def test_avg_empty_list():
c = Calc()
res = c.avg([])
assert res == 0
def test_avg_upper_threshold_is_included():
c = Calc()
res = c.avg([2, 5, 12, 98], ut=98, lt=2)
assert res == 29.25
def test_avg_removes_lower_outiers():
c = Calc()
res = c.avg([2, 5, 12, 98], lt=10)
assert res == pytest.approx(55)
def test_avg_removes_upper_outiers():
c = Calc()
res = c.avg([2, 5, 12, 98], ut=90)
assert res == pytest.approx(6.33333)
def test_avg_correct_average():
c = Calc()
res = c.avg([2, 5, 12, 98])
assert res == 29.25
def test_avg_manages_empty_list_before_outlier_removal():
c = Calc()
res = c.avg([], lt=15, ut=90)
assert res == 0