akr	2011-11-24 12:08:52 +0900 (Thu, 24 Nov 2011)

  New Revision: 33827

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=33827

  Log:
    add a test.

  Modified files:
    trunk/test/ruby/test_io.rb

Index: test/ruby/test_io.rb
===================================================================
--- test/ruby/test_io.rb	(revision 33826)
+++ test/ruby/test_io.rb	(revision 33827)
@@ -2122,4 +2122,39 @@
     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

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