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require File.expand_path(File.dirname(__FILE__) + '/edgecase')
def my_global_method(a,b)
a + b
end
class AboutMethods < EdgeCase::Koan
def test_calling_global_methods
assert_equal 5, my_global_method(2,3)
end
def test_calling_global_methods_without_parentheses
result = my_global_method 2, 3
assert_equal 5, result
end
# (NOTE: We are Using eval below because the example code is
# considered to be syntactically invalid).
def test_sometimes_missing_parentheses_are_ambiguous
eval "assert_equal 5, my_global_method (2, 3)" # ENABLE CHECK
#
# Ruby doesn't know if you mean:
#
# assert_equal(5, my_global_method(2), 3)
# or
# assert_equal(5, my_global_method(2, 3))
#
# Rewrite the eval string to continue.
#
end
# NOTE: wrong number of argument is not a SYNTAX error, but a
# runtime error.
def test_calling_global_methods_with_wrong_number_of_arguments
exception = assert_raise(ArgumentError) do
my_global_method
end
assert_match(/wrong number of arguments/, exception.message)
exception = assert_raise(ArgumentError) do
my_global_method(1,2,3)
end
assert_match(/wrong number of arguments/, exception.message)
end
# ------------------------------------------------------------------
def method_with_defaults(a, b=:default_value)
[a, b]
end
def test_calling_with_default_values
assert_equal [1, :default_value], method_with_defaults(1)
assert_equal [1, 2], method_with_defaults(1, 2)
end
# ------------------------------------------------------------------
def method_with_var_args(*args)
args
end
def test_calling_with_variable_arguments
assert_equal [], method_with_var_args
assert_equal [:one], method_with_var_args(:one)
assert_equal [:one, :two], method_with_var_args(:one, :two)
end
# ------------------------------------------------------------------
def method_with_explicit_return
:a_non_return_value
return :return_value
:another_non_return_value
end
def test_method_with_explicit_return
assert_equal :return_value, method_with_explicit_return
end
# ------------------------------------------------------------------
def method_without_explicit_return
:a_non_return_value
:return_value
end
def test_method_without_explicit_return
assert_equal :return_value, method_without_explicit_return
end
# ------------------------------------------------------------------
def my_same_class_method(a, b)
a * b
end
def test_calling_methods_in_same_class
assert_equal 12, my_same_class_method(3,4)
end
def test_calling_methods_in_same_class_with_explicit_receiver
assert_equal 12, self.my_same_class_method(3,4)
end
# ------------------------------------------------------------------
def my_private_method
"a secret"
end
private :my_private_method
def test_calling_private_methods_without_receiver
assert_equal "a secret", my_private_method
end
def test_calling_private_methods_with_an_explicit_receiver
exception = assert_raise(NoMethodError) do
self.my_private_method
end
assert_match /private method/, exception.message
end
# ------------------------------------------------------------------
class Dog
def name
"Fido"
end
private
def tail
"tail"
end
end
def test_calling_methods_in_other_objects_require_explicit_receiver
rover = Dog.new
assert_equal "Fido", rover.name
end
def test_calling_private_methods_in_other_objects
rover = Dog.new
assert_raise(NoMethodError) do
rover.tail
end
end
end
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