使用 chai 检查 typescript/nodejs 中的异常不起作用

Question

我在打字稿代码中使用 chai 断言测试我的简单函数时遇到问题

我有：

    public async test1(){
     throw (new Error(COUCH_CONNECTION_ERROR.message));
    }

其中沙发连接错误是这样定义的：

export const COUCH_CONNECTION_ERROR: IErrorModel = {
  code: "couch_connection_error",
  message: "Unable to connect to Couchdb.",
};

现在我这样写了一个测试：

    it("test", ()=>{

    console.log(obj.test1());
    expect(obj.test1()).to.throw(Error, COUCH_CONNECTION_ERROR.message)
    console.log(`ccccccccccccccccc`);
})

所以当我运行测试时我得到

AssertionError: expected {} to be a function

谁能帮助理解我的测试出了什么问题？

Answer 1

使用 mocha 和 chai async/await 风格：

import {expect} from "chai";

const test1 = async () => {
    throw new Error("I AM THE ERROR");
};

describe("My test case", async () => {
    it("should assert", async () => {

        try {
            await test1();
            expect(true, "promise should fail").eq(false)
        } catch (e) {
            expect(e.message).to.eq("I AM THE EXPECTED ERROR");
        }
    });
});

使用chai-as-promised：

import * as chai from "chai";
import * as chaiAsPromised from "chai-as-promised";

chai.use(chaiAsPromised);
const {expect} = chai;

const test1 = async () => {
    throw new Error("I AM THE ERROR");
};

describe("My test case", async () => {
    it("should assert", async () => {
        await expect(test1()).to.eventually.be.rejectedWith("I AM THE EXPECTED ERROR");
    });
});

使用chai-as-promised，您还可以返回期望承诺：

it("should assert", async () => {
    return expect(test1()).to.eventually.be.rejectedWith("I AM THE EXPECTED ERROR");
});

在每种情况下，您都应该收到一个测试错误，指出：

  1) My test case
       should assert:

      AssertionError: expected promise to be rejected with an error including 'I AM THE EXPECTED ERROR' but got 'I AM THE ERROR'      
      actual expected

      I AM THE EXPECTED ERROR