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require 'test/unit'
$KCODE = 'none'
class TestVariable < Test::Unit::TestCase
class Gods
@@rule = "Uranus"
def ruler0
@@rule
end
def self.ruler1 # <= per method definition style
@@rule
end
class << self # <= multiple method definition style
def ruler2
@@rule
end
end
end
module Olympians
@@rule ="Zeus"
def ruler3
@@rule
end
end
class Titans < Gods
@@rule = "Cronus"
include Olympians # OK to cause warning (intentional)
end
def test_variable
assert($$.instance_of?(Fixnum))
# read-only variable
begin
$$ = 5
assert false
rescue NameError
assert true
end
foobar = "foobar"
$_ = foobar
assert($_ == foobar)
assert(Gods.new.ruler0 == "Cronus")
assert(Gods.ruler1 == "Cronus")
assert(Gods.ruler2 == "Cronus")
assert(Titans.ruler1 == "Cronus")
assert(Titans.ruler2 == "Cronus")
atlas = Titans.new
assert(atlas.ruler0 == "Cronus")
assert(atlas.ruler3 == "Zeus")
end
end
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