8 files changed, 115 insertions, 0 deletions
diff --git a/spec/ruby/library/singleton/allocate_spec.rb b/spec/ruby/library/singleton/allocate_spec.rb
new file mode 100644
index 0000000000..6a1512d53b
--- /dev/null
+++ b/spec/ruby/library/singleton/allocate_spec.rb
@@ -0,0 +1,8 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Singleton.allocate" do
+  it "is a private method" do
+    -> { SingletonSpecs::MyClass.allocate }.should raise_error(NoMethodError)
+  end
+end
diff --git a/spec/ruby/library/singleton/clone_spec.rb b/spec/ruby/library/singleton/clone_spec.rb
new file mode 100644
index 0000000000..3635bcd594
--- /dev/null
+++ b/spec/ruby/library/singleton/clone_spec.rb
@@ -0,0 +1,8 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Singleton#clone" do
+  it "is prevented" do
+    -> { SingletonSpecs::MyClass.instance.clone }.should raise_error(TypeError)
+  end
+end
diff --git a/spec/ruby/library/singleton/dump_spec.rb b/spec/ruby/library/singleton/dump_spec.rb
new file mode 100644
index 0000000000..333e3bc4b0
--- /dev/null
+++ b/spec/ruby/library/singleton/dump_spec.rb
@@ -0,0 +1,14 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Singleton#_dump" do
+
+  it "returns an empty string" do
+    SingletonSpecs::MyClass.instance.send(:_dump).should == ""
+  end
+
+  it "returns an empty string from a singleton subclass" do
+    SingletonSpecs::MyClassChild.instance.send(:_dump).should == ""
+  end
+
+end
diff --git a/spec/ruby/library/singleton/dup_spec.rb b/spec/ruby/library/singleton/dup_spec.rb
new file mode 100644
index 0000000000..13d5a213e9
--- /dev/null
+++ b/spec/ruby/library/singleton/dup_spec.rb
@@ -0,0 +1,8 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Singleton#dup" do
+  it "is prevented" do
+    -> { SingletonSpecs::MyClass.instance.dup }.should raise_error(TypeError)
+  end
+end
diff --git a/spec/ruby/library/singleton/fixtures/classes.rb b/spec/ruby/library/singleton/fixtures/classes.rb
new file mode 100644
index 0000000000..c718ebaec8
--- /dev/null
+++ b/spec/ruby/library/singleton/fixtures/classes.rb
@@ -0,0 +1,18 @@
+require 'singleton'
+
+module SingletonSpecs
+  class MyClass
+    attr_accessor :data
+    include Singleton
+  end
+
+  class NewSpec
+    include Singleton
+  end
+
+  class MyClassChild < MyClass
+  end
+
+  class NotInstantiated < MyClass
+  end
+end
diff --git a/spec/ruby/library/singleton/instance_spec.rb b/spec/ruby/library/singleton/instance_spec.rb
new file mode 100644
index 0000000000..1679728d4c
--- /dev/null
+++ b/spec/ruby/library/singleton/instance_spec.rb
@@ -0,0 +1,30 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Singleton.instance" do
+  it "returns an instance of the singleton class" do
+    SingletonSpecs::MyClass.instance.should be_kind_of(SingletonSpecs::MyClass)
+  end
+
+  it "returns the same instance for multiple calls to instance" do
+    SingletonSpecs::MyClass.instance.should equal(SingletonSpecs::MyClass.instance)
+  end
+
+  it "returns an instance of the singleton's subclasses" do
+    SingletonSpecs::MyClassChild.instance.should be_kind_of(SingletonSpecs::MyClassChild)
+  end
+
+  it "returns the same instance for multiple class to instance on subclasses" do
+    SingletonSpecs::MyClassChild.instance.should equal(SingletonSpecs::MyClassChild.instance)
+  end
+
+  it "returns an instance of the singleton's clone" do
+    klone = SingletonSpecs::MyClassChild.clone
+    klone.instance.should be_kind_of(klone)
+  end
+
+  it "returns the same instance for multiple class to instance on clones" do
+    klone = SingletonSpecs::MyClassChild.clone
+    klone.instance.should equal(klone.instance)
+  end
+end
diff --git a/spec/ruby/library/singleton/load_spec.rb b/spec/ruby/library/singleton/load_spec.rb
new file mode 100644
index 0000000000..4c753f9e7a
--- /dev/null
+++ b/spec/ruby/library/singleton/load_spec.rb
@@ -0,0 +1,21 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+# TODO: change to a.should be_equal(b)
+# TODO: write spec for cloning classes and calling private methods
+# TODO: write spec for private_methods not showing up via extended
+describe "Singleton._load" do
+  it "returns the singleton instance for anything passed in" do
+    klass = SingletonSpecs::MyClass
+    klass._load("").should equal(klass.instance)
+    klass._load("42").should equal(klass.instance)
+    klass._load(42).should equal(klass.instance)
+  end
+
+  it "returns the singleton instance for anything passed in to subclass" do
+    subklass = SingletonSpecs::MyClassChild
+    subklass._load("").should equal(subklass.instance)
+    subklass._load("42").should equal(subklass.instance)
+    subklass._load(42).should equal(subklass.instance)
+  end
+end
diff --git a/spec/ruby/library/singleton/new_spec.rb b/spec/ruby/library/singleton/new_spec.rb
new file mode 100644
index 0000000000..2f45db819c
--- /dev/null
+++ b/spec/ruby/library/singleton/new_spec.rb
@@ -0,0 +1,8 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Singleton.new" do
+  it "is a private method" do
+    -> { SingletonSpecs::NewSpec.new }.should raise_error(NoMethodError)
+  end
+end