Mocha Typescript测试不打印Console.log

问题在于这段代码:

lineReader.on('line', function (line) {
    testFile.push(line);
});
done();

您的ReadLine阅读器是异步工作的。附加一个侦听器,在读取任何行之前, done()

要修复它,请等待读卡器关闭:

import chai = require('chai');
import chaiAsPromised = require('chai-as-promised');
import ReadLine = require('readline');
import FS = require('fs');

before((done) => {
    chai.should();
    chai.use(chaiAsPromised);
    done();
});


describe("Test", function() {
    this.timeout(20000);
    let testFile: string [] = [];

    before((done) => {
        let lineReader = ReadLine.createInterface({
            input: FS.createReadStream("MyFile.txt")
        });

        lineReader.on('line', function (line) {
            testFile.push(line);
        });
        linereader.on('close', () => done()); // <===== 
    });
    it("test", () => {
        for(let i=0;i<testFile.length;i++){
            let curLine = testFile[i];
            console.log(curLine);
        }
    }).timeout(30000);
});

您需要在for循环之后使用done():

it("test", (done) => {
    for(let i=0;i<testFile.length;i++){
        let curLine = testFile[i];
        console.log(curLine);
    }

  done();
}).timeout(30000);