2 files changed, 12 insertions, 1 deletions
diff --git a/test/minitest/test_minitest_unit.rb b/test/minitest/test_minitest_unit.rb
index 3d92b865c3..f59bc45c26 100644
--- a/test/minitest/test_minitest_unit.rb
+++ b/test/minitest/test_minitest_unit.rb
@@ -1529,7 +1529,9 @@ class TestMiniTestUnitTestCase < MiniTest::Unit::TestCase
   def test_refute_match_matcher_object
     @assertion_count = 2
     non_verbose do
-      @tc.refute_match Object.new, 5 # default #=~ returns false
+      obj = Object.new
+      def obj.=~(other); false; end
+      @tc.refute_match obj, 5
     end
   end
 
diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index 28e07162d7..0d31eb3ff0 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -946,4 +946,13 @@ class TestObject < Test::Unit::TestCase
       end
     EOS
   end
+
+  def test_matcher
+    assert_warning(/deprecated Object#=~ is called on Object/) do
+      assert_equal(Object.new =~ 42, nil)
+    end
+    assert_warning(/deprecated Object#=~ is called on Array/) do
+      assert_equal([] =~ 42, nil)
+    end
+  end
 end