How to click on button with no text in Protractor ?
<p><a href="http://angular.github.io/peepcode-tunes/public/" rel="nofollow">I want to Click on the two Plus(+) button but the button is not having any text in Music Library Section </a></p>

<p>How to Click the same?</p>

<p>I tried the following code:</p>

<pre><code>describe ('angularjs homepage', function() {
    browser.get('http://angular.github.io/peepcode-tunes/public/');
    element(by.css('[ng-click="player.playlist.add(album)"]')).click();
});
</code></pre>

<p>Unfortunately It is not working.
Please Help</p>