1 files changed, 199 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/singleton_methods_spec.rb b/spec/ruby/core/kernel/singleton_methods_spec.rb
new file mode 100644
index 0000000000..a7f6969519
--- /dev/null
+++ b/spec/ruby/core/kernel/singleton_methods_spec.rb
@@ -0,0 +1,199 @@
+require_relative '../../spec_helper'
+require_relative '../../fixtures/reflection'
+require_relative 'fixtures/classes'
+
+describe :kernel_singleton_methods, shared: true do
+  it "returns an empty Array for an object with no singleton methods" do
+    ReflectSpecs.o.singleton_methods(*@object).should == []
+  end
+
+  it "returns the names of module methods for a module" do
+    ReflectSpecs::M.singleton_methods(*@object).to_set.should >= Set[:ms_pro, :ms_pub]
+  end
+
+  it "does not return private module methods for a module" do
+    ReflectSpecs::M.singleton_methods(*@object).should_not.include?(:ms_pri)
+  end
+
+  it "returns the names of class methods for a class" do
+    ReflectSpecs::A.singleton_methods(*@object).to_set.should >= Set[:as_pro, :as_pub]
+  end
+
+  it "does not return private class methods for a class" do
+    ReflectSpecs::A.singleton_methods(*@object).should_not.include?(:as_pri)
+  end
+
+  it "returns the names of singleton methods for an object" do
+    ReflectSpecs.os.singleton_methods(*@object).to_set.should >= Set[:os_pro, :os_pub]
+  end
+end
+
+describe :kernel_singleton_methods_modules, shared: true do
+  it "does not return any included methods for a module including a module" do
+    ReflectSpecs::N.singleton_methods(*@object).to_set.should >= Set[:ns_pro, :ns_pub]
+  end
+
+  it "does not return any included methods for a class including a module" do
+    ReflectSpecs::D.singleton_methods(*@object).to_set.should >= Set[:ds_pro, :ds_pub]
+  end
+
+  it "for a module does not return methods in a module prepended to Module itself" do
+    require_relative 'fixtures/singleton_methods'
+    mod = SingletonMethodsSpecs::SelfExtending
+    mod.method(:mspec_test_kernel_singleton_methods).owner.should == SingletonMethodsSpecs::Prepended
+
+    ancestors = mod.singleton_class.ancestors
+    ancestors[0...2].should == [ mod.singleton_class, mod ]
+    ancestors.should.include?(SingletonMethodsSpecs::Prepended)
+
+    # Do not search prepended modules of `Module`, as that's a non-singleton class
+    mod.singleton_methods.should == []
+  end
+end
+
+describe :kernel_singleton_methods_supers, shared: true do
+  it "returns the names of singleton methods for an object extended with a module" do
+    ReflectSpecs.oe.singleton_methods(*@object).to_set.should >= Set[:m_pro, :m_pub]
+  end
+
+  it "returns a unique list for an object extended with a module" do
+    m = ReflectSpecs.oed.singleton_methods(*@object)
+    r = m.select { |x| x == :pub or x == :pro }.sort
+    r.should == [:pro, :pub]
+  end
+
+  it "returns the names of singleton methods for an object extended with two modules" do
+    ReflectSpecs.oee.singleton_methods(*@object).to_set.should >= Set[:m_pro, :m_pub, :n_pro, :n_pub]
+  end
+
+  it "returns the names of singleton methods for an object extended with a module including a module" do
+    ReflectSpecs.oei.singleton_methods(*@object).to_set.should >= Set[:n_pro, :n_pub, :m_pro, :m_pub]
+  end
+
+  it "returns the names of inherited singleton methods for a subclass" do
+    ReflectSpecs::B.singleton_methods(*@object).to_set.should >= Set[:as_pro, :as_pub, :bs_pro, :bs_pub]
+  end
+
+  it "returns a unique list for a subclass" do
+    m = ReflectSpecs::B.singleton_methods(*@object)
+    r = m.select { |x| x == :pub or x == :pro }.sort
+    r.should == [:pro, :pub]
+  end
+
+  it "returns the names of inherited singleton methods for a subclass including a module" do
+    ReflectSpecs::C.singleton_methods(*@object).to_set.should >= Set[:as_pro, :as_pub, :cs_pro, :cs_pub]
+  end
+
+  it "returns a unique list for a subclass including a module" do
+    m = ReflectSpecs::C.singleton_methods(*@object)
+    r = m.select { |x| x == :pub or x == :pro }.sort
+    r.should == [:pro, :pub]
+  end
+
+  it "returns the names of inherited singleton methods for a subclass of a class including a module" do
+    ReflectSpecs::E.singleton_methods(*@object).to_set.should >= Set[:ds_pro, :ds_pub, :es_pro, :es_pub]
+  end
+
+  it "returns the names of inherited singleton methods for a subclass of a class that includes a module, where the subclass also includes a module" do
+    ReflectSpecs::F.singleton_methods(*@object).to_set.should >= Set[:ds_pro, :ds_pub, :fs_pro, :fs_pub]
+  end
+
+  it "returns the names of inherited singleton methods for a class extended with a module" do
+    ReflectSpecs::P.singleton_methods(*@object).to_set.should >= Set[:m_pro, :m_pub]
+  end
+end
+
+describe :kernel_singleton_methods_private_supers, shared: true do
+  it "does not return private singleton methods for an object extended with a module" do
+    ReflectSpecs.oe.singleton_methods(*@object).should_not.include?(:m_pri)
+  end
+
+  it "does not return private singleton methods for an object extended with two modules" do
+    ReflectSpecs.oee.singleton_methods(*@object).should_not.include?(:m_pri)
+  end
+
+  it "does not return private singleton methods for an object extended with a module including a module" do
+    ReflectSpecs.oei.singleton_methods(*@object).should_not.include?(:n_pri)
+    ReflectSpecs.oei.singleton_methods(*@object).should_not.include?(:m_pri)
+  end
+
+  it "does not return private singleton methods for a class extended with a module" do
+    ReflectSpecs::P.singleton_methods(*@object).should_not.include?(:m_pri)
+  end
+
+  it "does not return private inherited singleton methods for a module including a module" do
+    ReflectSpecs::N.singleton_methods(*@object).should_not.include?(:ns_pri)
+  end
+
+  it "does not return private inherited singleton methods for a class including a module" do
+    ReflectSpecs::D.singleton_methods(*@object).should_not.include?(:ds_pri)
+  end
+
+  it "does not return private inherited singleton methods for a subclass" do
+    ReflectSpecs::B.singleton_methods(*@object).should_not.include?(:as_pri)
+    ReflectSpecs::B.singleton_methods(*@object).should_not.include?(:bs_pri)
+  end
+
+  it "does not return private inherited singleton methods for a subclass including a module" do
+    ReflectSpecs::C.singleton_methods(*@object).should_not.include?(:as_pri)
+    ReflectSpecs::C.singleton_methods(*@object).should_not.include?(:cs_pri)
+  end
+
+  it "does not return private inherited singleton methods for a subclass of a class including a module" do
+    ReflectSpecs::E.singleton_methods(*@object).should_not.include?(:ds_pri)
+    ReflectSpecs::E.singleton_methods(*@object).should_not.include?(:es_pri)
+  end
+
+  it "does not return private inherited singleton methods for a subclass of a class that includes a module, where the subclass also includes a module" do
+    ReflectSpecs::F.singleton_methods(*@object).should_not.include?(:ds_pri)
+    ReflectSpecs::F.singleton_methods(*@object).should_not.include?(:fs_pri)
+  end
+end
+
+describe "Kernel#singleton_methods" do
+  describe "when not passed an argument" do
+    it_behaves_like :kernel_singleton_methods, nil, []
+    it_behaves_like :kernel_singleton_methods_supers, nil, []
+    it_behaves_like :kernel_singleton_methods_modules, nil, []
+    it_behaves_like :kernel_singleton_methods_private_supers, nil, []
+  end
+
+  describe "when passed true" do
+    it_behaves_like :kernel_singleton_methods, nil, true
+    it_behaves_like :kernel_singleton_methods_supers, nil, true
+    it_behaves_like :kernel_singleton_methods_modules, nil, true
+    it_behaves_like :kernel_singleton_methods_private_supers, nil, true
+  end
+
+  describe "when passed false" do
+    it_behaves_like :kernel_singleton_methods, nil, false
+    it_behaves_like :kernel_singleton_methods_modules, nil, false
+    it_behaves_like :kernel_singleton_methods_private_supers, nil, false
+
+    it "returns an empty Array for an object extended with a module" do
+      ReflectSpecs.oe.singleton_methods(false).should == []
+    end
+
+    it "returns an empty Array for an object extended with two modules" do
+      ReflectSpecs.oee.singleton_methods(false).should == []
+    end
+
+    it "returns an empty Array for an object extended with a module including a module" do
+      ReflectSpecs.oei.singleton_methods(false).should == []
+    end
+
+    it "returns the names of singleton methods of the subclass" do
+      ReflectSpecs::B.singleton_methods(false).to_set.should >= Set[:bs_pro, :bs_pub]
+    end
+
+    it "does not return names of inherited singleton methods for a subclass" do
+      ReflectSpecs::B.singleton_methods(false).should_not.include?(:as_pro)
+      ReflectSpecs::B.singleton_methods(false).should_not.include?(:as_pub)
+    end
+
+    it "does not return the names of inherited singleton methods for a class extended with a module" do
+      ReflectSpecs::P.singleton_methods(false).should_not.include?(:m_pro)
+      ReflectSpecs::P.singleton_methods(false).should_not.include?(:m_pub)
+    end
+  end
+end