feat(Testing): Add unit tests with Mocha

.babelrc

@@ -1,8 +1,8 @@
 {
   "presets": [
-    ["es2015", { "modules": false }]
+    ["env", { "modules": false }]
   ],
   "plugins": [
-    "external-helpers"
+    // "external-helpers"
   ]
 }

config.json

@@ -0,0 +1,3 @@
+{
+  "testEnvironment": "node"
+}

dist/test.js

@@ -0,0 +1,70 @@
+'use strict';
+
+var _vueE = require('./vue-e164.js');
+
+var assert = require('assert');
+
+var tests = [{
+  plus: true,
+  brackets: true,
+  space: true,
+  answer: '+7 (999) 975 70 65',
+  pattern: '+ () _'
+}, {
+  plus: false,
+  brackets: false,
+  space: false,
+  answer: '79999757065',
+  pattern: 'all options false'
+}, {
+  plus: true,
+  brackets: false,
+  space: false,
+  answer: '+79999757065',
+  pattern: '+'
+}, {
+  plus: true,
+  brackets: true,
+  space: false,
+  answer: '+7(999)9757065',
+  pattern: '+ ()'
+}, {
+  plus: false,
+  brackets: true,
+  space: true,
+  answer: '7 (999) 975 70 65',
+  pattern: '() _'
+}, {
+  plus: false,
+  brackets: false,
+  space: true,
+  answer: '7 999 975 70 65',
+  pattern: '_'
+}, {
+  plus: false,
+  brackets: true,
+  space: false,
+  answer: '7(999)9757065',
+  pattern: '()'
+}, {
+  plus: true,
+  brackets: false,
+  space: true,
+  answer: '+7 999 975 70 65',
+  pattern: '+ _'
+}];
+
+describe('Using different options', function () {
+  tests.forEach(function (item) {
+    it('Should return value in correct pattern: ' + item.pattern, function () {
+      assert.equal((0, _vueE.filter)('79999757065', item), item.answer);
+    });
+  });
+  it('Should return empty string for empty string', function () {
+    assert.equal((0, _vueE.filter)('', {
+      plus: true,
+      brackets: false,
+      space: true
+    }), '');
+  });
+});