file process

lab-khalid/.eslintrc

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+{
+  "rules": {
+    "no-console": "off",
+    "indent": [ "error", 2 ],
+    "quotes": [ "error", "single" ],
+    "semi": ["error", "always"],
+    "linebreak-style": [ "error", "unix" ]
+  },
+  "env": {
+    "es6": true,
+    "node": true,
+    "mocha": true,
+    "jasmine": true
+  },
+  "ecmaFeatures": {
+    "modules": true,
+    "experimentalObjectRestSpread": true,
+    "impliedStrict": true
+  },
+  "extends": "eslint:recommended"
+}

lab-khalid/.gitignore

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+# Created by https://www.gitignore.io/api/node,vim,macos,linux,windows
+
+node_modules/
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules
+jspm_packages
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+
+
+### Vim ###
+# swap
+[._]*.s[a-w][a-z]
+[._]s[a-w][a-z]
+# session
+Session.vim
+# temporary
+.netrwhist
+*~
+# auto-generated tag files
+tags
+
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+# Thumbnails
+._*
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+
+### Linux ###
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+
+### Windows ###
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk

lab-khalid/data/one.txt

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+The words in the one file

lab-khalid/data/three.txt

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+The words in the three file

lab-khalid/data/two.txt

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+The words in the two file

lab-khalid/lib/read-file.js

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+'use strict';
+
+const fs = require('fs');
+
+const readFile = module.exports = function(file, callback) {
+  fs.readFile(file, function(err, data) {
+    if(err) throw callback(err);
+    console.log(data.toString('hex', 0, 8));
+    return callback(null, data.toString());
+  });
+};

lab-khalid/package.json

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+{
+  "name": "lab-khalid",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "directories": {
+    "test": "test"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "chai": "^3.5.0",
+    "mocha": "^3.2.0"
+  }
+}

lab-khalid/test/data-test.js

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+'use strict';
+
+const expect = require('chai').expect;
+const readFile = require('../lib/read-file.js');
+
+describe('Reading the data files', function(){
+
+  describe('inproper file path', function(){
+    it('should return an error', function(done) {
+      readFile(`${__dirname}/fake-file.txt`, function(err){
+        expect(err).to.be.an('error');
+        done();
+      });
+    });
+  });
+
+  describe('one.txt', function() {
+    it('should return content from one.txt', function(done) {
+      readFile(`${__dirname}/../data/one.txt`, function(err, data) {
+        expect(err).to.equal(null);
+        expect(data).to.be.a('string');
+        expect(data).to.be.equal('The words in the one file\n')
+        done();
+      });
+    });
+  });
+
+  describe('two.txt', function(){
+    it('should return content from two.txt', function(done){
+      readFile(`${__dirname}/../data/two.txt`, function(err, data){
+        expect(err).to.equal(null);
+        expect(data).to.be.a('string');
+        expect(data).to.be.equal('The words in the two file\n')
+        done();
+      });
+    });
+  });
+
+  describe('three.txt', function() {
+    it('should return the content from three.txt', function(done){
+      readFile(`${__dirname}/../data/three.txt`, function(err, data){
+        expect(err).to.equal(null);
+        expect(data).to.be.a('string');
+        expect(data).to.be.equal('The words in the three file\n')
+        done();
+      });
+    });
+  });
+
+});