RubyMotion/test/TestUnit/test/ruby/test_trace.rb

require 'test/unit'

class TestTrace < Test::Unit::TestCase
  def test_trace
    $x = 1234
    $y = 0
    trace_var :$x, proc{$y = $x}
    $x = 40414
    assert_equal($x, $y)

    untrace_var :$x
    $x = 19660208
    assert_not_equal($x, $y)

    trace_var :$x, proc{$x *= 2}
    $x = 5
    assert_equal(10, $x)

    untrace_var :$x
  end

  # def test_trace_tainted_proc
  #   skip("[BUG : #842] SecurityError Level 4")

  #   $x = 1234
  #   s = proc { $y = :foo }
  #   trace_var :$x, s
  #   s.taint
  #   $x = 42
  #   assert_equal(:foo, $y)
  # ensure
  #   untrace_var :$x
  # end

  def test_trace_proc_that_raises_exception
    $x = 1234
    trace_var :$x, proc { raise }
    assert_raise(RuntimeError) { $x = 42 }
  ensure
    untrace_var :$x
  end

  def test_trace_string
    $x = 1234
    trace_var :$x, "$y = :bar"
    $x = 42
    assert_equal(:bar, $y)
  ensure
    untrace_var :$x
  end

  # def test_trace_break
  #   bug2722 = '[ruby-core:31783]'
  #   a = Object.new.extend(Enumerable)
  #   def a.each
  #     yield
  #   end
  #   assert(Thread.start {
  #            Thread.current.add_trace_func(proc{})
  #            a.any? {true}
  #          }.value, bug2722)
  # end
end