From c7de69f0af052c6004ece6f961a64f7dfc84069d Mon Sep 17 00:00:00 2001
From: gogotanaka <mail@tanakakazuki.com>
Date: Sat, 31 Jan 2015 16:14:21 -0800
Subject: [PATCH 2/2] Add tests for math.c in the context of overriding
 Integer#to_f
To: https://bugs.ruby-lang.org/

---
 test/ruby/test_math.rb | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/test/ruby/test_math.rb b/test/ruby/test_math.rb
index a067aae..edc7edf 100644
--- a/test/ruby/test_math.rb
+++ b/test/ruby/test_math.rb
@@ -290,4 +290,41 @@ class TestMath < Test::Unit::TestCase

     assert_raise(Math::DomainError) { Math.lgamma(-Float::INFINITY) }
   end
+
+  def test_override_fixnum_to_f
+    Fixnum.class_eval do
+      alias _to_f to_f
+      def to_f
+       (self + 1)._to_f
+      end
+    end
+
+    check(Math.cos(1._to_f), Math.cos(0))
+    check(Math.exp(1._to_f), Math.exp(0))
+    check(Math.log(1._to_f), Math.log(0))
+
+    Fixnum.class_eval do
+      def to_f
+        _to_f
+      end
+    end
+  end
+
+  def test_override_bignum_to_f
+    Bignum.class_eval do
+      alias _to_f to_f
+      def to_f
+       (self << 1)._to_f
+      end
+    end
+
+    check(Math.cos((1 << 63)._to_f),  Math.cos(1 << 62))
+    check(Math.log((1 << 63)._to_f),  Math.log(1 << 62))
+
+    Bignum.class_eval do
+      def to_f
+        _to_f
+      end
+    end
+  end
 end
--
gogotanaka