# This testfile tests SymPy <-> SciPy compatibility

# Don't test any SymPy features here. Just pure interaction with SciPy.
# Always write regular SymPy tests for anything, that can be tested in pure
# Python (without scipy). Here we test everything, that a user may need when
# using SymPy with SciPy

from sympy.external import import_module

scipy = import_module('scipy')
if not scipy:
    #bin/test will not execute any tests now
    disabled = True

from sympy.functions.special.bessel import jn_zeros


def eq(a, b, tol=1e-6):
    for x, y in zip(a, b):
        if not (abs(x - y) < tol):
            return False
    return True


def test_jn_zeros():
    assert eq(jn_zeros(0, 4, method="scipy"),
            [3.141592, 6.283185, 9.424777, 12.566370])
    assert eq(jn_zeros(1, 4, method="scipy"),
            [4.493409, 7.725251, 10.904121, 14.066193])
    assert eq(jn_zeros(2, 4, method="scipy"),
            [5.763459, 9.095011, 12.322940, 15.514603])
    assert eq(jn_zeros(3, 4, method="scipy"),
            [6.987932, 10.417118, 13.698023, 16.923621])
    assert eq(jn_zeros(4, 4, method="scipy"),
            [8.182561, 11.704907, 15.039664, 18.301255])