TBBle commented on issue #6575: TypeError: Cannot set property 'font' of null at Object.measureText (node_modules/zrender/lib/contain/text.js:371:18) URL: https://github.com/apache/incubator-echarts/issues/6575#issuecomment-386181504 Turns out it's hitting this in jsdom's [HTMLCanvasElement-impl.js](https://github.com/jsdom/jsdom/blob/master/lib/jsdom/living/nodes/HTMLCanvasElement-impl.js#L42) ```js notImplemented( "HTMLCanvasElement.prototype.getContext (without installing the canvas npm package)", this._ownerDocument._defaultView ); ``` See https://github.com/facebook/jest/issues/5168 For some reason, the `notImplemented` failure doesn't bubble up or output anywhere, so this wasn't reported in the output logs. The solution is to install something like [canvas](http://npmjs.com/package/canvas), [canvas-prebuilt](https://www.npmjs.com/package/canvas-prebuilt) or [jest-canvas-mock](https://www.npmjs.com/package/jest-canvas-mock). That last option needs to be (simply) integrated into your project.
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