node.js - Writing unit tests with jest for javascript minifier -


i'm new writing unit tests. need testing javascript minifier. i'm using jest test.

jsminifier:

const compressor = require('node-minify'); const dirsearch = require('directory-search'); const scrapeconfig = require('../scraper.config.js');  function jsoptimizer() {   dirsearch(scrapeconfig.directory, '.js', (err, files) => {     files.foreach(file => {       compressor         .minify({           compressor: 'uglifyjs',           input: file,           output: file,         })         .catch(error => console.log(error));     });   }); }  module.exports = jsoptimizer;

how go testing 100% conceptual coverage? if can provide example, appreciated.

so far have code(incomplete). trying load file variable , make sure minified file equal or less unminified code. 

const dirsearch = require('directory-search'); const fs = require('fs'); const scrapeconfig = require('../scraper.config.js'); const jsoptimizer = require('../src/jsoptimizer.js');  test('throws error if minified code greater unminified code', ()  => { dirsearch(scrapeconfig.directory, '.js', (err, files) => {   files.foreach(file => {     });   if (err) throw err;   console.log(files); });   jsoptimizer(); });


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