为什么我预期的拒绝不是使用 chai-as-promise 的 mocha 的成功案例？

Question

我想在 mocha 测试用例中断言承诺拒绝。因此我在打字稿中这样做：

import {
    expect,
    use,
} from "chai";
import * as chaiAsPromised from "chai-as-promised";

use(chaiAsPromised);

describe("Promise rejection", async () => {

    it("should assert promise rejection", async () => {
        const msg = "I AM THE EXPECTED ERROR";

        const rejectedPromise = Promise.reject(msg);

        return expect(rejectedPromise).to.eventually.throw(msg);

    });
});

我希望我的测试用例能够成功，因为会抛出预期的错误。然而我的测试失败了：

Error: the string "I AM THE EXPECTED ERROR" was thrown, throw an Error :)
    at <anonymous>
    at runMicrotasksCallback (internal/process/next_tick.js:122:5)
    at _combinedTickCallback (internal/process/next_tick.js:132:7)
    at process._tickCallback (internal/process/next_tick.js:181:9)

Answer 1

您想测试承诺拒绝，而不是错误。因此使用 rejectedWith:

return expect(rejectedPromise).to.eventually.be.rejectedWith(msg);

为什么我预期的拒绝不是使用 chai-as-promise 的 mocha 的成功案例？

Why is my expected rejection not a success case in mocha using chai-as-promise?

mocha.js

promise

chai

typescript

chai-as-promised