Cover timeline epoch reset behavior

2026-05-29 09:55:40 +07:00
parent 65ace20880
commit 0ee76b2ea0
2 changed files with 49 additions and 0 deletions
@@ -388,6 +388,41 @@ describe("processTimelineResponse", () => {
    expect(getUserTexts(result.tail)).toHaveLength(0);
  });

+  it("treats a stale epoch reset as a replacement with the new epoch window", () => {
+    const oldTail: StreamItem[] = [makeAssistantItem("old epoch message", "old-assistant")];
+    const oldHead: StreamItem[] = [makeAssistantItem("old live head", "old-head")];
+
+    const result = processTimelineResponse({
+      ...baseTimelineInput,
+      currentTail: oldTail,
+      currentHead: oldHead,
+      currentCursor: { epoch: "old-epoch", startSeq: 1, endSeq: 95 },
+      payload: {
+        ...baseTimelineInput.payload,
+        reset: true,
+        epoch: "new-epoch",
+        startCursor: { seq: 101 },
+        endCursor: { seq: 105 },
+        hasOlder: true,
+        entries: [
+          makeTimelineEntry(101, "new one"),
+          makeTimelineEntry(102, "new two"),
+          makeTimelineEntry(103, "new three"),
+          makeTimelineEntry(104, "new four"),
+          makeTimelineEntry(105, "new five"),
+        ],
+      },
+    });
+
+    expect(getAssistantTexts(result.tail)).toEqual(["new onenew twonew threenew fournew five"]);
+    expect(result.head).toEqual([]);
+    expect(result.cursor).toEqual({ epoch: "new-epoch", startSeq: 101, endSeq: 105 });
+    expect(result.sideEffects).not.toContainEqual({
+      type: "catch_up",
+      cursor: { epoch: "old-epoch", endSeq: 95 },
+    });
+  });
+
  it("performs bootstrap tail init with catch-up side effect", () => {
    const result = processTimelineResponse({
      ...baseTimelineInput,