* test/ruby/test_io.rb (test_gets_rs): add more tests.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7347 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_io.rb

@@ -2,10 +2,37 @@ require 'test/unit'
 
 class TestIO < Test::Unit::TestCase
   def test_gets_rs
+    # default_rs
+    r, w = IO.pipe
+    w.print "aaa\nbbb\n"
+    w.close
+    assert_equal "aaa\n", r.gets
+    assert_equal "bbb\n", r.gets
+    assert_nil r.gets
+    r.close
+
+    # nil
+    r, w = IO.pipe
+    w.print "a\n\nb\n\n"
+    w.close
+    assert_equal "a\n\nb\n\n", r.gets(nil)
+    assert_nil r.gets("")
+    r.close
+
+    # "\377" [ruby-dev:24460]
     r, w = IO.pipe
     w.print "\377xyz"
     w.close
     assert_equal("\377", r.gets("\377"), "[ruby-dev:24460]")
     r.close
+
+    # "" [ruby-core:03771]
+    r, w = IO.pipe
+    w.print "a\n\nb\n\n"
+    w.close
+    assert_equal "a\n\n", r.gets("")
+    assert_equal "b\n\n", r.gets("")
+    assert_nil r.gets("")
+    r.close
   end
 end