test: add Gate 3 numerical oracle contracts

scripts/mutmut_coverage_sitecustomize/sitecustomize.py

@@ -0,0 +1,60 @@
+"""Fail-closed mutmut prepared-artifact reuse hooks for CI."""
+
+from __future__ import annotations
+
+import os
+
+
+if (
+    os.environ.get("OBLITERATUS_MUTMUT_REUSE_COVERAGE") == "1"
+    or os.environ.get("OBLITERATUS_MUTMUT_REUSE_STATS") == "1"
+    or os.environ.get("OBLITERATUS_MUTMUT_SUBPROCESS_PREFLIGHT") == "1"
+):
+    from mutmut import __main__ as mutmut_main
+
+    from scripts.prepare_mutation_coverage import validate_execution_manifest
+    from scripts.prepare_mutation_coverage import validate_manifest
+
+    def store_lines_covered_by_tests_from_prepared_artifacts() -> None:
+        validate_manifest()
+        print("Reusing prepared mutmut covered-line artifacts")
+
+    mutmut_main.store_lines_covered_by_tests = store_lines_covered_by_tests_from_prepared_artifacts
+
+    if os.environ.get("OBLITERATUS_MUTMUT_REUSE_STATS") == "1":
+
+        def collect_or_load_prepared_stats(
+            runner,
+            *,
+            mutants_caught_by_type_checker=None,
+            apply_config_invalidation=False,
+            invalidate_stale_callers=True,
+        ) -> None:
+            del runner, mutants_caught_by_type_checker
+            del apply_config_invalidation, invalidate_stale_callers
+            validate_execution_manifest()
+            if not mutmut_main.load_stats():
+                raise RuntimeError("prepared mutmut stats failed to load")
+            print("Reusing prepared mutmut test-selection stats")
+
+        mutmut_main.collect_or_load_stats = collect_or_load_prepared_stats
+
+    if os.environ.get("OBLITERATUS_MUTMUT_SUBPROCESS_PREFLIGHT") == "1":
+        _original_execute_pytest = mutmut_main.PytestRunner.execute_pytest
+
+        def execute_pytest_with_subprocess_preflight(self, params, **kwargs):
+            if kwargs:
+                return _original_execute_pytest(self, params, **kwargs)
+            if os.environ.get("MUTANT_UNDER_TEST") not in {"", "fail"}:
+                return _original_execute_pytest(self, params, **kwargs)
+
+            import subprocess
+            import sys
+
+            full_params = ["--rootdir=.", "--tb=native", *params, *self._pytest_add_cli_args]
+            result = subprocess.run([sys.executable, "-m", "pytest", *full_params], check=False)
+            if result.returncode == 4:
+                raise mutmut_main.BadTestExecutionCommandsException(full_params)
+            return int(result.returncode)
+
+        mutmut_main.PytestRunner.execute_pytest = execute_pytest_with_subprocess_preflight