* string.c (tr_trans): should not be affected by the encoding of

  replacement unless actually modified.  [ruby-talk:328967]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index eba0256439..4bee19bca3 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -1395,6 +1395,9 @@ class TestString < Test::Unit::TestCase
     assert_equal(S("hippo"), S("hello").tr(S("el"), S("ip")))
     assert_equal(S("*e**o"), S("hello").tr(S("^aeiou"), S("*")))
     assert_equal(S("hal"),   S("ibm").tr(S("b-z"), S("a-z")))
+
+    a = "abc".force_encoding(Encoding::US_ASCII)
+    assert_equal(Encoding::US_ASCII, a.tr(S("z"), S("\u0101")).encoding)
   end
 
   def test_tr!
@@ -1415,6 +1418,10 @@ class TestString < Test::Unit::TestCase
     a = S("ibm")
     assert_nil(a.tr!(S("B-Z"), S("A-Z")))
     assert_equal(S("ibm"), a)
+
+    a = "abc".force_encoding(Encoding::US_ASCII)
+    assert_nil(a.tr!(S("z"), S("\u0101")))
+    assert_equal(Encoding::US_ASCII, a.encoding)
   end
 
   def test_tr_s