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test_stringio.rb: add test

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* test/stringio/test_stringio.rb (test_ungetc_pos): add a test for
  r26588.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53180 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-12-18 03:05:53 +00:00
parent f211abcb9c
commit 07f53e4830
1 changed files with 10 additions and 0 deletions
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10
test/stringio/test_stringio.rb
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@ -572,6 +572,16 @@ class TestStringIO < Test::Unit::TestCase
end
end
def test_ungetc_padding
s = StringIO.new()
s.pos = 2
s.ungetc("a")
assert_equal("\0""a", s.string)
s.pos = 0
s.ungetc("b")
assert_equal("b""\0""a", s.string)
end
def test_frozen
s = StringIO.new
s.freeze