text: /*
   * Copyright 2016 hudl
   * All rights reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   * @providesModule single
   * @flow
   *
   * This ensures a matcher can only be called with a single enzymeWrapper
   */
  
  import type { EnzymeObject } from '../types';
  
  export default function single (matcherFn: Function) {
    return function singleWrapper (
      enzymeWrapper: EnzymeObject,
      ...args: Array<any>
    ) {
      let message;
      switch (enzymeWrapper.getElements().length) {
        case 0:
          message = `${matcherFn.name} must be called on a single node, not an empty node.`;
          break;
        case 1:
          break;
        default:
          message = `${matcherFn.name} must be called on a single node, not multiple nodes.`;
      }
  
      if (message) {
        return {
          pass: false,
          message,
          negatedMessage: message,
          contextualInformation: {},
        };
      }
  
      // Preserve utilities set inside this for the matchers
      return matcherFn.call(this, enzymeWrapper, ...args); // eslint-disable-line prefer-reflect
    };
  }
  