Delegate to `eql?` [Fix GH-1564]

* lib/delegate.rb (eql?): Delegate to `eql?` of the inner object.
  based on the patch by giginet <giginet.net@gmail.com>.
  [ruby-core:76950] [Bug #12684]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59167 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 20 insertions, 0 deletions

diff --git a/test/test_delegate.rb b/test/test_delegate.rb
index 18c175c719..48bf9cdbf0 100644
--- a/test/test_delegate.rb
+++ b/test/test_delegate.rb
@@ -3,6 +3,14 @@ require 'test/unit'
 require 'delegate'
 
 class TestDelegateClass < Test::Unit::TestCase
+  module PP
+    def mu_pp(obj)
+      str = super
+      str = "#<#{obj.class}: #{str}>" if Delegator === obj
+      str
+    end
+  end
+
   module M
     attr_reader :m
   end
@@ -119,6 +127,18 @@ class TestDelegateClass < Test::Unit::TestCase
     assert_equal([:bar], s.methods(false))
   end
 
+  def test_eql?
+    extend PP
+    s0 = SimpleDelegator.new("foo")
+    s1 = SimpleDelegator.new("bar")
+    s2 = SimpleDelegator.new("foo")
+    assert_operator(s0, :eql?, s0)
+    assert_operator(s0, :eql?, "foo")
+    assert_operator(s0, :eql?, s2)
+    assert_not_operator(s0, :eql?, s1)
+    assert_not_operator(s0, :eql?, "bar")
+  end
+
   class Foo
     private
     def delegate_test_private