From 7e35d6fcaa773afc4f492689471f5687cc41c814 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 24 Nov 2011 03:08:52 +0000
Subject: [PATCH] add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_io.rb | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index d877f5e832..af161eae26 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2122,4 +2122,39 @@ End
     end
     assert_equal(File.size(__FILE__), buf.unpack('i!')[0])
   end
+
+  def test_setpos
+    mkcdtmpdir {
+      File.open("tmp.txt", "w") {|f|
+        f.puts "a"
+        f.puts "bc"
+        f.puts "def"
+      }
+      pos1 = pos2 = pos3 = nil
+      File.open("tmp.txt") {|f|
+        assert_equal("a\n", f.gets)
+        pos1 = f.pos
+        assert_equal("bc\n", f.gets)
+        pos2 = f.pos
+        assert_equal("def\n", f.gets)
+        pos3 = f.pos
+        assert_equal(nil, f.gets)
+      }
+      File.open("tmp.txt") {|f|
+        f.pos = pos1
+        assert_equal("bc\n", f.gets)
+        assert_equal("def\n", f.gets)
+        assert_equal(nil, f.gets)
+      }
+      File.open("tmp.txt") {|f|
+        f.pos = pos2
+        assert_equal("def\n", f.gets)
+        assert_equal(nil, f.gets)
+      }
+      File.open("tmp.txt") {|f|
+        f.pos = pos3
+        assert_equal(nil, f.gets)
+      }
+    }
+  end
 end