From 865313dfac2f865c9a0d5855b11797d2ec4347c6 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 24 Nov 2018 12:48:56 +0000
Subject: [PATCH] assertions for r65956

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65959 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_string.rb | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 014eb5ec15..ffae04bc21 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -987,6 +987,7 @@ CODE
     ].each do |g|
       assert_equal [g], g.each_grapheme_cluster.to_a
       assert_equal 1, g.each_grapheme_cluster.size
+      assert_predicate g.dup.taint.each_grapheme_cluster.to_a[0], :tainted?
     end
 
     [
@@ -996,6 +997,9 @@ CODE
     ].each do |str, grapheme_clusters|
       assert_equal grapheme_clusters, str.each_grapheme_cluster.to_a
       assert_equal grapheme_clusters.size, str.each_grapheme_cluster.size
+      str.dup.taint.each_grapheme_cluster do |g|
+        assert_predicate g, :tainted?
+      end
     end
 
     s = ("x"+"\u{10ABCD}"*250000)
@@ -1016,6 +1020,7 @@ CODE
       "\u{1f469 200d 2764 fe0f 200d 1f469}",
     ].each do |g|
       assert_equal [g], g.grapheme_clusters
+      assert_predicate g.dup.taint.grapheme_clusters[0], :tainted?
     end
 
     assert_equal ["\u000A", "\u0308"], "\u{a 308}".grapheme_clusters
@@ -1029,12 +1034,14 @@ CODE
     else
       warning = /passing a block to String#grapheme_clusters is deprecated/
       assert_warning(warning) {
-        s = "ABC".b
+        s = "ABC".b.taint
         res = []
         assert_same s, s.grapheme_clusters {|x| res << x }
+        assert_equal(3, res.size)
         assert_equal("A", res[0])
         assert_equal("B", res[1])
         assert_equal("C", res[2])
+        res.each {|g| assert_predicate(g, :tainted?)}
       }
     end
   end