'test the salt and pepper function without specified min and max values.'

def test_salt_and_pepper_noise_without_min_max(self):

    x_sp = utils.salt_and_pepper_noise(self.x, self.v)
    mn = self.x.min()
    mx = self.x.max()
    for sample in x_sp:
        salted_elements = sum([((i == mn) or (i == mx)) for i in sample])
        self.assertAlmostEqual(salted_elements, self.v, delta=2)
