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Dir : ~/usr/share/grafana/public/app/core/utils/

Edit File: query.test.ts

import { DataQuery } from '@grafana/data';

import { getNextRefIdChar, queryIsEmpty } from './query';

export interface TestQuery extends DataQuery {
  name?: string;
}

function dataQueryHelper(ids: string[]): DataQuery[] {
  return ids.map((letter) => {
    return { refId: letter };
  });
}

const singleDataQuery: DataQuery[] = dataQueryHelper('ABCDE'.split(''));
const outOfOrderDataQuery: DataQuery[] = dataQueryHelper('ABD'.split(''));
const singleExtendedDataQuery: DataQuery[] = dataQueryHelper('ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split(''));

describe('Get next refId char', () => {
  it('should return next char', () => {
    expect(getNextRefIdChar(singleDataQuery)).toEqual('F');
  });

it('should get first char', () => {
    expect(getNextRefIdChar([])).toEqual('A');
  });

it('should get the first available character if a query has been deleted out of order', () => {
    expect(getNextRefIdChar(outOfOrderDataQuery)).toEqual('C');
  });

it('should append a new char and start from AA when Z is reached', () => {
    expect(getNextRefIdChar(singleExtendedDataQuery)).toEqual('AA');
  });
});

describe('queryIsEmpty', () => {
  it('should return true if query only includes props that are defined in the DataQuery interface', () => {
    const testQuery: DataQuery = { refId: 'A' };
    expect(queryIsEmpty(testQuery)).toEqual(true);
  });

it('should return true if query only includes props that are defined in the DataQuery interface and a label prop', () => {
    const testQuery: DataQuery & { label: string } = { refId: 'A', label: '' };
    expect(queryIsEmpty(testQuery)).toEqual(true);
  });

it('should return false if query only includes props that are not defined in the DataQuery interface', () => {
    const testQuery: TestQuery = { refId: 'A', name: 'test' };
    expect(queryIsEmpty(testQuery)).toEqual(false);
  });
});