def test_uniform():
U = Uniform(-3, -1)
assert str(U) == "Uniform(-3, -1)"
assert repr(U) == "Uniform(-3, -1)"
x = U.random()
assert x < -1 and x > -3
assert U.mean == -2
assert U.confidence(1) == (-3, -1)
assert U.confidence(Rational(1,2)) == (Rational(-5,2), Rational(-3,2))
assert U.pdf(-4) == 0
assert U.pdf(-Rational(3,2)) == Rational(1,2)
assert U.pdf(0) == 0
assert U.cdf(-4) == 0
assert U.cdf(-Rational(3,2)) == Rational(3,4)
assert U.cdf(0) == 1
