Fix Bowser constructor, add some tests

src/bowser.js

@@ -17,21 +17,22 @@ import Parser from './parser';
 class Bowser {
   /**
    * Creates an object that parses UA
-   * @param UA
+   * @param {String} UA — UserAgent string
+   * @param {Boolean} [skipParsing=false] — same as skipParsing for Parser
    *
    * @example
    * const bowser = new Bowser(window.navigator.userAgent);
    * bowser.getBrowser()
    */
-  constructor(UA) {
+  constructor(UA, skipParsing=false) {
     if (!UA) {
       throw new Error('UserAgent is not defined');
     }
-    return new Parser(UA);
+    return new Parser(UA, skipParsing);
   }
 
   static parse(UA) {
-    return (new this.constructor(UA)).getResult();
+    return (new Bowser(UA)).getResult();
   }
 
   /**

test/unit/bowser.js

@@ -0,0 +1,18 @@
+import test from 'ava';
+import Bowser from '../../src/bowser';
+import Parser from '../../src/parser';
+
+const UA = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36 OPR/43.0.2442.1165';
+const browser = new Bowser(UA);
+
+test('Bowser`s constructor returns a Parser instance', (t) => {
+  t.truthy(browser instanceof Parser);
+});
+
+test('Bowser`s constructor fails if UA is empty', (t) => {
+  t.throws(() => (new Bowser()));
+});
+
+test('Bowser.parse parses UA and returns result', (t) => {
+  t.deepEqual(Bowser.parse(UA), browser.getResult());
+});