From 3586aef4b8a18fca685f883c80367a80182b943e Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 29 Dec 2015 23:44:01 +0000
Subject: test_stringio.rb: test_initialize

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

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53378 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/stringio/test_stringio.rb | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'test/stringio')

diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index 9a041c2148..77a98726d8 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -13,6 +13,27 @@ class TestStringIO < Test::Unit::TestCase
 
   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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