* test/ruby/test_string.rb: added testcase for next!, succ and succ!

  [fix GH-1213] Patch by @K0mAtoru

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53649 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 23 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 186b83c2cc..1e76787c8a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jan 25 09:38:26 2016  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* test/ruby/test_string.rb: added testcase for next!, succ and succ!
+	  [fix GH-1213] Patch by @K0mAtoru
+
 Mon Jan 25 09:32:25 2016  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
 	* lib/webrick/httpservlet/filehandler.rb: fix documentation for namespace.
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 7eed784c8a..f1633e3d7b 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -995,6 +995,9 @@ class TestString < Test::Unit::TestCase
     assert_equal(S("AAAAA000"), S("ZZZZ999").next)
 
     assert_equal(S("*+"), S("**").next)
+
+    assert_equal(S("!"), S(" ").next)
+    assert_equal(S(""), S("").next)
   end
 
   def test_next!
@@ -1031,6 +1034,10 @@ class TestString < Test::Unit::TestCase
     a = S("**")
     assert_equal(S("*+"), a.next!)
     assert_equal(S("*+"), a)
+
+    a = S(" ")
+    assert_equal(S("!"), a.next!)
+    assert_equal(S("!"), a)
   end
 
   def test_oct
@@ -1541,6 +1548,9 @@ class TestString < Test::Unit::TestCase
     assert_equal("2000aaa", "1999zzz".succ)
     assert_equal("AAAA0000", "ZZZ9999".succ)
     assert_equal("**+", "***".succ)
+
+    assert_equal("!", " ".succ)
+    assert_equal("", "".succ)
   end
 
   def test_succ!
@@ -1582,6 +1592,14 @@ class TestString < Test::Unit::TestCase
     assert_equal(S("No.10"), a.succ!)
     assert_equal(S("No.10"), a)
 
+    a = S(" ")
+    assert_equal(S("!"), a.succ!)
+    assert_equal(S("!"), a)
+
+    a = S("")
+    assert_equal(S(""), a.succ!)
+    assert_equal(S(""), a)
+
     assert_equal("aaaaaaaaaaaa", "zzzzzzzzzzz".succ!)
     assert_equal("aaaaaaaaaaaaaaaaaaaaaaaa", "zzzzzzzzzzzzzzzzzzzzzzz".succ!)
   end