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#!/usr/bin/env python

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

#

# Partially based on AboutMethods in the Ruby Koans

#

from runner.koan import *

def my_global_function(a, b):

return a + b

class AboutMethods(Koan):

def test_calling_a_global_function(self):

self.assertEqual(__, my_global_function(2, 3))

# NOTE: Wrong number of arguments is not a SYNTAX error, but a

# runtime error.

def test_calling_functions_with_wrong_number_of_arguments(self):

try:

my_global_function()

except Exception as exception:

self.assertEqual(__, type(exception).__name__)

self.assertMatch(

r'my_global_function\(\) takes exactly 2 arguments \(0 given\)',

exception[0])

try:

my_global_function(1, 2, 3)

except Exception as e:

# Note, watch out for parenthesis. They need slashes in front!

self.assertMatch(__, e[0])

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

def pointless_method(self, a, b):

sum = a + b

def test_which_does_not_return_anything(self):

self.assertEqual(__, self.pointless_method(1, 2))

# Notice that methods accessed from class scope do not require

# you to pass the first "self" argument?

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

def method_with_defaults(self, a, b='default_value'):

return [a, b]

def test_calling_with_default_values(self):

self.assertEqual(__, self.method_with_defaults(1))

self.assertEqual(__, self.method_with_defaults(1, 2))

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

def method_with_var_args(self, *args):

return args

def test_calling_with_variable_arguments(self):

self.assertEqual(__, self.method_with_var_args())

self.assertEqual(('one', ), self.method_with_var_args('one'))

self.assertEqual(__, self.method_with_var_args('one', 'two'))

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

def function_with_the_same_name(self, a, b):

return a + b

def test_functions_without_self_arg_are_global_functions(self):

def function_with_the_same_name(a, b):

return a * b

self.assertEqual(__, function_with_the_same_name(3, 4))

def test_calling_methods_in_same_class_with_explicit_receiver(self):

def function_with_the_same_name(a, b):

return a * b

self.assertEqual(__, self.function_with_the_same_name(3, 4))

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

def another_method_with_the_same_name(self):

return 10

link_to_overlapped_method = another_method_with_the_same_name

def another_method_with_the_same_name(self):

return 42

def test_that_old_methods_are_hidden_by_redefinitions(self):

self.assertEqual(__, self.another_method_with_the_same_name())

def test_that_overlapped_method_is_still_there(self):

self.assertEqual(__, self.link_to_overlapped_method())

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

def empty_method(self):

pass

def test_methods_that_do_nothing_need_to_use_pass_as_a_filler(self):

self.assertEqual(__, self.empty_method())

def test_pass_does_nothing_at_all(self):

"You"

"shall"

"not"

pass

self.assertEqual(____, "Still got to this line" != None)

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

def one_line_method(self): return 'Madagascar'

def test_no_indentation_required_for_one_line_statement_bodies(self):

self.assertEqual(__, self.one_line_method())

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

def method_with_documentation(self):

"A string placed at the beginning of a function is used for documentation"

return "ok"

def test_the_documentation_can_be_viewed_with_the_doc_method(self):

self.assertMatch(__, self.method_with_documentation.__doc__)

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

class Dog(object):

def name(self):

return "Fido"

def _tail(self):

# Prefixing a method with an underscore implies private scope

return "wagging"

def __password(self):

return 'password' # Genius!

def test_calling_methods_in_other_objects(self):

rover = self.Dog()

self.assertEqual(__, rover.name())

def test_private_access_is_implied_but_not_enforced(self):

rover = self.Dog()

# This is a little rude, but legal

self.assertEqual(__, rover._tail())

def test_double_underscore_attribute_prefixes_cause_name_mangling(self):

"""Attributes names that start with a double underscore get

mangled when an instance is created."""

rover = self.Dog()

try:

#This may not be possible...

password = rover.__password()

except Exception as ex:

self.assertEqual(__, type(ex).__name__)

# But this still is!

self.assertEqual(__, rover._Dog__password())

# Name mangling exists to avoid name clash issues when subclassing.

# It is not for providing effective access protection