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