From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/test/test_singleton.rb | 103 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 jni/ruby/test/test_singleton.rb

(limited to 'jni/ruby/test/test_singleton.rb')

diff --git a/jni/ruby/test/test_singleton.rb b/jni/ruby/test/test_singleton.rb
new file mode 100644
index 0000000..259f9c5
--- /dev/null
+++ b/jni/ruby/test/test_singleton.rb
@@ -0,0 +1,103 @@
+require 'test/unit'
+require 'singleton'
+
+class TestSingleton < Test::Unit::TestCase
+  class SingletonTest
+    include Singleton
+  end
+
+  def test_marshal
+    o1 = SingletonTest.instance
+    m = Marshal.dump(o1)
+    o2 = Marshal.load(m)
+    assert_same(o1, o2)
+  end
+
+  def test_instance_never_changes
+    a = SingletonTest.instance
+    b = SingletonTest.instance
+    assert_same a, b
+  end
+
+  def test_initialize_raises_exception
+    assert_raises NoMethodError do
+      SingletonTest.new
+    end
+  end
+
+  def test_allocate_raises_exception
+    assert_raises NoMethodError do
+      SingletonTest.allocate
+    end
+  end
+
+  def test_clone_raises_exception
+    exception = assert_raises TypeError do
+      SingletonTest.instance.clone
+    end
+
+    expected = "can't clone instance of singleton TestSingleton::SingletonTest"
+
+    assert_equal expected, exception.message
+  end
+
+  def test_dup_raises_exception
+    exception = assert_raises TypeError do
+      SingletonTest.instance.dup
+    end
+
+    expected = "can't dup instance of singleton TestSingleton::SingletonTest"
+
+    assert_equal expected, exception.message
+  end
+
+  def test_include_in_module_raises_exception
+    mod = Module.new
+
+    exception = assert_raises TypeError do
+      mod.class_eval do
+        include Singleton
+      end
+    end
+
+    expected = "Inclusion of the OO-Singleton module in module #{mod}"
+
+    assert_equal expected, exception.message
+  end
+
+  def test_extending_singleton_raises_exception
+    assert_raises NoMethodError do
+      'foo'.extend Singleton
+    end
+  end
+
+  def test_inheritance_works_with_overridden_inherited_method
+    super_super_called = false
+
+    outer = Class.new do
+      define_singleton_method :inherited do |sub|
+        super_super_called = true
+      end
+    end
+
+    inner = Class.new(outer) do
+      include Singleton
+    end
+
+    tester = Class.new(inner)
+
+    assert super_super_called
+
+    a = tester.instance
+    b = tester.instance
+    assert_same a, b
+  end
+
+  def test_class_level_cloning_preserves_singleton_behavior
+    klass = SingletonTest.clone
+
+    a = klass.instance
+    b = klass.instance
+    assert_same a, b
+  end
+end
-- 
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