add cpp sdk code coverage action to the ci (#43128)

Co-authored-by: Artem Ermoshkin <[email protected]>
Co-authored-by: Copilot Autofix powered by AI <[email protected]>

1 files changed, 36 insertions, 0 deletions

diff --git a/.github/scripts/tests/compare_cpp_sdk_coverage.py b/.github/scripts/tests/compare_cpp_sdk_coverage.py
new file mode 100755
index 00000000000..13b6f6c8561
--- /dev/null
+++ b/.github/scripts/tests/compare_cpp_sdk_coverage.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+import json
+import re
+import sys
+from pathlib import Path
+
+
+def line_pct(report_dir: str) -> float:
+    html = (Path(report_dir) / "index.html").read_text(encoding="utf-8", errors="replace")
+    match = re.search(r"Lines:</td>\s*<td[^>]*>([\d.]+)\s*%", html, re.I)
+    if not match:
+        raise SystemExit(f"line coverage not found in {report_dir}/index.html")
+    return float(match.group(1))
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        raise SystemExit("usage: compare_cpp_sdk_coverage.py {extract|check} ...")
+
+    cmd = sys.argv[1]
+    if cmd == "extract":
+        if len(sys.argv) != 4:
+            raise SystemExit("usage: compare_cpp_sdk_coverage.py extract <report_dir> <out_json>")
+        with open(sys.argv[3], "w", encoding="utf-8") as f:
+            json.dump({"line_pct": line_pct(sys.argv[2])}, f)
+    elif cmd == "check":
+        if len(sys.argv) != 4:
+            raise SystemExit("usage: compare_cpp_sdk_coverage.py check <current_json> <baseline_json>")
+        with open(sys.argv[2], encoding="utf-8") as f:
+            current = json.load(f)["line_pct"]
+        with open(sys.argv[3], encoding="utf-8") as f:
+            baseline = json.load(f)["line_pct"]
+        print(f"CPP SDK line coverage: {current}% (baseline: {baseline}%)", file=sys.stderr)
+        sys.exit(1 if current < baseline else 0)
+    else:
+        raise SystemExit(f"unknown command: {cmd}")