diff --git a/.changeset/calm-events-listen.md b/.changeset/calm-events-listen.md
new file mode 100644
index 000000000..ae84855e8
--- /dev/null
+++ b/.changeset/calm-events-listen.md
@@ -0,0 +1,5 @@
+---
+'@plait/core': patch
+---
+
+add a framework-independent board event observer for plugin tests
diff --git a/docs/guides/solutions/unit-test.md b/docs/guides/solutions/unit-test.md
index d1d09cf3a..3f3f43e50 100644
--- a/docs/guides/solutions/unit-test.md
+++ b/docs/guides/solutions/unit-test.md
@@ -44,6 +44,29 @@ afterEach(() => {
 });
 ```
 
+#### 验证插件是否向下游传递事件
+
+当测试需要确认一个插件没有吞掉事件，而是把事件继续交给下游处理器时，可以使用 `createBoardEventObserver`：
+
+```ts
+import { createBoardEventObserver, createPointerEvent, setupTestingBoard } from '@plait/core';
+
+const observer = createBoardEventObserver(['pointerDown']);
+const fixture = setupTestingBoard([observer.plugin, pluginUnderTest], []);
+const event = createPointerEvent('pointerdown');
+
+fixture.board.pointerDown(event);
+
+expect(observer.calls.pointerDown).toEqual([event]);
+
+observer.clear();
+fixture.destroy();
+```
+
+插件顺序需要保持为 `[observer.plugin, pluginUnderTest]`。插件从左到右应用，因此待测插件会包裹观察器；只有待测插件确实调用了下游处理器，事件才会出现在 `observer.calls` 中。
+
+`createBoardEventObserver` 只负责记录指定事件并继续调用原处理器，不依赖 Jasmine、Vitest 或 Jest。`clear()` 只清空调用记录，Board 相关测试资源仍应通过 `fixture.destroy()` 清理。
+
 另外分类 3 在写测试的时候需要注意，如果一个测试用例里面包含超过一次的数据修改，那么在每一次的数据修改后都需要重新调用 fakeNodeWeakmap 构建基于最新数据引用的父子关系依赖：
 
 ```
@@ -73,4 +96,3 @@ it('should replace emoji success', () => {
 不得不说写单元测试是一件非常难的事情，而把单元测试写的有条理则更难，因为它首先需要你的代码是有条理的（模块划分是否清楚、调用关系/目录关系是否统一、函数职责是否唯一/或者存在重复），如果代码结构、调用关系、职责划分等等不清晰，你的单元测试则会很混乱（无法按照一个统一的思路把所有的分支逻辑全部覆盖），或者出现重复功能的单元测试，必然会造成时间的浪费，也会消磨维护单元测试的信心。
 
 
-
diff --git a/packages/core/src/testing/create-board-event-observer.ts b/packages/core/src/testing/create-board-event-observer.ts
new file mode 100644
index 000000000..04f1cafae
--- /dev/null
+++ b/packages/core/src/testing/create-board-event-observer.ts
@@ -0,0 +1,47 @@
+import { PlaitPlugin } from '../interfaces';
+
+export type BoardEventName = 'pointerDown' | 'pointerMove' | 'pointerUp' | 'globalPointerUp' | 'touchStart';
+
+export type BoardEventCalls = Partial<Record<BoardEventName, Event[]>>;
+
+/**
+ * Creates a plugin that records events delegated by plugins applied after it.
+ *
+ * Place the observer before the plugin under test in the plugin list so that it
+ * observes events delegated downstream:
+ * `[observer.plugin, pluginUnderTest]`.
+ */
+export const createBoardEventObserver = (eventNames: BoardEventName[]) => {
+    const calls: BoardEventCalls = {};
+
+    eventNames.forEach((eventName) => {
+        calls[eventName] = [];
+    });
+
+    const plugin: PlaitPlugin = (board) => {
+        eventNames.forEach((eventName) => {
+            const downstream = board[eventName] as (event: Event) => void;
+
+            Object.assign(board, {
+                [eventName]: (event: Event) => {
+                    calls[eventName]!.push(event);
+                    downstream(event);
+                }
+            });
+        });
+
+        return board;
+    };
+
+    const clear = () => {
+        eventNames.forEach((eventName) => {
+            calls[eventName]!.length = 0;
+        });
+    };
+
+    return {
+        plugin,
+        calls,
+        clear
+    };
+};
diff --git a/packages/core/src/testing/index.ts b/packages/core/src/testing/index.ts
index 412389f2f..f93fa4cb2 100644
--- a/packages/core/src/testing/index.ts
+++ b/packages/core/src/testing/index.ts
@@ -1,2 +1,3 @@
 export * from './fixture';
 export * from './mock-events';
+export * from './create-board-event-observer';