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require 'abstract_unit'
uses_mocha 'Memoizable' do
class MemoizableTest < Test::Unit::TestCase
class Person
extend ActiveSupport::Memoizable
def name
fetch_name_from_floppy
end
memoize :name
def age
nil
end
def counter
@counter ||= 0
@counter += 1
end
memoize :age, :counter
private
def fetch_name_from_floppy
"Josh"
end
end
def setup
@person = Person.new
end
def test_memoization
assert_equal "Josh", @person.name
@person.expects(:fetch_name_from_floppy).never
2.times { assert_equal "Josh", @person.name }
end
def test_reloadable
counter = @person.counter
assert_equal 1, @person.counter
assert_equal 2, @person.counter(:reload)
end
def test_memoized_methods_are_frozen
assert_equal true, @person.name.frozen?
@person.freeze
assert_equal "Josh", @person.name
assert_equal true, @person.name.frozen?
end
def test_memoization_frozen_with_nil_value
@person.freeze
assert_equal nil, @person.age
end
def test_double_memoization
assert_raise(RuntimeError) { Person.memoize :name }
end
class Company
def name
lookup_name
end
def lookup_name
"37signals"
end
end
def test_object_memoization
company = Company.new
company.extend ActiveSupport::Memoizable
company.memoize :name
assert_equal "37signals", company.name
# Mocha doesn't play well with frozen objects
company.metaclass.instance_eval { define_method(:lookup_name) { b00m } }
assert_equal "37signals", company.name
assert_equal true, company.name.frozen?
company.freeze
assert_equal true, company.name.frozen?
end
end
end
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