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async.js
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async.js
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import { expect, assert } from 'chai';
import 'babel-polyfill';
import fs from 'fs';
describe('async function', function() {
it('test async', function(done) {
async function readTwoFiles() {
let firstData = await new Promise(function(resolve,reject){// await and promise
fs.readFile(__dirname + '/test.txt',function(error,buffer){
resolve(buffer.toString());
});
});
expect(firstData).to.equal('test');
let secondData = await new Promise(function(resolve,reject){
fs.readFile(__dirname + '/another.txt',function(error,buffer){
resolve(buffer.toString());
});
});
expect(secondData).to.equal('another');
done();
}
readTwoFiles();
});
it('promise instance',function(){
async function testPromise(){
return 1;
}
let asyncPromise = testPromise();
expect(asyncPromise instanceof Promise ).to.equal(true);
});
it('test then',function(){
async function testPromise(){
return 1;
}
return testPromise().then(function(data){
expect(data).to.equal(1);
});
});
it('test await',function(){
async function testPromise(){
return await function(){}
}
return testPromise().then(function(data){
expect(typeof data).to.equal('function')
});
});
});