From 41c533446ffd10c25ef02cee0e7c5a4b1a69146c Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 5 Apr 2016 15:52:02 +0000
Subject: math.c: fix tgamma

* math.c (ruby_tgamma): fix tgamma(-0.0) on mingw.
  [ruby-core:74817] [Bug #12249]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_math.rb | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_math.rb b/test/ruby/test_math.rb
index e547cb77ec..c17b21a53d 100644
--- a/test/ruby/test_math.rb
+++ b/test/ruby/test_math.rb
@@ -255,6 +255,10 @@ class TestMath < Test::Unit::TestCase
     end
 
     assert_raise(Math::DomainError) { Math.gamma(-Float::INFINITY) }
+    x = Math.gamma(-0.0)
+    mesg = "Math.gamma(-0.0) should be -INF"
+    assert_infinity(x, mesg)
+    assert_predicate(x, :negative?, mesg)
   end
 
   def test_lgamma
-- 
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