title: protractor unable to click input='button' value
body: <p>I'm new to protractor and i was learning it and was struck in place.
  I'm having a form with submit as shown below.</p>
  
  <pre><code>&lt;input type="button" value="SIGN UP" class="btn btn-success btn-small" data-ng-click="ChceckMe()" /&gt;
  </code></pre>
  
  <p>I tried following ways but could not figure out </p>
  
  <pre><code>element(by.css('.btn-form')).click();
  element(by.css('.btn .btn-success .btn-sm .btn-form')).click();
  element(by.css('[ng-click="redirectRegister()"]')).click();
  element.getAttribute('LOGIN').submit();
  </code></pre>
  
  <p>All of them throws error.....please help me out and any help is much appreciated.Thanks in advance.</p>