title: Wrapper reference is lost
body: <p>After these lines of code, i can access my wrappers and instances successfully:</p>
  
  <pre><code>containerDiv.style.width = '400px';
  global.document.body.appendChild(containerDiv);
  
  wrapper2 = mount(
      &lt;DocumentList 
          oid={'docOid251085'}/&gt;,
      {attachTo: containerDiv}
  );
  instance2 = wrapper2.component.getInstance();
  
  wrapper = mount(
      &lt;DocumentListRow 
          getDocumentListWidth={instance2.getDocumentListWidth}
          oid={'docOid251085'}
          record={record}/&gt;,
      {attachTo: document.getElementById('DocumentGriddocOid251085')}
  );
  instance = wrapper.component.getInstance();
  </code></pre>
  
  <p>But inside the next "it" blocks, i cannot access them, what is making me lose the wrappers and instances reference?</p>
  
  <pre><code>it("should render one row", function() {
      expect(wrapper.find('Row_1_' + 'docOid251085')).to.exist;
  });
  
  it("should render one row in a card that is normal", function() {
      var width;
  
      width = instance.props.getDocumentListWidth();
  
      expect(width).to.equal(400);
  });
  </code></pre>