From 700167de301c178ab0a8b6d20fed5d2629adbf3d Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Mon, 8 Jun 2026 12:22:24 +0000
Subject: [PATCH 1/2] =?UTF-8?q?=F0=9F=A7=AA=20[Testing=20Improvement]=20Ad?=
 =?UTF-8?q?d=20tests=20for=20invalidateCapturedCheckpointPositions?=
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Content-Type: text/plain; charset=UTF-8
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---
 test_plan.ts                    |  4 +++
 tests/unit/undo-history.test.ts | 48 +++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 test_plan.ts

diff --git a/test_plan.ts b/test_plan.ts
new file mode 100644
index 0000000..c2d174e
--- /dev/null
+++ b/test_plan.ts
@@ -0,0 +1,4 @@
+import { ModificationTracker } from "./src/core/undo-history";
+
+const tracker = new ModificationTracker<any>(1);
+console.log((tracker as any).getCheckpointInvalidationRevision());
diff --git a/tests/unit/undo-history.test.ts b/tests/unit/undo-history.test.ts
index 0c0440b..4468292 100644
--- a/tests/unit/undo-history.test.ts
+++ b/tests/unit/undo-history.test.ts
@@ -142,3 +142,51 @@ describe('ModificationTracker hot-exit persistence', () => {
     assert.strictEqual(t.hasUncommittedChanges(), true); // e3 still uncommitted
   });
 });
+
+describe('invalidateCapturedCheckpointPositions', () => {
+  it('increments checkpointInvalidationRevision on timeline eviction', () => {
+    const tracker = new ModificationTracker<LabeledModification>(1);
+    tracker.record(entry('e1'));
+    const initialRevision = tracker.getCheckpointInvalidationRevision();
+    tracker.record(entry('e2'));
+    assert.strictEqual(tracker.getCheckpointInvalidationRevision(), initialRevision + 1);
+  });
+
+  it('increments checkpointInvalidationRevision on stepBack (undo)', () => {
+    const tracker = new ModificationTracker<LabeledModification>();
+    tracker.record(entry('e1'));
+    const preUndoRevision = tracker.getCheckpointInvalidationRevision();
+    tracker.stepBack();
+    assert.strictEqual(tracker.getCheckpointInvalidationRevision(), preUndoRevision + 1);
+  });
+
+  it('increments checkpointInvalidationRevision on rollbackToCheckpoint with undone entries', async () => {
+    const tracker = new ModificationTracker<LabeledModification>();
+    tracker.record(entry('e1'));
+    tracker.record(entry('e2'));
+    await tracker.createCheckpoint();
+    tracker.stepBack();
+    const preRollbackRevision = tracker.getCheckpointInvalidationRevision();
+    tracker.rollbackToCheckpoint();
+    assert.strictEqual(tracker.getCheckpointInvalidationRevision(), preRollbackRevision + 1);
+  });
+
+  it('increments checkpointInvalidationRevision on rollbackToCheckpoint with uncommitted entries', async () => {
+    const tracker = new ModificationTracker<LabeledModification>();
+    tracker.record(entry('e1'));
+    await tracker.createCheckpoint();
+    tracker.record(entry('e2'));
+    const preRollbackRevision = tracker.getCheckpointInvalidationRevision();
+    tracker.rollbackToCheckpoint();
+    assert.strictEqual(tracker.getCheckpointInvalidationRevision(), preRollbackRevision + 1);
+  });
+
+  it('does NOT increment checkpointInvalidationRevision when rollbackToCheckpoint causes no change', async () => {
+    const tracker = new ModificationTracker<LabeledModification>();
+    tracker.record(entry('e1'));
+    await tracker.createCheckpoint();
+    const preRollbackRevision = tracker.getCheckpointInvalidationRevision();
+    tracker.rollbackToCheckpoint();
+    assert.strictEqual(tracker.getCheckpointInvalidationRevision(), preRollbackRevision);
+  });
+});

From 400a1ce64a9b57e8ebbe00edfa4c55cdb48f76ec Mon Sep 17 00:00:00 2001
From: zknpr <zknpr_gh@protonmail.com>
Date: Mon, 8 Jun 2026 18:35:44 +0200
Subject: [PATCH 2/2] chore: remove committed test_plan.ts scratch file

---
 test_plan.ts | 4 ----
 1 file changed, 4 deletions(-)
 delete mode 100644 test_plan.ts

diff --git a/test_plan.ts b/test_plan.ts
deleted file mode 100644
index c2d174e..0000000
--- a/test_plan.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-import { ModificationTracker } from "./src/core/undo-history";
-
-const tracker = new ModificationTracker<any>(1);
-console.log((tracker as any).getCheckpointInvalidationRevision());