使用 spyOn 工具程式來追蹤 Bun 測試執行器的方法呼叫。
import { test, expect, spyOn } from "bun:test";
const leo = {
name: "Leonardo",
sayHi(thing: string) {
console.log(`Sup I'm ${this.name} and I like ${thing}`);
},
};
const spy = spyOn(leo, "sayHi");
一旦建立偵測器，就可以用它來編寫與方法呼叫相關的 expect 斷言。
import { test, expect, spyOn } from "bun:test";
const leo = {
name: "Leonardo",
sayHi(thing: string) {
console.log(`Sup I'm ${this.name} and I like ${thing}`);
},
};
const spy = spyOn(leo, "sayHi");
test("turtles", ()=>{
expect(spy).toHaveBeenCalledTimes(0);
leo.sayHi("pizza");
expect(spy).toHaveBeenCalledTimes(1);
expect(spy.mock.calls).toEqual([[ "pizza" ]]);
})請參閱文件 > 測試執行器 > 模擬，以取得關於 Bun 測試執行器模擬的完整文件。