def test_timeintervaltools_TimeInterval_shift_to_rational_01():
    r'''TimeInterval.shift_to_rational returns a new TimeInterval instance
    unless offset is old start_offset offset.
    '''

    i1 = TimeInterval(3, 23)
    i2 = i1.shift_to_rational(-1000)
    assert i1 != i2
    i2 = i1.shift_to_rational(3)
    assert i1 == i2
def test_timeintervaltools_TimeInterval_shift_to_rational_03():
    r'''TimeIntervals can be shifted by Fractions.
    '''

    i1 = TimeInterval(3, 23)
    i2 = i1.shift_to_rational(Fraction(-51, 3))
    assert i2.start_offset == Fraction(-51, 3)
    assert i2.duration == i1.duration
def test_timeintervaltools_TimeInterval_shift_to_rational_02():
    r'''TimeIntervals can be shifted by ints.
    '''

    i1 = TimeInterval(3, 23)
    i2 = i1.shift_to_rational(-1)
    assert i2.start_offset == -1
    assert i2.duration == i1.duration