import { assert, UnitTest } from '@ephox/bedrock';
import * as Boundaries from 'ephox/polaris/array/Boundaries';

UnitTest.test('BoundariesTest', function () {
  const comparator = function (a: string, b: string) {
    return a === b;
  };

  const check = function (items: string[], l: string, r: string, pred: (a: string, b: string) => boolean, expected: string[]) {
    assert.eq(Boundaries.boundAt(items, l, r, pred), expected);
  };

  check(['a', 'b', 'c', 'd', 'e'], 'b', 'd', comparator, ['b', 'c', 'd']);
  check(['a', 'b', 'c', 'd', 'e'], 'a', 'e', comparator, ['a', 'b', 'c', 'd', 'e']);
  check(['a'], 'a', 'a', comparator, ['a']);
  check([], '1', '3', comparator, []);
  check(['a', 'b', 'c'], 'd', 'e', comparator, ['a', 'b', 'c']);
  check(['a', 'b', 'c'], 'd', 'b', comparator, ['a', 'b']);
  check(['a', 'b', 'c'], 'b', 'g', comparator, ['b', 'c']);
  check(['a', 'b', 'c'], 'b', 'b', comparator, ['b']);
});