源码快照 @ 2026-09-02 (source-only, 剔除非源码素材)

apps/app/tests/session-transition-controller.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, test } from "bun:test";
+
+import { deriveSessionRenderModel } from "../src/react-app/domains/session/sync/transition-controller";
+
+describe("session render transitions", () => {
+  test("keeps an already-rendered current session interactive during background refresh", () => {
+    expect(deriveSessionRenderModel({
+      intendedSessionId: "session-current",
+      renderedSessionId: "session-current",
+      hasSnapshot: true,
+      isFetching: true,
+      isError: false,
+    })).toEqual({
+      intendedSessionId: "session-current",
+      renderedSessionId: "session-current",
+      transitionState: "idle",
+      renderSource: "live",
+    });
+  });
+
+  test("still reports switching while the intended session has no rendered snapshot", () => {
+    expect(deriveSessionRenderModel({
+      intendedSessionId: "session-next",
+      renderedSessionId: null,
+      hasSnapshot: false,
+      isFetching: true,
+      isError: false,
+    }).transitionState).toBe("switching");
+  });
+
+  test("still reports switching when a different session remains rendered", () => {
+    expect(deriveSessionRenderModel({
+      intendedSessionId: "session-next",
+      renderedSessionId: "session-previous",
+      hasSnapshot: true,
+      isFetching: true,
+      isError: false,
+    }).transitionState).toBe("switching");
+  });
+});