// modification time plus the number of transition/restore days.
//
//	e.g. If the object modtime is `Thu May 21 13:42:50 GMT 2020` and the object should
//	    transition in 1 day, then the expected transition time is `Fri, 23 May 2020 00:00:00 GMT`
func ExpectedExpiryTime(modTime time.Time, days int) time.Time {
	if days == 0 {
		return modTime
	}

    assertThat(taskFaker.executeCallCount).isEqualTo(2)

    // At 200.µs, the blue task runs.
    taskFaker.advanceUntil(200.µs)
    assertThat(log).containsExactly("red:run@100000", "blue:run@200000")
    assertThat(taskFaker.executeCallCount).isEqualTo(2)

    taskFaker.assertNoMoreTasks()
  }

  private val Int.µs: Long
    get() = this * 1_000L

binary_digits  = binary_digit { [ "_" ] binary_digit } .
octal_digits   = octal_digit { [ "_" ] octal_digit } .
hex_digits     = hex_digit { [ "_" ] hex_digit } .
</pre>

<pre>
42
4_2
0600
0_600
0o600
0O600       // second character is capital letter 'O'
0xBadFace
0xBad_Face
0x_67_7a_2f_cc_40_c6
170141183460469231731687303715884105727
170_141183_460469_231731_687303_715884_105727