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require 'test/unit'
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, $$)
# read-only variable
assert_raises(NameError) do
$$ = 5
end
foobar = "foobar"
$_ = foobar
assert_equal(foobar, $_)
assert_equal("Cronus", Gods.new.ruler0)
assert_equal("Cronus", Gods.ruler1)
assert_equal("Cronus", Gods.ruler2)
assert_equal("Cronus", Titans.ruler1)
assert_equal("Cronus", Titans.ruler2)
atlas = Titans.new
assert_equal("Cronus", atlas.ruler0)
assert_equal("Zeus", atlas.ruler3)
end
end
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