File: test_trace.rb

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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
end