test/-ext-/string/test_modify_expand.rb


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# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
require "rbconfig/sizeof"

class Test_StringModifyExpand < Test::Unit::TestCase
  def test_modify_expand_memory_leak
    assert_no_memory_leak(["-r-test-/string"],
                          <<-PRE, <<-CMD, "rb_str_modify_expand()", limit: 2.5)
      s=Bug::String.new
    PRE
      size = $initial_size
      10.times{s.modify_expand!(size)}
      s.replace("")
    CMD
  end

  def test_integer_overflow
    bug12390 = '[ruby-core:75592] [Bug #12390]'
    s = Bug::String.new
    long_max = (1 << (8 * RbConfig::SIZEOF['long'] - 1)) - 1
    assert_raise(ArgumentError, bug12390) {
      s.modify_expand!(long_max)
    }
  end
end