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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
# This test cause SEGV.
def test_ungetc
r, w = IO.pipe
w.close
assert_raise(IOError, "[ruby-dev:31650]") { 20000.times { r.ungetc "a" } }
ensure
r.close
end
def test_each_byte
r, w = IO.pipe
w << "abc def"
w.close
r.each_byte {|byte| break if byte == 32 }
assert_equal("def", r.read, "[ruby-dev:31659]")
ensure
r.close
end
end
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