Added code coverage checks

Author: tluijken

.github/workflows/cargo-build-and-test.yaml

@@ -16,15 +16,27 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
+          target: x86_64-unknown-linux-musl
           override: true
+          components: llvm-tools-preview
+      - name: Download grcov
+        run: |
+          mkdir -p "${HOME}/.local/bin"
+          curl -sL https://github.com/mozilla/grcov/releases/download/v0.8.10/grcov-x86_64-unknown-linux-gnu.tar.bz2 | tar jxf - -C "${HOME}/.local/bin"
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
       - uses: actions-rs/cargo@v1
         name: cargo update
         with:
           command: update
-      - uses: actions-rs/cargo@v1
-        name: cargo test
+      - name: cargo test
+        run: |
+          CARGO_INCREMENTAL=0 RUSTFLAGS='-Cinstrument-coverage' LLVM_PROFILE_FILE='cargo-test-%p-%m.profraw' cargo test
+          grcov . --binary-path ./target/debug/deps/ -s . -t lcov --branch --ignore-not-existing --ignore '../*' --ignore "/*" -o target/coverage/tests.lcov
+      - name: Check test coverage
+        uses: terencetcf/github-actions-lcov-minimum-coverage-checker@v1
         with:
-          command: test
+          coverage-file: ./target/coverage/tests.lcov
+          minimum-coverage: 90
 
   publish_to_crates_io:
     name: "Publish to crates.io"