#!/usr/bin/env python

"""

code that tests the circle class defined in circle.py

can be run with py.test

"""

import pytest # used for the exception testing

import math

from circle import Circle

#from circle_solution1 import Circle

def test_create():

c = Circle(4)

assert c.radius == 4

def test_change_radius():

c = Circle(3)

c.radius = 4

assert c.radius == 4

def test_diameter():

c = Circle(4)

assert c.diameter == 8

def test_change_diameter():

c = Circle(2)

assert c.radius == 2

assert c.diameter == 4

c.diameter = 6

assert c.radius == 3

assert c.diameter == 6

def test_area():

c = Circle(4)

assert c.area == math.pi*16

def test_set_area():

c = Circle(4)

with pytest.raises(AttributeError):

c.area = 44

## the extra credit: classmethod:

# def test_alternate_constructor():

# c = Circle.from_diameter(8)

# assert c.diameter == 8

# assert c.radius == 4