ember-tooltips/addon-test-support/dom/assertions/assert-tooltip-side.js

import { getPositionDifferences } from 'ember-tooltips/test-support/dom';
import { validateSide } from 'ember-tooltips/test-support/utils';

export default function assertTooltipSide(assert, options = {}) {
  const { side } = options;

  validateSide(side);

  const { expectedGreaterDistance, expectedLesserDistance } = getPositionDifferences(options);

  /* When the side is top or left, the greater number
  is the target's position. Thus, we check that the
  target's position is greater than the tooltip's
  position. */

  assert.ok(expectedGreaterDistance > expectedLesserDistance,
    `Tooltip should be on the ${side} side of the target`);
}