Unit test with mocha + chai always passed

问题

I try to use 'mocha' and 'chai' for my unit test but I have a problem with the test result, it always passed. Please take a look.

UnitTest.spec.ts

import PostgresService from "../src/Services/PostgresService"
import {expect} from "chai"
import 'mocha'

describe('Postgres Override Test function', () => {
    it('should return any number but not zero', async () => {
        let client = new PostgresService();
        let result = await client.getLatestCMD("Servo");   
        try{
            console.log("Type : " + typeof(result));
            console.log("Value : " + result.rows[0].id);
            expect(result.rows[0].id).to.equal(0)        
        }catch(error){

        }
    })
})

回答1:

Remove the try catch block to actually run your expect function.

If your try block returns an error the JavaScript interpreter moves on to the catch block and so the former is never run.

回答2:

When you use ASYNCHRONOUS CODE, you need done in the callback

example

You need to declare done as an argument to it.

it('description', (done) => {
    expect((err, result) => {
    if (err) done(err);
    else done();
 })
})

来源：https://stackoverflow.com/questions/47111489/unit-test-with-mocha-chai-always-passed