public void doingAnOrWithANeverValidTimeLineProducesTheSameTimeLine() {
AvailabilityTimeLine timeLine = AvailabilityTimeLine.allValid();
timeLine.invalidAt(earlyExample, contemporaryExample);
timeLine.invalidAt(lateExample, lateExample.plusDays(20));
AvailabilityTimeLine another = AvailabilityTimeLine.allValid();
another.allInvalid();
AvailabilityTimeLine result = timeLine.and(another);
assertThat(result.getValidPeriods(), definedBy(StartOfTime.create(),
point(earlyExample), point(contemporaryExample),