grafana/public/app/plugins/datasource/graphite/specs/graphite_query.test.ts

import gfunc from '../gfunc';
import GraphiteQuery from '../graphite_query';

describe('Graphite query model', () => {
  const ctx: any = {
    datasource: {
      getFuncDef: gfunc.getFuncDef,
      getFuncDefs: jest.fn().mockReturnValue(Promise.resolve(gfunc.getFuncDefs('1.0'))),
      waitForFuncDefsLoaded: jest.fn().mockReturnValue(Promise.resolve(null)),
      createFuncInstance: gfunc.createFuncInstance,
    },
    templateSrv: {},
    targets: [],
  };

  beforeEach(() => {
    ctx.target = { refId: 'A', target: 'scaleToSeconds(#A, 60)' };
    ctx.queryModel = new GraphiteQuery(ctx.datasource, ctx.target, ctx.templateSrv);
  });

  describe('when updating targets with nested queries', () => {
    beforeEach(() => {
      ctx.target = { refId: 'D', target: 'asPercent(#A, #C)' };
      ctx.targets = [
        { refId: 'A', target: 'first.query.count' },
        { refId: 'B', target: 'second.query.count' },
        { refId: 'C', target: 'diffSeries(#A, #B)' },
        { refId: 'D', target: 'asPercent(#A, #C)' },
      ];
      ctx.queryModel = new GraphiteQuery(ctx.datasource, ctx.target, ctx.templateSrv);
    });

    it('targetFull should include nested queries', () => {
      ctx.queryModel.updateRenderedTarget(ctx.target, ctx.targets);
      const targetFullExpected = 'asPercent(first.query.count, diffSeries(first.query.count, second.query.count))';
      expect(ctx.queryModel.target.targetFull).toBe(targetFullExpected);
    });

    it('should not hang on circular references', () => {
      ctx.target.target = 'asPercent(#A, #B)';
      ctx.targets = [{ refId: 'A', target: 'asPercent(#B, #C)' }, { refId: 'B', target: 'asPercent(#A, #C)' }];
      ctx.queryModel.updateRenderedTarget(ctx.target, ctx.targets);
      // Just ensure updateRenderedTarget() is completed and doesn't hang
      expect(ctx.queryModel.target.targetFull).toBeDefined();
    });
  });
});