message: on mount, add mui theme signaling use of next typography variants
diff: +import createMuiTheme from '@material-ui/core/styles/createMuiTheme';
  import * as enzyme from 'enzyme';
  import * as React from 'react';
  import { WithUtilsProps } from '../_shared/WithUtils';
  -import { MaterialUiPickersDate } from '../typings/date';
  -import { Utils } from '../typings/utils';
  import DateFnsUtils from '../utils/date-fns-utils';
  import LuxonUtils from '../utils/luxon-utils';
  import MomentUtils from '../utils/moment-utils';
  import MuiPickersUtilsProvider from '../utils/MuiPickersUtilsProvider';
  +import MuiThemeProvider from '@material-ui/core/styles/MuiThemeProvider';
  +
  +const theme = createMuiTheme({
  + typography: {
  + useNextVariants: true,
  + },
  +});
  const getUtilClass = () => {
  switch (process.env.UTILS) {
  @@ -51,7 +57,7 @@ export const mount = <P extends WithUtilsProps>(
  ) =>
  enzyme.mount(
  <MuiPickersUtilsProvider utils={UtilClassToUse}>
  - {element}
  + <MuiThemeProvider theme={theme}>{element}</MuiThemeProvider>
  </MuiPickersUtilsProvider>
  );
  