Close shifted oracle frontier boundaries

tests/test_oracle_gap.py

@@ -9,7 +9,12 @@ ORACLE_GAP = Path(__file__).resolve().parents[1] / "scripts/oracle_gap"
 sys.path.insert(0, str(ORACLE_GAP))
 
 from analyze import score_trial, summarize_trials  # noqa: E402
-from run_frontier import AMENDMENT, UP_EXTENSIONS, resume_compatible  # noqa: E402
+from run_frontier import (  # noqa: E402
+    AMENDMENT,
+    UP_EXTENSIONS,
+    boundary_closure_needs,
+    resume_compatible,
+)
 
 
 def _request(
@@ -175,7 +180,7 @@ def test_a_og_1_extends_only_mutable_resume_fields() -> None:
     )
 
 
-def test_a_og_3_requires_the_amended_grid_to_stay_fixed() -> None:
+def test_a_og_4_requires_the_amended_grid_to_stay_fixed() -> None:
     old = {
         "analyzer_sha256": "analyzer",
         "p5_client_sha256": "p5",
@@ -190,9 +195,21 @@ def test_a_og_3_requires_the_amended_grid_to_stay_fixed() -> None:
         "up_extensions": {"P01": [38.0], "P06": [2.1, 2.2, 2.3, 2.4]},
     }
 
-    assert AMENDMENT == "A-OG-3"
+    assert AMENDMENT == "A-OG-4"
     assert resume_compatible(old, {**old, "controller_sha256": "new"})
     assert not resume_compatible(
         old,
         {**old, "up_extensions": {"P01": [38.0], "P06": [2.1, 2.2, 2.3, 2.5]}},
     )
+
+
+def test_boundary_closure_follows_a_majority_shift() -> None:
+    rows = []
+    rows.append(_frontier_row("P06", "C00", 2.3, True))
+    rows.extend(_frontier_row("P06", "C00", 2.4, value) for value in (True, False, False))
+    rows.extend(_frontier_row("P06", "C00", 2.5, False) for _ in range(3))
+
+    assert boundary_closure_needs(rows) == [2.3]
+
+    rows.extend(_frontier_row("P06", "C00", 2.3, True) for _ in range(2))
+    assert boundary_closure_needs(rows) == []