nobu	2015-12-30 08:44:01 +0900 (Wed, 30 Dec 2015)

  New Revision: 53378

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=53378

  Log:
    test_stringio.rb: test_initialize
    
    * test/stringio/test_stringio.rb (test_initialize): add test for
      StringIO#initialize.  [ruby-core:72585] [Feature #11920]

  Modified files:
    trunk/ChangeLog
    trunk/test/stringio/test_stringio.rb
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 53377)
+++ ChangeLog	(revision 53378)
@@ -1,3 +1,8 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Wed Dec 30 08:43:59 2015  Yuki Kurihara  <co000ri@g...>
+
+	* test/stringio/test_stringio.rb (test_initialize): add test for
+	  StringIO#initialize.  [ruby-core:72585] [Feature #11920]
+
 Wed Dec 30 05:19:24 2015  Eric Wong  <e@8...>
 
 	* class.c (struct clone_const_arg): adjust for id_table
Index: test/stringio/test_stringio.rb
===================================================================
--- test/stringio/test_stringio.rb	(revision 53377)
+++ test/stringio/test_stringio.rb	(revision 53378)
@@ -13,6 +13,27 @@ class TestStringIO < Test::Unit::TestCas https://github.com/ruby/ruby/blob/trunk/test/stringio/test_stringio.rb#L13
 
   include TestEOF::Seek
 
+  def test_initialize
+    assert_kind_of StringIO, StringIO.new
+    assert_kind_of StringIO, StringIO.new('str')
+    assert_kind_of StringIO, StringIO.new('str', 'r+')
+    assert_raise(ArgumentError) { StringIO.new('', 'x') }
+    assert_raise(ArgumentError) { StringIO.new('', 'rx') }
+    assert_raise(ArgumentError) { StringIO.new('', 'rbt') }
+    assert_raise(TypeError) { StringIO.new(nil) }
+    assert_raise(TypeError) { StringIO.new('str', nil) }
+
+    o = Object.new
+    def o.to_str
+      nil
+    end
+    assert_raise(TypeError) { StringIO.new(o) }
+    def o.to_str
+      'str'
+    end
+    assert_kind_of StringIO, StringIO.new(o)
+  end
+
   def test_truncate
     io = StringIO.new("")
     io.puts "abc"

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