Adding lib

package.json

@@ -16,7 +16,7 @@
     "coveralls": "npm run coverage && cat ./coverage/lcov.info | coveralls",
     "jest": "jest --colors --verbose",
     "lint": "eslint src/**/*.js test/**/*.js",
-    "start": "nodemon src/index.js",
+    "start": "nodemon sample/sample.js",
     "test": "npm run lint && npm run jest"
   },
   "repository": {

sample/sample.js

@@ -0,0 +1,7 @@
+/* eslint no-console: 0 */
+
+const lib = require('../src');
+
+lib.createHash('Buffer')
+  .then((hash) => console.log(hash))
+  .catch((err) => console.error(err));

src/index.js

@@ -1,5 +1,19 @@
-'use strict';
+const crypto = require('crypto');
 
-module.exports.hello = (done) => {
-  return done(null, 'It works!');
+module.exports.createHash = (buffer) => {
+  return new Promise((resolve, reject) => {
+    if (!buffer) reject('Buffer not found');
+
+    const md5 = crypto.createHash('md5').update(buffer).digest('hex');
+    const sha1 = crypto.createHash('sha1').update(buffer).digest('hex');
+    const sha256 = crypto.createHash('sha256').update(buffer).digest('hex');
+
+    const hash = {
+      md5,
+      sha1,
+      sha256
+    };
+
+    resolve(hash);
+  });
 };

test/test.js

@@ -4,13 +4,31 @@ const lib = require('../src');
 
 describe('TESTS', () => {
 
-  test('Basic test', (done) => {
-    lib.hello((err, message) => {
-      expect(err).toBeNull();
-      expect(message).toBe('It works!');
+  test('should return an error', (done) => {
+    lib.createHash('')
+      .catch((err) => {
+        expect(err).toBeDefined();
+        expect(err).toBe('Buffer not found');
 
-      done();
-    });
+        done();
+      });
+  });
+
+  test('should return a hash', (done) => {
+    lib.createHash('Buffer')
+      .then((hash) => {
+        expect(hash).toBeDefined();
+
+        expect(hash.md5).toBeDefined();
+        expect(hash.sha1).toBeDefined();
+        expect(hash.sha256).toBeDefined();
+
+        expect(hash.md5).toBe('7e62bc342f41c946868f0ea6f0b712d8');
+        expect(hash.sha1).toBe('2be5f64b36230104ef9c6e230215846a83d18df6');
+        expect(hash.sha256).toBe('e44193fd2d21722a46c8fcab041508d4c5be95a34828b72c631df53e8d7e20a6');
+
+        done();
+      });
   });
 
 });