simulate for onClick not working in enzyme : <p>This is a cancel button</p>

<pre><code>&lt;div className="cancelFileBtn" onClick={this.props.cancelFileSending}&gt;
</code></pre>

<p>I need to simulate its click,I tried the following test </p>

<pre><code>wrapper.find('.cancelFileBtn').simulate('click');
</code></pre>

<p>But the click function is still undefined...Did I miss anything else? 
and it will be very helpful if anyone can mention any changes if exist in simulating</p>

<pre><code>&lt;SendMessageButton onClick={this.props.handleClickSendMessage} loadingFile={this.props.loadingFile}/&gt;
</code></pre>
