From fd8df3ab3d935b4a201f9cb28598c95e4bb1ef14 Mon Sep 17 00:00:00 2001
From: eregon <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 25 May 2017 15:33:28 +0000
Subject: Raise ArgumentError if sprintf format string ends with %

* Add tests and specs. See ruby/spec#401.
  Patch by Yuta Iwama and Shintaro Morikawa.
  [ruby-core:80153] [Bug #13315] [Fix GH-1560]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58890 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_sprintf.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_sprintf.rb b/test/ruby/test_sprintf.rb
index 1bf65f1eab..f58686d93d 100644
--- a/test/ruby/test_sprintf.rb
+++ b/test/ruby/test_sprintf.rb
@@ -424,6 +424,16 @@ class TestSprintf < Test::Unit::TestCase
     assert_equal("%" * BSIZ, sprintf("%%" * BSIZ))
   end
 
+  def test_percent_sign_at_end
+    assert_raise_with_message(ArgumentError, "incomplete format specifier") do
+      sprintf("%")
+    end
+
+    assert_raise_with_message(ArgumentError, "incomplete format specifier") do
+      sprintf("abc%")
+    end
+  end
+
   def test_rb_sprintf
     assert_match(/^#<TestSprintf::T012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789:0x[0-9a-f]+>$/,
                  T012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789.new.inspect)
-- 
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