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Add regression test for mutating pack's format string

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It doesn't look like there was a test added for this bug, so I'm adding
it.

Code is from here:

  https://web.archive.org/web/20160908192307/http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/24445
This commit is contained in:
Aaron Patterson 2024-07-02 17:17:29 -07:00 committed by Aaron Patterson
parent d9487dd011
commit 93b19d56de
1 changed files with 11 additions and 0 deletions
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11
test/ruby/test_array.rb
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@ -1215,6 +1215,17 @@ class TestArray < Test::Unit::TestCase
assert_equal(@cls[], a) assert_equal(@cls[], a)
end end
def test_pack_format_mutation
ary = [Object.new]
fmt = "c" * 0x20000
class << ary[0]; self end.send(:define_method, :to_int) {
fmt.replace ""
1
}
e = assert_raise(RuntimeError) { ary.pack(fmt) }
assert_equal "format string modified", e.message
end
def test_pack def test_pack
a = @cls[*%w( cat wombat x yy)] a = @cls[*%w( cat wombat x yy)]
assert_equal("catwomx yy ", a.pack("A3A3A3A3")) assert_equal("catwomx yy ", a.pack("A3A3A3A3"))