random.c: fix error message

* random.c (rb_random_ulong_limited): fix error message for negative
  value.  [ruby-dev:47061] [Bug #7903]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39376 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 15 insertions, 0 deletions

diff --git a/test/ruby/test_rand.rb b/test/ruby/test_rand.rb
index b482773c00..9fabfc607f 100644
--- a/test/ruby/test_rand.rb
+++ b/test/ruby/test_rand.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require_relative 'envutil'
 
 class TestRand < Test::Unit::TestCase
   def assert_random_int(ws, m, init = 0)
@@ -514,4 +515,18 @@ END
       l.call
     end
   end
+
+  def test_random_ulong_limited
+    def (gen = Object.new).rand(*) 1 end
+    assert_equal([2], (1..100).map {[1,2,3].sample(random: gen)}.uniq)
+
+    def (gen = Object.new).rand(*) 100 end
+    e = assert_raise(RangeError) {[1,2,3].sample(random: gen)}
+    assert_match(/big 100\z/, e.message)
+
+    bug7903 = '[ruby-dev:47061] [Bug #7903]'
+    def (gen = Object.new).rand(*) -1 end
+    e = assert_raise(RangeError) {[1,2,3].sample(random: gen)}
+    assert_match(/small -1\z/, e.message, bug7903)
+  end
 end