Display Coverage of CPP Unittests

Display CPP Unittest Coverage with lcov

Author: joshualicht

.github/workflows/check.yml

@@ -76,3 +76,15 @@ jobs:
             --nocache_test_results \
             --nostamp
 
+      - name: Install lcov
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y lcov
+
+      - name: Extract Coverage for kvs.cpp
+        run: |
+          REPORT=$(find "$(bazel info output_path)" -name _coverage_report.dat | head -n1)
+          lcov \
+            --rc lcov_branch_coverage=1 \
+            --extract "$REPORT" "src/cpp/src/kvs.cpp" \
+            --output-file kvs_coverage.info