def test_parameter_value():
t = Symbol("t")
p1, p2 = Point(0, 1), Point(5, 6)
l = Line(p1, p2)
assert l.parameter_value((5, 6), t) == {t: 1}
raises(ValueError, lambda: l.parameter_value((0, 0), t))
def test_parameter_value():
t = Symbol('t')
p1, p2 = Point(0, 1), Point(5, 6)
l = Line(p1, p2)
assert l.parameter_value((5, 6), t) == {t: 1}
raises(ValueError, lambda: l.parameter_value((0, 0), t))
