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#!/usr/bin/env python

# -*- coding: utf-8 -*-

from runner.koan import *

def function():

return "pineapple"

def function2():

return "tractor"

class Class:

def method(self):

return "parrot"

class AboutMethodBindings(Koan):

def test_methods_are_bound_to_an_object(self):

obj = Class()

self.assertEqual(__, obj.method.__self__ == obj)

def test_methods_are_also_bound_to_a_function(self):

obj = Class()

self.assertEqual(__, obj.method())

self.assertEqual(__, obj.method.__func__(obj))

def test_functions_have_attributes(self):

obj = Class()

self.assertEqual(__, len(dir(function)))

self.assertEqual(__, dir(function) == dir(obj.method.__func__))

def test_methods_have_different_attributes(self):

obj = Class()

self.assertEqual(__, len(dir(obj.method)))

def test_setting_attributes_on_an_unbound_function(self):

function.cherries = 3

self.assertEqual(__, function.cherries)

def test_setting_attributes_on_a_bound_method_directly(self):

obj = Class()

with self.assertRaises(___): obj.method.cherries = 3

def test_setting_attributes_on_methods_by_accessing_the_inner_function(self):

obj = Class()

obj.method.__func__.cherries = 3

self.assertEqual(__, obj.method.cherries)

def test_functions_can_have_inner_functions(self):

function2.get_fruit = function

self.assertEqual(__, function2.get_fruit())

def test_inner_functions_are_unbound(self):

function2.get_fruit = function

with self.assertRaises(___): cls = function2.get_fruit.__self__

# ------------------------------------------------------------------

class BoundClass:

def __get__(self, obj, cls):

return (self, obj, cls)

binding = BoundClass()

def test_get_descriptor_resolves_attribute_binding(self):

bound_obj, binding_owner, owner_type = self.binding

# Look at BoundClass.__get__():

# bound_obj = self

# binding_owner = obj

# owner_type = cls

self.assertEqual(__, bound_obj.__class__.__name__)

self.assertEqual(__, binding_owner.__class__.__name__)

self.assertEqual(AboutMethodBindings, owner_type)

# ------------------------------------------------------------------

class SuperColor:

def __init__(self):

self.choice = None

def __set__(self, obj, val):

self.choice = val

color = SuperColor()

def test_set_descriptor_changes_behavior_of_attribute_assignment_changes(self):

self.assertEqual(None, self.color.choice)

self.color = 'purple'

self.assertEqual(__, self.color.choice)