text: /*
   * Licensed to Elasticsearch B.V. under one or more contributor
   * license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright
   * ownership. Elasticsearch B.V. licenses this file to you 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.
   */
  
  import expect from 'expect.js';
  import * as exists from '../exists';
  import { nodeTypes } from '../../node_types';
  import _ from 'lodash';
  import indexPatternResponse from '../../../__fixtures__/index_pattern_response.json';
  
  
  let indexPattern;
  
  describe('kuery functions', function () {
    describe('exists', function () {
  
      beforeEach(() => {
        indexPattern = indexPatternResponse;
      });
  
      describe('buildNodeParams', function () {
        it('should return a single "arguments" param', function () {
          const result = exists.buildNodeParams('response');
          expect(result).to.only.have.key('arguments');
        });
  
        it('arguments should contain the provided fieldName as a literal', function () {
          const { arguments: [ arg ] } = exists.buildNodeParams('response');
          expect(arg).to.have.property('type', 'literal');
          expect(arg).to.have.property('value', 'response');
        });
      });
  
      describe('toElasticsearchQuery', function () {
        it('should return an ES exists query', function () {
          const expected = {
            exists: { field: 'response' }
          };
  
          const existsNode = nodeTypes.function.buildNode('exists', 'response');
          const result = exists.toElasticsearchQuery(existsNode, indexPattern);
          expect(_.isEqual(expected, result)).to.be(true);
        });
  
        it('should throw an error for scripted fields', function () {
          const existsNode = nodeTypes.function.buildNode('exists', 'script string');
          expect(exists.toElasticsearchQuery)
            .withArgs(existsNode, indexPattern).to.throwException(/Exists query does not support scripted fields/);
        });
  
      });
    });
  });
  