def test_evalf():
i = intervalles.conversion_chaine_ensemble(']-oo;-2]U[1/4;1/2[')
assert (str(i.evalf()) == ']-oo;-2.0]U[0.25;0.5[')
i = Intervalle(-sqrt(2), pi)
assert (str(i.evalf()) == '[-1.41421356237310;3.14159265358979]')
assert (str(i.evalf(n=3)) == '[-1.41;3.14]')
