[ruby/singleton] Revert "Simplify the implementation

(https://github.com/ruby/singleton/pull/7)"

This reverts commit https://github.com/ruby/singleton/commit/545b6b61a40d.

  This change break Rails CI: https://bugs.ruby-lang.org/issues/19711

https://github.com/ruby/singleton/commit/911531d508

1 files changed, 0 insertions, 11 deletions

diff --git a/test/test_singleton.rb b/test/test_singleton.rb
index b08972b9d5..b3c48bb5f5 100644
--- a/test/test_singleton.rb
+++ b/test/test_singleton.rb
@@ -94,13 +94,6 @@ class TestSingleton < Test::Unit::TestCase
     assert_same a, b
   end
 
-  def test_inheritance_creates_separate_singleton
-    a = SingletonTest.instance
-    b = Class.new(SingletonTest).instance
-
-    assert_not_same a, b
-  end
-
   def test_class_level_cloning_preserves_singleton_behavior
     klass = SingletonTest.clone
 
@@ -108,8 +101,4 @@ class TestSingleton < Test::Unit::TestCase
     b = klass.instance
     assert_same a, b
   end
-
-  def test_class_level_cloning_creates_separate_singleton
-    assert_not_same SingletonTest.instance, SingletonTest.clone.instance
-  end
 end