完善测试

docs/test-plan-zh.md

@@ -59,6 +59,13 @@
 - 使用事件循环等待完成。
 - 验证任务确实执行。
 
+## 单元覆盖重点（已扩展）
+
+- `app/undo`：`undo_stack_test.cpp` 覆盖空栈状态、模型数据、redo 区域颜色、jump 行为、空 MultiUndoCommand 忽略逻辑。
+- `app/timeline`：`timeline_marker_test.cpp` 覆盖列表排序、最近 marker 查询、含未知元素的保存/加载、marker 增删改命令。
+- `app/pluginSupport`：`plugin_support_image_test.cpp` 覆盖 OFX 属性映射（bounds/ROD、像素深度、通道、预乘）及分配/清理行为。
+- `app/render`：`render_videoparams_branch_test.cpp` 覆盖自动 divider、像素宽高比校验、方形像素宽度、Save/Load 回归。
+
 ## 无 GUI 运行
 
 - 测试避免使用 QWidget。

docs/test-plan.md

@@ -59,6 +59,13 @@ If a module has a GUI dependency (e.g., widgets), tests focus on non-visual data
 - Waits for completion using an event loop.
 - Verifies the task ran.
 
+## Unit Coverage Highlights (Expanded)
+
+- `app/undo`: `undo_stack_test.cpp` now covers empty stack state, model data, redo list coloring, jump behavior, and ignored empty multi-commands.
+- `app/timeline`: `timeline_marker_test.cpp` now covers list ordering, closest-marker lookup, list save/load with unknown elements, and marker add/remove/change commands.
+- `app/pluginSupport`: `plugin_support_image_test.cpp` now checks OFX property wiring (bounds/ROD, pixel depth, components, premult) and allocation clearing behavior.
+- `app/render`: `render_videoparams_branch_test.cpp` now covers auto divider selection, pixel aspect validation, square-pixel width, and Save/Load roundtrip.
+
 ## Headless Execution
 
 - Tests avoid QWidget usage.