round-down

* numeric.c (round_half_down, int_round_half_down): support
  round-down mode.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56897 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 21 insertions, 0 deletions

diff --git a/test/test_mathn.rb b/test/test_mathn.rb
index 2ea049502c..bafc4c8dbc 100644
--- a/test/test_mathn.rb
+++ b/test/test_mathn.rb
@@ -157,6 +157,27 @@ class TestMathn < Test::Unit::TestCase
       assert_equal((-12/5), (-12/5).round(2, half: :up))
       assert_equal(( -5/2), ( -5/2).round(2, half: :up))
       assert_equal((-13/5), (-13/5).round(2, half: :up))
+
+      assert_equal( 3, ( 13/5).round(half: :down))
+      assert_equal( 2, (  5/2).round(half: :down))
+      assert_equal( 2, ( 12/5).round(half: :down))
+      assert_equal(-2, (-12/5).round(half: :down))
+      assert_equal(-2, ( -5/2).round(half: :down))
+      assert_equal(-3, (-13/5).round(half: :down))
+
+      assert_equal( 3, ( 13/5).round(0, half: :down))
+      assert_equal( 2, (  5/2).round(0, half: :down))
+      assert_equal( 2, ( 12/5).round(0, half: :down))
+      assert_equal(-2, (-12/5).round(0, half: :down))
+      assert_equal(-2, ( -5/2).round(0, half: :down))
+      assert_equal(-3, (-13/5).round(0, half: :down))
+
+      assert_equal(( 13/5), ( 13/5).round(2, half: :down))
+      assert_equal((  5/2), (  5/2).round(2, half: :down))
+      assert_equal(( 12/5), ( 12/5).round(2, half: :down))
+      assert_equal((-12/5), (-12/5).round(2, half: :down))
+      assert_equal(( -5/2), ( -5/2).round(2, half: :down))
+      assert_equal((-13/5), (-13/5).round(2, half: :down))
     EOS
   end
 end