Function expectOverlapping

src/cdk/scrolling/scrollable.spec.ts:6–20

(el1: ElementRef<Element>, el2: ElementRef<Element>, expected = true)

import {ComponentFixture, TestBed} from '@angular/core/testing';

function expectOverlapping(el1: ElementRef<Element>, el2: ElementRef<Element>, expected = true) {
  const r1 = el1.nativeElement.getBoundingClientRect();
  const r2 = el2.nativeElement.getBoundingClientRect();
  const actual =
    r1.left < r2.right && r1.right > r2.left && r1.top < r2.bottom && r1.bottom > r2.top;
  if (expected) {
    expect(actual)
      .withContext(`${JSON.stringify(r1)} should overlap with ${JSON.stringify(r2)}`)
      .toBe(expected);
  } else {
    expect(actual)
      .withContext(`${JSON.stringify(r1)} should not overlap with ${JSON.stringify(r2)}`)
      .toBe(expected);
  }
}

describe('CdkScrollable', () => {
  let fixture: ComponentFixture<ScrollableViewport>;