1 files changed, 31 insertions, 0 deletions
diff --git a/spec/ruby/core/method/shared/aliased_inspect.rb b/spec/ruby/core/method/shared/aliased_inspect.rb
new file mode 100644
index 0000000000..2a622c2f97
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+++ b/spec/ruby/core/method/shared/aliased_inspect.rb
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+describe :method_to_s_aliased, shared: true do
+  # @object converts a bound Method to either a Method (identity) or an
+  # UnboundMethod (-> meth { meth.unbind }), so these expectations cover both
+  # Method#to_s/#inspect and UnboundMethod#to_s/#inspect.
+
+  it "shows the original name in parentheses for an aliased method" do
+    klass = Class.new do
+      def original_method; end
+      alias_method :renamed_method, :original_method
+    end
+    @object.call(klass.new.method(:renamed_method)).send(@method).should.include? '#renamed_method(original_method)'
+  end
+
+  it "shows the source UnboundMethod's name in parentheses for a define_method'd method" do
+    klass = Class.new { define_method(:renamed_is_a?, ::Kernel.instance_method(:is_a?)) }
+    @object.call(klass.new.method(:renamed_is_a?)).send(@method).should.include? '#renamed_is_a?(is_a?)'
+  end
+
+  it "does not annotate a directly looked-up Kernel method with a shared internal name" do
+    @object.call(Object.new.method(:is_a?)).send(@method).should_not.include? '(kind_of?)'
+    @object.call(Object.new.method(:kind_of?)).send(@method).should_not.include? '(is_a?)'
+  end
+
+  it "shows the source name when aliasing a define_method'd Kernel method" do
+    klass = Class.new do
+      define_method(:my_is_a?, ::Kernel.instance_method(:is_a?))
+      alias_method :renamed_is_a?, :my_is_a?
+    end
+    @object.call(klass.new.method(:renamed_is_a?)).send(@method).should.include? '#renamed_is_a?(is_a?)'
+  end
+end