function assertColorFuzzyEquals(str, expected, actual, delta) {
  assertTrue(
      `${str} Expected: ${expected}  and got: ${actual} w/ delta: ` + delta,
      (Math.abs(expected[0] - actual[0]) <= delta) &&
          (Math.abs(expected[1] - actual[1]) <= delta) &&
          (Math.abs(expected[2] - actual[2]) <= delta));
}
Checks equivalence between two colors' respective values.  Accepts +- delta
for each pair of values
@param {string} str
@param {Array<number>} expected
@param {Array<number>} actual
@param {number} delta Margin of error for each element in color array