tests: seed CodeEntropy regression subprocess

Author: harryswift01

tests/regression/helpers.py

@@ -3,6 +3,7 @@
 import json
 import os
 import subprocess
+import sys
 import tarfile
 import urllib.request
 from dataclasses import dataclass
@@ -366,12 +367,18 @@ def run_codeentropy_with_config(*, workdir: Path, config_src: Path) -> RunResult
 
     (workdir / "config.yaml").write_text(yaml.safe_dump(cooked, sort_keys=False))
 
+    env = {
+        **os.environ,
+        "PYTHONHASHSEED": "0",
+        "CODEENTROPY_RANDOM_SEED": "0",
+    }
+
     proc = subprocess.run(
-        ["python", "-m", "CodeEntropy"],
+        [sys.executable, "-m", "tests.regression.seeded_runner"],
         cwd=str(workdir),
         capture_output=True,
         text=True,
-        env={**os.environ},
+        env=env,
     )
 
     (workdir / "codeentropy_stdout.txt").write_text(proc.stdout or "")

tests/regression/seeded_runner.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+import os
+import random
+import runpy
+
+import numpy as np
+
+
+def main() -> None:
+    """Seed supported random generators and start CodeEntropy."""
+    seed = int(os.environ.get("CODEENTROPY_RANDOM_SEED", "0"))
+
+    random.seed(seed)
+    np.random.seed(seed)
+
+    runpy.run_module("CodeEntropy", run_name="__main__")
+
+
+if __name__ == "__main__":
+    main()