67 lines
1.4 KiB
Ruby
67 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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require 'test/unit'
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require 'observer'
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class TestObserver < Test::Unit::TestCase
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class TestObservable
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include Observable
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def notify(*args)
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changed
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notify_observers(*args)
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end
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end
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class TestWatcher
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def initialize(observable)
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@notifications = []
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observable.add_observer(self)
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end
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attr_reader :notifications
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def update(*args)
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@notifications << args
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end
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end
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def test_observers
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observable = TestObservable.new
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assert_equal(0, observable.count_observers)
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watcher1 = TestWatcher.new(observable)
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assert_equal(1, observable.count_observers)
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observable.notify("test", 123)
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watcher2 = TestWatcher.new(observable)
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assert_equal(2, observable.count_observers)
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observable.notify(42)
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assert_equal([["test", 123], [42]], watcher1.notifications)
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assert_equal([[42]], watcher2.notifications)
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observable.delete_observer(watcher1)
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assert_equal(1, observable.count_observers)
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observable.notify(:cats)
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assert_equal([["test", 123], [42]], watcher1.notifications)
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assert_equal([[42], [:cats]], watcher2.notifications)
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observable.delete_observers
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assert_equal(0, observable.count_observers)
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observable.notify("nope")
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assert_equal([["test", 123], [42]], watcher1.notifications)
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assert_equal([[42], [:cats]], watcher2.notifications)
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end
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end
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