def test_find_center_point_of_circle_zero_det(self):
"""Checks that None is given if det is zero
"""
point_1 = (0, 0)
point_2 = (0, 0)
point_3 = (0, 0)
assert find_center_point_of_circle(point_1, point_2,
point_3) == (None, np.inf)
def test_find_center_point_of_circle(self):
"""passes three points on a circle to the function and checks that the
radius and center of the circle is calculated correctly"""
point_1 = (0, 20)
point_2 = (20, 0)
point_3 = (0, -20)
assert find_center_point_of_circle(point_1, point_2,
point_3) == ((0, 0), 20)