| 1 | #!/usr/bin/env python3 |
| 2 | """Print the slowest tests from Go's JSON test stream.""" |
| 3 | |
| 4 | import argparse |
| 5 | import json |
| 6 | import sys |
| 7 | |
| 8 | |
| 9 | def events_from(path): |
| 10 | stream = sys.stdin if path == "-" else open(path, "r", encoding="utf-8") |
| 11 | try: |
| 12 | for line in stream: |
| 13 | try: |
| 14 | yield json.loads(line) |
| 15 | except json.JSONDecodeError: |
| 16 | continue |
| 17 | finally: |
| 18 | if stream is not sys.stdin: |
| 19 | stream.close() |
| 20 | |
| 21 | |
| 22 | def main(): |
| 23 | parser = argparse.ArgumentParser( |
| 24 | description="Rank test cases from `go test -json` output by elapsed seconds." |
| 25 | ) |
| 26 | parser.add_argument("json_file", nargs="?", default="-", help="JSON stream file, or stdin") |
| 27 | parser.add_argument("-n", "--limit", type=int, default=20, help="number of rows to print") |
| 28 | parser.add_argument("--min", type=float, default=0.0, help="minimum elapsed seconds") |
| 29 | args = parser.parse_args() |
| 30 | |
| 31 | rows = [] |
| 32 | for event in events_from(args.json_file): |
| 33 | if event.get("Action") not in {"pass", "fail", "skip"}: |
| 34 | continue |
| 35 | test = event.get("Test") |
| 36 | elapsed = event.get("Elapsed") |
| 37 | if not test or elapsed is None or elapsed < args.min: |
| 38 | continue |
| 39 | package = event.get("Package", "") |
| 40 | name = f"{package}.{test}" if package else test |
| 41 | rows.append((float(elapsed), event["Action"], name)) |
| 42 | |
| 43 | rows.sort(key=lambda row: row[0], reverse=True) |
| 44 | if not rows: |
| 45 | print("No test timing rows found.") |
| 46 | return |
| 47 | |
| 48 | print(f"{'SECONDS':>8} {'STATE':<5} TEST") |
| 49 | for elapsed, action, name in rows[: args.limit]: |
| 50 | print(f"{elapsed:8.3f} {action:<5} {name}") |
| 51 | |
| 52 | |
| 53 | if __name__ == "__main__": |
| 54 | main() |
| 55 |