使用 spyOn 工具來跟蹤 Bun 的測試執行器中的方法呼叫。
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");
建立間諜後，即可使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" ]]);
})有關 Bun 測試執行器模擬的完整文件，請參閱 文件 > 測試執行器 > 模擬。