tenseleyflow/sway / 4e01c30

+    def test_degenerate_flag_rejects_even_valid_std(self) -> None:

+        """F02 (Audit 03) — when null_adapter marks stats as degenerate

+        (``runs: 1`` or coincidentally-identical seeds), ``z_score``

+        refuses to divide even though the floored std passes MIN_STD.

+        This is what prevents the observed ``+290,766σ`` output on a

+        ``runs: 1`` leakage probe."""

+        stats = {"mean": 0.01, "std": MIN_STD, "degenerate": 1.0}

+        assert z_score(0.30, stats) is None

+

+    def test_non_degenerate_flag_does_not_change_behavior(self) -> None:

+        """A ``degenerate: 0.0`` marker on an otherwise-valid stats

+        dict behaves identically to the no-marker path."""

+        stats = {"mean": 0.01, "std": 0.01, "degenerate": 0.0}

+        assert z_score(0.08, stats) is not None

+