Add specs for Method#/UnboundMethod#original_name through a three-alias chain

Extend MethodSpecs::Methods and UnboundMethodSpecs::Methods with a third
alias hop (alias qux baz), and add examples verifying that
Method#original_name and UnboundMethod#original_name still return :foo
when reached through three levels of aliasing.

The existing "aliased twice" examples only exercise two-hop chains, which
doesn't catch implementations that resolve a fixed depth rather than walking
the full chain.

Author: sampokuokkanen

core/method/fixtures/classes.rb

@@ -27,6 +27,7 @@ def foo
 
     alias bar foo
     alias baz bar
+    alias qux baz
 
     def same_as_foo
       true

core/method/original_name_spec.rb

@@ -20,6 +20,12 @@
     obj.method(:baz).unbind.bind(obj).original_name.should == :foo
   end
 
+  it "returns the original name even when aliased thrice" do
+    obj = MethodSpecs::Methods.new
+    obj.method(:qux).original_name.should == :foo
+    obj.method(:qux).unbind.bind(obj).original_name.should == :foo
+  end
+
   it "returns the source UnboundMethod's name (not the name given to define_method)" do
     klass = Class.new { define_method(:my_inspect, ::Kernel.instance_method(:inspect)) }
     klass.new.method(:my_inspect).original_name.should == :inspect

core/unboundmethod/fixtures/classes.rb

@@ -36,6 +36,7 @@ def with_block(&block); end
 
     alias bar foo
     alias baz bar
+    alias qux baz
     alias alias_1 foo
     alias alias_2 foo
 

core/unboundmethod/original_name_spec.rb

@@ -20,6 +20,12 @@
     UnboundMethodSpecs::Methods.instance_method(:baz).original_name.should == :foo
   end
 
+  it "returns the original name even when aliased thrice" do
+    obj = UnboundMethodSpecs::Methods.new
+    obj.method(:qux).unbind.original_name.should == :foo
+    UnboundMethodSpecs::Methods.instance_method(:qux).original_name.should == :foo
+  end
+
   it "returns the source UnboundMethod's name (not the name given to define_method)" do
     klass = Class.new { define_method(:my_inspect, ::Kernel.instance_method(:inspect)) }
     klass.instance_method(:my_inspect).original_name.should == :inspect