* ext/stringio/stringio.c (strio_read): adjust behavior at reading

  beyond EOF to IO.  [ruby-dev:22205]

* test/ruby/ut_eof.rb (TestEOF::Seek): test behaviors at reading
  beyond EOF.

* test/ruby/test_file.rb, * test/stringio/test_stringio.rb:
  include TestEOF::Seek test case.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5158 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 27 insertions, 0 deletions

diff --git a/test/ruby/ut_eof.rb b/test/ruby/ut_eof.rb
index f1ce4f7198..ffd9ba65ab 100644
--- a/test/ruby/ut_eof.rb
+++ b/test/ruby/ut_eof.rb
@@ -53,4 +53,31 @@ module TestEOF
       assert_equal(nil, f.read(1))
     }
   end
+
+  module Seek
+    def open_file_seek(content, pos)
+      open_file(content) do |f|
+        f.seek(pos)
+        yield f
+      end
+    end
+
+    def test_eof_0_seek
+      open_file_seek("", 10) {|f|
+        assert_equal("", f.read)
+        assert_equal(nil, f.read)
+      }
+    end
+
+    def test_eof_1_seek
+      open_file_seek("a", 10) {|f|
+        assert_equal("", f.read)
+        assert_equal(nil, f.read)
+      }
+      open_file_seek("a", 1) {|f|
+        assert_equal("", f.read)
+        assert_equal(nil, f.read)
+      }
+    end
+  end
 end