energylink/public/app/plugins/panel/graph/specs/histogram_specs.ts

///<reference path="../../../../headers/common.d.ts" />
import _ from 'lodash';
import { describe, beforeEach, it, expect } from '../../../../../test/lib/common';
import { convertValuesToHistogram, getSeriesValues } from '../histogram';

describe('Graph Histogam Converter', function () {

  describe('Values to histogram converter', () => {
    let values;
    let bucketSize = 10;

    beforeEach(() => {
      values = [1, 2, 10, 11, 17, 20, 29, 30, 31, 33];
    });

    it('Should convert to series-like array', () => {
      bucketSize = 10;
      let expected = [
        [0, 2], [10, 3], [20, 2], [30, 3]
      ];

      let histogram = convertValuesToHistogram(values, bucketSize);
      expect(histogram).to.eql(expected);
    });

    it('Should not add empty buckets', () => {
      bucketSize = 5;
      let expected = [
        [0, 2], [10, 2], [15, 1], [20, 1], [25, 1], [30, 3]
      ];

      let histogram = convertValuesToHistogram(values, bucketSize);
      expect(histogram).to.eql(expected);
    });

    it('Should normalize values', () => {
      bucketSize = 5;
      let normalize = true;
      let expected = [
        [0, 0.2], [10, 0.2], [15, 0.1], [20, 0.1], [25, 0.1], [30, 0.3]
      ];

      let histogram = convertValuesToHistogram(values, bucketSize, normalize);
      expect(histogram).to.eql(expected);
    });

    it('Sum of normalized values should be 1', () => {
      bucketSize = 5;
      let normalize = true;
      let expected = [
        [0, 0.2], [10, 0.2], [15, 0.1], [20, 0.1], [25, 0.1], [30, 0.3]
      ];

      let histogram = convertValuesToHistogram(values, bucketSize, normalize);
      let sum = _.reduce(histogram, (sum, point) => sum + point[1], 0);
      expect(sum).to.eql(1);
    });
  });

  describe('Series to values converter', () => {
    let data;

    beforeEach(() => {
      data = [
        {
          data: [[0, 1], [0, 2], [0, 10], [0, 11], [0, 17], [0, 20], [0, 29]]
        }
      ];
    });

    it('Should convert to values array', () => {
      let expected = [1, 2, 10, 11, 17, 20, 29];

      let values = getSeriesValues(data);
      expect(values).to.eql(expected);
    });

    it('Should skip null values', () => {
      data[0].data.push([0, null]);

      let expected = [1, 2, 10, 11, 17, 20, 29];

      let values = getSeriesValues(data);
      expect(values).to.eql(expected);
    });
  });
});