Added --features testing to coverage command args

Author: Andrew J Westlake

.github/workflows/ci.yml

@@ -137,8 +137,8 @@ jobs:
           profile: minimal
       - uses: actions-rs/cargo@v1
         with:
-          command: test
-          args:
+          command: test 
+          args: --features testing
         env:
           CARGO_INCREMENTAL: 0
           RUSTFLAGS: "-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=abort -Zpanic_abort_tests"