1 files changed, 10 insertions, 3 deletions
diff --git a/test/ruby/test_class.rb b/test/ruby/test_class.rb
index 98acbaf67b..710b8a6f7b 100644
--- a/test/ruby/test_class.rb
+++ b/test/ruby/test_class.rb
@@ -96,6 +96,13 @@ class TestClass < Test::Unit::TestCase
 
   def test_superclass_of_basicobject
     assert_equal(nil, BasicObject.superclass)
+
+    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
+    begin;
+      module Mod end
+      BasicObject.include(Mod)
+      assert_equal(nil, BasicObject.superclass)
+    end;
   end
 
   def test_module_function
@@ -782,15 +789,15 @@ class TestClass < Test::Unit::TestCase
       c.attached_object
     end
 
-    assert_raise_with_message(TypeError, /`NilClass' is not a singleton class/) do
+    assert_raise_with_message(TypeError, /'NilClass' is not a singleton class/) do
       nil.singleton_class.attached_object
     end
 
-    assert_raise_with_message(TypeError, /`FalseClass' is not a singleton class/) do
+    assert_raise_with_message(TypeError, /'FalseClass' is not a singleton class/) do
       false.singleton_class.attached_object
     end
 
-    assert_raise_with_message(TypeError, /`TrueClass' is not a singleton class/) do
+    assert_raise_with_message(TypeError, /'TrueClass' is not a singleton class/) do
       true.singleton_class.attached_object
     end
   end