I think this shouldn't pass:

```js
    expect(() => {
      expect(() => {
        throw new Error('haha') // no warning
      }).toWarnDev(
        'nope',
      );
    }).toThrow('haha');
```

but it does.
static defaultProps = {prop: 'testKey'};
      render() {
        return <span />;
      }
    }
    const inputProps = {};
    let instance1 = <Component {...inputProps} />;
    instance1 = ReactTestUtils.renderIntoDocument(instance1);
    expect(instance1.props.prop).toBe('testKey');
    
    
    expect(inputProps.prop).not.toBeDefined();
  });
  it('should warn about `forceUpdate` on not-yet-mounted components', () => {
    class MyComponent extends React.Component {