diff --git a/test/ruby/test_class.rb b/test/ruby/test_class.rb
index 7e072c27b7..055ddca629 100644
--- a/test/ruby/test_class.rb
+++ b/test/ruby/test_class.rb
@@ -106,13 +106,14 @@ class TestClass < Test::Unit::TestCase
   end
 
   def test_method_redefinition
+    line = __LINE__+4
     stderr = EnvUtil.verbose_warning do
       Class.new do
         def foo; end
         def foo; end
       end
     end
-    assert_match(/method redefined; discarding old foo/, stderr)
+    assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)
 
     stderr = EnvUtil.verbose_warning do
       Class.new do
@@ -132,6 +133,7 @@ class TestClass < Test::Unit::TestCase
     end
     assert_equal("", stderr)
 
+    line = __LINE__+4
     stderr = EnvUtil.verbose_warning do
       Class.new do
         define_method(:foo) do end
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 8829a3dcf1..bfb347c468 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -788,13 +788,23 @@ class TestModule < Test::Unit::TestCase
   end
 
   def test_method_redefinition
+    line = __LINE__+4
     stderr = EnvUtil.verbose_warning do
       Module.new do
         def foo; end
         def foo; end
       end
     end
-    assert_match(/method redefined; discarding old foo/, stderr)
+    assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)
+
+    stderr = EnvUtil.verbose_warning do
+      Module.new do
+        def foo; end
+        alias bar foo
+        def foo; end
+      end
+    end
+    assert_equal("", stderr)
 
     stderr = EnvUtil.verbose_warning do
       Module.new do
@@ -805,6 +815,24 @@ class TestModule < Test::Unit::TestCase
     end
     assert_equal("", stderr)
 
+    line = __LINE__+4
+    stderr = EnvUtil.verbose_warning do
+      Module.new do
+        define_method(:foo) do end
+        def foo; end
+      end
+    end
+    assert_match(/:#{line}: warning: method redefined; discarding old foo/, stderr)
+
+    stderr = EnvUtil.verbose_warning do
+      Module.new do
+        define_method(:foo) do end
+        alias bar foo
+        alias barf oo
+      end
+    end
+    assert_equal("", stderr)
+
     stderr = EnvUtil.verbose_warning do
       Module.new do
         module_function