test: add test case for Q25 (webfansplz#594)

Author: holazz

questions/25-useMouse/README.md

@@ -0,0 +1,23 @@
+import { mount } from "@vue/test-utils"
+import { describe, it, expect } from "vitest"
+import { nextTick } from "vue"
+
+import App from "./App.vue"
+
+describe("useMouse", () => {
+  it("should work", async() => {
+    const wrapper = mount(App)
+    expect(wrapper.html()).toBe("Mouse position is at: 0, 0")
+
+    const mousemove = new MouseEvent("mousemove", {
+      screenX: 10,
+      screenY: 20,
+      clientX: 10,
+      clientY: 20,
+    })
+    window.dispatchEvent(mousemove)
+
+    await nextTick()
+    expect(wrapper.html()).toBe("Mouse position is at: 10, 20")
+  })
+})