func TestCombineZeroOrOne(t *testing.T) {
r := intRecurring(5)
if recurring.Combine() != recurring.Nil() {
t.Error("Expect combining no recurrings to be nil recurring.")
}
if recurring.Combine(r) != r {
t.Error("Expected combine of single recurring to be that recurring.")
}
}
func TestCombine2(t *testing.T) {
r := recurring.Combine(recurring.Nil(), recurring.Nil())
verifyTimes(
t,
r.ForTime(kNow))
}