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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
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