grafana/public/app/features/variables/shared/testing/multiVariableBuilder.ts

import { VariableWithMultiSupport } from 'app/features/templating/types';
import { OptionsVariableBuilder } from './optionsVariableBuilder';

export class MultiVariableBuilder<T extends VariableWithMultiSupport> extends OptionsVariableBuilder<T> {
  withMulti(multi = true) {
    this.variable.multi = multi;
    return this;
  }
}