Make `test` fast again.
Make `test` fast again.

Undo changes from https://github.com/vega/vega-lite/commit/fe88c2478d407ee2c5b85d01c248c83091c96e2e#commitcomment-22500384

uwdata/vega-lite,vega/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite