tests(issue-28): Introduce code coverage

Add script for local coverage checking and extended tests job in ci to produce code coverage and publish to codecov.

.github/workflows/ci.yml

@@ -37,7 +37,19 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
-      - run: cargo test --workspace
+      - run: |
+          export RUSTFLAGS="-Cinstrument-coverage"
+          export LLVM_PROFILE_FILE="cargo-tests-%p-%m.profraw"
+          cargo test --workspace
+          grcov . --binary-path ./target/debug/deps/ \
+          --source-dir . \
+          --output-types cobertura \
+          --branch \
+          --ignore-not-existing \
+          --ignore **/tests.rs  \
+          --ignore "/*" \
+          --output-path .
+          bash <(curl -s https://codecov.io/bash) && echo "Uploaded code coverage"
 
   build:
     name: Build

.gitignore

@@ -3,4 +3,5 @@ target
 .secrets
 .test_data
 .run
-logs
+logs
+**/*.profraw

scripts/generate_coverage_report.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+export RUSTFLAGS="-Cinstrument-coverage"
+export LLVM_PROFILE_FILE="cargo-tests-%p-%m.profraw"
+cargo test --workspace
+mkdir -p target/coverage
+grcov . --binary-path ./target/debug/deps/ \
+--source-dir . \
+--output-types lcov,html,markdown,cobertura \
+--branch \
+--ignore-not-existing \
+--ignore **/tests.rs  \
+--ignore "/*" \
+--output-path target/coverage
+find . -name '*.profraw' -type f -delete