test/ruby: suppress runtime warnings

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53873 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 3 deletions

diff --git a/test/ruby/test_math.rb b/test/ruby/test_math.rb
index f2805a2d74..72ed987719 100644
--- a/test/ruby/test_math.rb
+++ b/test/ruby/test_math.rb
@@ -289,7 +289,7 @@ class TestMath < Test::Unit::TestCase
     check(Math.exp((0 + 1)._to_f), Math.exp(0))
     check(Math.log((0 + 1)._to_f), Math.log(0))
 
-    Fixnum.class_eval { alias to_f _to_f }
+    Fixnum.class_eval { undef to_f; alias to_f _to_f; undef _to_f }
   end
 
   def test_bignum_to_f
@@ -307,7 +307,7 @@ class TestMath < Test::Unit::TestCase
     check(Math.cos((1 << 62 << 1)._to_f),  Math.cos(1 << 62))
     check(Math.log((1 << 62 << 1)._to_f),  Math.log(1 << 62))
 
-    Bignum.class_eval { alias to_f _to_f }
+    Bignum.class_eval { undef to_f; alias to_f _to_f; undef _to_f }
   end
 
   def test_rational_to_f
@@ -326,6 +326,6 @@ class TestMath < Test::Unit::TestCase
     check(Math.exp((0r + 1)._to_f), Math.exp(0r))
     check(Math.log((0r + 1)._to_f), Math.log(0r))
 
-    Rational.class_eval { alias to_f _to_f }
+    Rational.class_eval { undef to_f; alias to_f _to_f; undef _to_f }
   end
 end