From 4d6aeebbabe6304dadcc83c659bf9e2f979990b3 Mon Sep 17 00:00:00 2001
From: hsbt <hsbt@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 26 Mar 2015 01:05:18 +0000
Subject: [PATCH] * test/test_observer.rb: add tests for Observable module.  
 [fix GH-859] Patch by @brightbits

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50095 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog             |  5 ++++
 test/test_observer.rb | 65 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 test/test_observer.rb

diff --git a/ChangeLog b/ChangeLog
index 24c7cbee4e..15c368d785 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Mar 26 10:05:13 2015  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* test/test_observer.rb: add tests for Observable module.
+	  [fix GH-859] Patch by @brightbits
+
 Thu Mar 26 06:35:10 2015  Eric Wong  <e@80x24.org>
 
 	* README.EXT: add redirect [ruby-core:68631]
diff --git a/test/test_observer.rb b/test/test_observer.rb
new file mode 100644
index 0000000000..e2c159ad09
--- /dev/null
+++ b/test/test_observer.rb
@@ -0,0 +1,65 @@
+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