function assertIncEquals(toIncrement, expectedResult) {
  const counter = googCrypt.hexToByteArray(toIncrement);
  Ctr.incrementBigEndianCounter_(counter);
  assertEquals(expectedResult, googCrypt.byteArrayToHex(counter));
}
Asserts Ctr.incrementBigEndianCounter turns the first parameter
into the second.
@param {string} toIncrement
@param {string} expectedResult
@suppress {visibility} suppression added to enable type checking