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assert stream run the code, why ?

djedje
Posts: 20
Hello,
In a single module, i run 2 streams one to UpperCase the entries of the __dirname and a second reverse them. Running the program works fine.
In a separate file i run 2 tests (one for each transform stream), the tests pass BUT it run the program as well, i don t understand that ??
see the main file (running node myfile.js works)
const fs = require('fs') const { pipeline, Transform, Readable } = require('stream') const createUppercase = () => { return new Transform({ objectMode: true, transform(chunk, enc, next) { // console.log(chunk) next(null, chunk.name.toUpperCase()) } }) } const createReverse = () => { return new Transform({ objectMode: true, transform(chunk, enc, next) { // console.log(chunk) next(null, chunk.name.split("").reverse().join("")) } }) } module.exports = { createUppercase, createReverse } // upper case the dir entries const cu = createUppercase() fs.opendir(__dirname, (e,d) => { pipeline(d, cu, e => console.error("pipe error first: ", e)) }) cu.on('data', d => console.log(d)) // reverse the dir entries const cr = createReverse() fs.opendir(__dirname, (e,d) => { pipeline(d, cr, e => console.error("pipe error second: ", e)) }) cr.on('data', d => console.log(d))
see the tests file
const { pipeline, Readable } = require('stream') const assert = require('assert') const { createUppercase, createReverse } = require('./repeat') const test = createUppercase() const t = Readable.from([{name:'aaa'}, {name:'bbb'}]) t.pipe(test) test.once('data', d => { assert.equal(d, 'AAA') test.once('data', d => { assert.equal(d, 'BBB') console.log('test upper passed') }) }) const testR = createReverse() const rr = Readable.from([{name:'qwerty'}, {name: 'asdfgh'}]) rr.pipe(testR) testR.once('data', d => { assert.strictEqual(d, 'ytrewq') testR.once('data', d => { assert.strictEqual(d, 'hgfdsa') console.log('test reverse passed') }) })
running the test (node test.js) output the following
as you can see the tests pass, but the code is executed as well ..... ??? does someone have an idea why ? Thank you.
test upper passed test reverse passed TRY .GIT LABS REPEAT.JS CLIENT.JS COURS TEST.JS NODESHELLCMD.ODT yrt tig. sbal sj.taeper sj.tneilc sruoc sj.tset tdo.dmCllehSedon pipe error first: undefined pipe error second: undefined
0
Comments
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@djedje the tests are running your exported functions, but you're also running them in the module. So they're running twice.
1 -
@davidmarkclements, thank you.
0 -
@djedje np, glad it helped
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