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