"""Regression for deterministic package mtimes and root-created Python caches."""
import os
from pathlib import Path
import py_compile
import runpy
import subprocess
import sys
import tempfile
import unittest


class UpgradeTests(unittest.TestCase):
    def test_same_size_source_with_old_pyc_loads_new_version_after_installer_step(self):
        clear = runpy.run_path(str(Path(__file__).parents[1] / "packaging/clear_runtime_cache.py"))["clear"]
        with tempfile.TemporaryDirectory() as tmp:
            root = Path(tmp); package = root / "runtime"; package.mkdir()
            init = package / "__init__.py"; init.write_text('VERSION="0.1.0"\n'); os.utime(init,(0,0))
            py_compile.compile(str(init),doraise=True)
            init.write_text('VERSION="0.2.0"\n');os.utime(init,(0,0))
            backup=root/'backup.json';backup.write_text('preserve')
            code='import sys;sys.path.insert(0,sys.argv[1]);import runtime;print(runtime.VERSION)'
            def version():return subprocess.check_output([sys.executable,'-I','-B','-c',code,str(root)],text=True).strip()
            self.assertEqual(version(),'0.1.0')
            clear(root);clear(root)
            self.assertEqual(version(),'0.2.0')
            self.assertEqual(backup.read_text(),'preserve')