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-rw-r--r--spec/rubyspec/language/singleton_class_spec.rb293
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diff --git a/spec/rubyspec/language/singleton_class_spec.rb b/spec/rubyspec/language/singleton_class_spec.rb
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--- a/spec/rubyspec/language/singleton_class_spec.rb
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-require File.expand_path('../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/class', __FILE__)
-
-describe "A singleton class" do
- it "is TrueClass for true" do
- true.singleton_class.should == TrueClass
- end
-
- it "is FalseClass for false" do
- false.singleton_class.should == FalseClass
- end
-
- it "is NilClass for nil" do
- nil.singleton_class.should == NilClass
- end
-
- it "raises a TypeError for Fixnum's" do
- lambda { 1.singleton_class }.should raise_error(TypeError)
- end
-
- it "raises a TypeError for symbols" do
- lambda { :symbol.singleton_class }.should raise_error(TypeError)
- end
-
- it "is a singleton Class instance" do
- o = mock('x')
- o.singleton_class.should be_kind_of(Class)
- o.singleton_class.should_not equal(Object)
- o.should be_kind_of(o.singleton_class)
- end
-
- it "is a Class for classes" do
- ClassSpecs::A.singleton_class.should be_kind_of(Class)
- end
-
- it "inherits from Class for classes" do
- Class.should be_ancestor_of(Object.singleton_class)
- end
-
- it "is a subclass of Class's singleton class" do
- ec = ClassSpecs::A.singleton_class
- ec.should be_kind_of(Class.singleton_class)
- end
-
- it "is a subclass of the same level of Class's singleton class" do
- ecec = ClassSpecs::A.singleton_class.singleton_class
- class_ec = Class.singleton_class
-
- ecec.should be_kind_of(class_ec.singleton_class)
- ecec.should be_kind_of(class_ec)
- end
-
- it "is a subclass of a superclass's singleton class" do
- ClassSpecs::K.singleton_class.superclass.should ==
- ClassSpecs::H.singleton_class
- end
-
- it "is a subclass of the same level of superclass's singleton class" do
- ClassSpecs::K.singleton_class.singleton_class.superclass.should ==
- ClassSpecs::H.singleton_class.singleton_class
- end
-
- it "for BasicObject has Class as it's superclass" do
- BasicObject.singleton_class.superclass.should == Class
- end
-
- it "for BasicObject has the proper level of superclass for Class" do
- BasicObject.singleton_class.singleton_class.superclass.should ==
- Class.singleton_class
- end
-
- it "has class String as the superclass of a String instance" do
- "blah".singleton_class.superclass.should == String
- end
-
- it "doesn't have singleton class" do
- lambda { bignum_value.singleton_class.superclass.should == Bignum }.should raise_error(TypeError)
- end
-end
-
-describe "A constant on a singleton class" do
- before :each do
- @object = Object.new
- class << @object
- CONST = self
- end
- end
-
- it "can be accessed after the singleton class body is reopened" do
- class << @object
- CONST.should == self
- end
- end
-
- it "can be accessed via self::CONST" do
- class << @object
- self::CONST.should == self
- end
- end
-
- it "can be accessed via const_get" do
- class << @object
- const_get(:CONST).should == self
- end
- end
-
- it "is not defined on the object's class" do
- @object.class.const_defined?(:CONST).should be_false
- end
-
- it "is not defined in the singleton class opener's scope" do
- class << @object
- CONST
- end
- lambda { CONST }.should raise_error(NameError)
- end
-
- it "cannot be accessed via object::CONST" do
- lambda do
- @object::CONST
- end.should raise_error(TypeError)
- end
-
- it "raises a NameError for anonymous_module::CONST" do
- @object = Class.new
- class << @object
- CONST = 100
- end
-
- lambda do
- @object::CONST
- end.should raise_error(NameError)
- end
-
- it "appears in the singleton class constant list" do
- @object.singleton_class.should have_constant(:CONST)
- end
-
- it "does not appear in the object's class constant list" do
- @object.class.should_not have_constant(:CONST)
- end
-
- it "is not preserved when the object is duped" do
- @object = @object.dup
-
- lambda do
- class << @object; CONST; end
- end.should raise_error(NameError)
- end
-
- it "is preserved when the object is cloned" do
- @object = @object.clone
-
- class << @object
- CONST.should_not be_nil
- end
- end
-end
-
-describe "Defining instance methods on a singleton class" do
- before :each do
- @k = ClassSpecs::K.new
- class << @k
- def singleton_method; 1 end
- end
-
- @k_sc = @k.singleton_class
- end
-
- it "defines public methods" do
- @k_sc.should have_public_instance_method(:singleton_method)
- end
-end
-
-describe "Instance methods of a singleton class" do
- before :each do
- k = ClassSpecs::K.new
- @k_sc = k.singleton_class
- @a_sc = ClassSpecs::A.new.singleton_class
- @a_c_sc = ClassSpecs::A.singleton_class
- end
-
- it "include ones of the object's class" do
- @k_sc.should have_instance_method(:example_instance_method)
- end
-
- it "does not include class methods of the object's class" do
- @k_sc.should_not have_instance_method(:example_class_method)
- end
-
- it "include instance methods of Object" do
- @a_sc.should have_instance_method(:example_instance_method_of_object)
- end
-
- it "does not include class methods of Object" do
- @a_sc.should_not have_instance_method(:example_class_method_of_object)
- end
-
- describe "for a class" do
- it "include instance methods of Class" do
- @a_c_sc.should have_instance_method(:example_instance_method_of_class)
- end
-
- it "does not include class methods of Class" do
- @a_c_sc.should_not have_instance_method(:example_class_method_of_class)
- end
-
- it "does not include instance methods of the singleton class of Class" do
- @a_c_sc.should_not have_instance_method(:example_instance_method_of_singleton_class)
- end
-
- it "does not include class methods of the singleton class of Class" do
- @a_c_sc.should_not have_instance_method(:example_class_method_of_singleton_class)
- end
- end
-
- describe "for a singleton class" do
- it "includes instance methods of the singleton class of Class" do
- @a_c_sc.singleton_class.should have_instance_method(:example_instance_method_of_singleton_class)
- end
-
- it "does not include class methods of the singleton class of Class" do
- @a_c_sc.singleton_class.should_not have_instance_method(:example_class_method_of_singleton_class)
- end
- end
-end
-
-describe "Class methods of a singleton class" do
- before :each do
- k = ClassSpecs::K.new
- @k_sc = k.singleton_class
- @a_sc = ClassSpecs::A.new.singleton_class
- @a_c_sc = ClassSpecs::A.singleton_class
- end
-
- it "include ones of the object's class" do
- @k_sc.should have_method(:example_class_method)
- end
-
- it "does not include instance methods of the object's class" do
- @k_sc.should_not have_method(:example_instance_method)
- end
-
- it "include instance methods of Class" do
- @a_sc.should have_method(:example_instance_method_of_class)
- end
-
- it "does not include class methods of Class" do
- @a_sc.should_not have_method(:example_class_method_of_class)
- end
-
- describe "for a class" do
- it "include instance methods of Class" do
- @a_c_sc.should have_method(:example_instance_method_of_class)
- end
-
- it "include class methods of Class" do
- @a_c_sc.should have_method(:example_class_method_of_class)
- end
-
- it "include instance methods of the singleton class of Class" do
- @a_c_sc.should have_method(:example_instance_method_of_singleton_class)
- end
-
- it "does not include class methods of the singleton class of Class" do
- @a_c_sc.should_not have_method(:example_class_method_of_singleton_class)
- end
- end
-
- describe "for a singleton class" do
- it "include instance methods of the singleton class of Class" do
- @a_c_sc.singleton_class.should have_method(:example_instance_method_of_singleton_class)
- end
-
- it "include class methods of the singleton class of Class" do
- @a_c_sc.singleton_class.should have_method(:example_class_method_of_singleton_class)
- end
- end
-end
-
-describe "Instantiating a singleton class" do
- it "raises a TypeError when new is called" do
- lambda {
- Object.new.singleton_class.new
- }.should raise_error(TypeError)
- end
-
- it "raises a TypeError when allocate is called" do
- lambda {
- Object.new.singleton_class.allocate
- }.should raise_error(TypeError)
- end
-end