#!/usr/bin/env python

"""code that tests the circle class defined in circle.py

This version adds more tests

can be run with py.test

"""

import math

import pytest # used for the exception testing

from circle 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

## the magic methods:

def test_str():

c = Circle(3)

assert str(c) == 'Circle with radius: 3.000000'

def test_repr():

c = Circle(3)

assert repr(c) == 'Circle(3)'

def test_addition():

c1 = Circle(2)

c2 = Circle(3)

c3 = c1 + c2

assert c3.radius == 5

def test_multiplication():

c1 = Circle(2)

c3 = c1 * 4

assert c3.radius == 8

def test_equal():

c1 = Circle(3)

c2 = Circle(3.0)

assert c1 == c2

assert c1 <= c2

assert c1 >= c2

def test_not_equal():

c1 = Circle(2.9)

c2 = Circle(3.0)

assert c1 != c2

def test_greater():

c1 = Circle(2)

c2 = Circle(3)

assert c2 > c1

assert c2 >= c1

def test_less():

c1 = Circle(2)

c2 = Circle(3)

assert c1 < c2

assert c1 <= c2