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# Author:: Nathaniel Talbott.
# Copyright:: Copyright (c) 2000-2002 Nathaniel Talbott. All rights reserved.
# License:: Ruby license.
require 'test/unit/util/observable'
module Test
module Unit
module Util
class TC_Observable < TestCase
class TF_Observable
include Observable
end
def setup
@observable = TF_Observable.new
end
def test_simple_observation
assert_raise(ArgumentError, "add_listener should throw an exception if no callback is supplied") do
@observable.add_listener(:property, "a")
end
heard = false
callback = proc { heard = true }
assert_equal("a", @observable.add_listener(:property, "a", &callback), "add_listener should return the listener that was added")
count = 0
@observable.instance_eval do
count = notify_listeners(:property)
end
assert_equal(1, count, "notify_listeners should have returned the number of listeners that were notified")
assert(heard, "Should have heard the property changed")
heard = false
assert_equal(callback, @observable.remove_listener(:property, "a"), "remove_listener should return the callback")
count = 1
@observable.instance_eval do
count = notify_listeners(:property)
end
assert_equal(0, count, "notify_listeners should have returned the number of listeners that were notified")
assert(!heard, "Should not have heard the property change")
end
def test_value_observation
value = nil
@observable.add_listener(:property, "a") do |passed_value|
value = passed_value
end
count = 0
@observable.instance_eval do
count = notify_listeners(:property, "stuff")
end
assert_equal(1, count, "Should have update the correct number of listeners")
assert_equal("stuff", value, "Should have received the value as an argument to the listener")
end
def test_multiple_value_observation
values = []
@observable.add_listener(:property, "a") do |first_value, second_value|
values = [first_value, second_value]
end
count = 0
@observable.instance_eval do
count = notify_listeners(:property, "stuff", "more stuff")
end
assert_equal(1, count, "Should have update the correct number of listeners")
assert_equal(["stuff", "more stuff"], values, "Should have received the value as an argument to the listener")
end
def test_add_remove_with_default_listener
assert_raise(ArgumentError, "add_listener should throw an exception if no callback is supplied") do
@observable.add_listener(:property)
end
heard = false
callback = proc { heard = true }
assert_equal(callback, @observable.add_listener(:property, &callback), "add_listener should return the listener that was added")
count = 0
@observable.instance_eval do
count = notify_listeners(:property)
end
assert_equal(1, count, "notify_listeners should have returned the number of listeners that were notified")
assert(heard, "Should have heard the property changed")
heard = false
assert_equal(callback, @observable.remove_listener(:property, callback), "remove_listener should return the callback")
count = 1
@observable.instance_eval do
count = notify_listeners(:property)
end
assert_equal(0, count, "notify_listeners should have returned the number of listeners that were notified")
assert(!heard, "Should not have heard the property change")
end
end
end
end
end
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