text: // Receives an image LargestContentfulPaint |entry| and checks |entry|'s attribute values.
  // The |timeLowerBound| parameter is a lower bound on the loadTime value of the entry.
  // The |options| parameter may contain some string values specifying the following:
  // * 'renderTimeIs0': the renderTime should be 0 (image does not pass Timing-Allow-Origin checks).
  //     When not present, the renderTime should not be 0 (image passes the checks).
  // * 'sizeLowerBound': the |expectedSize| is only a lower bound on the size attribute value.
  //     When not present, |expectedSize| must be exactly equal to the size attribute value.
  function checkImage(entry, expectedUrl, expectedID, expectedSize, timeLowerBound, options = []) {
    assert_equals(entry.name, '');
    assert_equals(entry.entryType, 'largest-contentful-paint');
    assert_equals(entry.duration, 0);
    assert_equals(entry.url, expectedUrl);
    assert_equals(entry.id, expectedID);
    assert_equals(entry.element, document.getElementById(expectedID));
    if (options.includes('renderTimeIs0')) {
      assert_equals(entry.renderTime, 0, 'renderTime should be 0');
      assert_between_exclusive(entry.loadTime, timeLowerBound, performance.now(),
        'loadTime should be between the lower bound and the current time');
      assert_equals(entry.startTime, entry.loadTime, 'startTime should equal loadTime');
    } else {
      assert_between_exclusive(entry.loadTime, timeLowerBound, entry.renderTime,
        'loadTime should occur between the lower bound and the renderTime');
      assert_greater_than_equal(performance.now(), entry.renderTime,
        'renderTime should occur before the entry is dispatched to the observer.');
      assert_equals(entry.startTime, entry.renderTime, 'startTime should equal renderTime');
    }
    if (options.includes('sizeLowerBound')) {
      assert_greater_than(entry.size, expectedSize);
    } else {
      assert_equals(entry.size, expectedSize);
    }
  }