helpers.segment.tests.js

const {_boundSegment} = Chart.helpers;

describe('helpers.segments', function() {
  describe('_boundSegment', function() {
    const points = [{x: 10, y: 1}, {x: 20, y: 2}, {x: 30, y: 3}];
    const segment = {start: 0, end: 2, loop: false};

    it('should not find segment from before the line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 5, end: 9.99999})).toEqual([]);
    });

    it('should not find segment from after the line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 30.00001, end: 800})).toEqual([]);
    });

    it('should find segment when starting before line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 5, end: 15})).toEqual([{start: 0, end: 1, loop: false}]);
    });

    it('should find segment directly on point', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 10, end: 10})).toEqual([{start: 0, end: 0, loop: false}]);
    });

    it('should find segment from range between points', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 11, end: 14})).toEqual([{start: 0, end: 1, loop: false}]);
    });

    it('should find segment from point between points', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 22, end: 22})).toEqual([{start: 1, end: 2, loop: false}]);
    });

    it('should find whole segment', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 0, end: 50})).toEqual([{start: 0, end: 2, loop: false}]);
    });

    it('should find correct segment from near points', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 10.001, end: 29.999})).toEqual([{start: 0, end: 2, loop: false}]);
    });

    it('should find segment from after the line', function() {
      expect(_boundSegment(segment, points, {property: 'x', start: 25, end: 35})).toEqual([{start: 1, end: 2, loop: false}]);
    });

    it('should find multiple segments', function() {
      const points2 = [{x: 0, y: 100}, {x: 1, y: 50}, {x: 2, y: 70}, {x: 4, y: 80}, {x: 5, y: -100}];
      expect(_boundSegment({start: 0, end: 4, loop: false}, points2, {property: 'y', start: 60, end: 60})).toEqual([
        {start: 0, end: 1, loop: false},
        {start: 1, end: 2, loop: false},
        {start: 3, end: 4, loop: false},
      ]);
    });
  });
});