # bench.yml workflow runs benchmarks only on linux.
         if: startsWith(matrix.os, 'ubuntu')
 
+  test-parking_lot:
+    name: compile tests with parking lot send guards
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Rust
+        run: rustup update stable
+      - uses: Swatinem/rust-cache@v1
+      - name: Enable parking_lot send_guard feature
+        # Inserts the line "plsend = ["parking_lot/send_guard"]" right after [dependencies]
+        run: sed -i '/\[dependencies\]/a plsend = ["parking_lot/send_guard"]' tokio/Cargo.toml
+      - name: Compile tests with all features enabled
+        run: cargo build --workspace --all-features --tests
+
   valgrind:
     name: valgrind
     runs-on: ubuntu-latest