1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/module/private_spec.rb b/spec/ruby/core/module/private_spec.rb
new file mode 100644
index 0000000000..bfdb5016c2
--- /dev/null
+++ b/spec/ruby/core/module/private_spec.rb
@@ -0,0 +1,54 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../shared/set_visibility', __FILE__)
+
+describe "Module#private" do
+  it_behaves_like :set_visibility, :private
+
+  it "makes the target method uncallable from other types" do
+    obj = Object.new
+    class << obj
+      def foo; true; end
+    end
+
+    obj.foo.should == true
+
+    class << obj
+      private :foo
+    end
+
+    lambda { obj.foo }.should raise_error(NoMethodError)
+  end
+
+  it "makes a public Object instance method private in a new module" do
+    m = Module.new do
+      private :module_specs_public_method_on_object
+    end
+
+    m.should have_private_instance_method(:module_specs_public_method_on_object)
+
+    # Ensure we did not change Object's method
+    Object.should_not have_private_instance_method(:module_specs_public_method_on_object)
+  end
+
+  it "makes a public Object instance method private in Kernel" do
+    Kernel.should have_private_instance_method(
+                  :module_specs_public_method_on_object_for_kernel_private)
+    Object.should_not have_private_instance_method(
+                  :module_specs_public_method_on_object_for_kernel_private)
+  end
+
+  it "returns self" do
+    (class << Object.new; self; end).class_eval do
+      def foo; end
+      private(:foo).should equal(self)
+      private.should equal(self)
+    end
+  end
+
+  it "raises a NameError when given an undefined name" do
+    lambda do
+      Module.new.send(:private, :undefined)
+    end.should raise_error(NameError)
+  end
+end