require 'test/unit'

class TestGc < Test::Unit::TestCase
  class S
    def initialize(a)
      @a = a
    end
  end

  def test_gc
    prev_stress = GC.stress
    GC.stress = false
    
    assert_nothing_raised do
      1.upto(10000) {
        tmp = [0,1,2,3,4,5,6,7,8,9]
      }
      tmp = nil
    end
    l=nil
    100000.times {
      l = S.new(l)
    }
    GC.start
    assert true   # reach here or dumps core
    l = []
    100000.times {
      l.push([l])
    }
    GC.start
    assert true   # reach here or dumps core

    GC.stress = prev_stress
  end

  def test_enable_disable
    GC.enable
    assert_equal(false, GC.enable)
    assert_equal(false, GC.disable)
    assert_equal(true, GC.disable)
    assert_equal(true, GC.disable)
    assert_nil(GC.start)
    assert_equal(true, GC.enable)
    assert_equal(false, GC.enable)
  ensure
    GC.enable
  end

  def test_count
    c = GC.count
    GC.start
    assert_operator(c, :<, GC.count)
  end
end