getComputedStyleX is not a function

[nirradi]

I'm unit testing a component of mine that uses antd dropdown.
I get this error when trying to use enzyme to mount the component and then simulate a click on that drop down.

The above error occurred in the <Align> component:
    in Align (created by Popup)
    in AnimateChild (created by Animate)
    in Animate (created by Popup)
    in div (created by Popup)
    in Popup (created by Trigger)
    in Portal (created by Trigger)
    in Trigger (created by Dropdown)
    in Dropdown (created by Dropdown)
 TypeError: getComputedStyleX is not a function
          at getWH (node_modules/dom-align/lib/utils.js:434:23)
          at HTMLAnchorElement.<anonymous> (node_modules/dom-align/lib/utils.js:486:19)
          at swap (node_modules/dom-align/lib/utils.js:359:12)
          at getWHIgnoreDisplay (node_modules/dom-align/lib/utils.js:485:5)
          at Object.domUtils.(anonymous function) [as outerWidth] (node_modules/dom- 
   align/lib/utils.js:495:18)
          at getRegion (node_modules/dom-align/lib/getRegion.js:19:28)
          at alignElement (node_modules/dom-align/lib/align/alignElement.js:34:50)
          at Align._this.forceAlign (node_modules/rc-align/lib/Align.js:76:47)
          at Align.componentDidMount (node_modules/rc-align/lib/Align.js:91:10)
         at commitLifeCycles (node_modules/react-dom/cjs/react-dom.development.js:14362:22)

I definitely do have a window defined.

        console.log(".....", window.getComputedStyle);
        let wrapper = mount(<UserMenu />);
        wrapper.find(Dropdown).simulate('click')