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require 'test/unit'
class TestNilClass < Test::Unit::TestCase
# FIXME: This should be moved to a common location.
def truth_table(method, *result)
for a in [ false, true ]
expected = result.shift
assert_equal(expected, method.call(a))
assert_equal(expected, method.call(a ? self : nil))
end
end
def test_and # '&'
truth_table(nil.method("&"), false, false)
end
def sideEffect
$global = 1
end
def test_or # '|'
truth_table(nil.method("|"), false, true)
$global = 0
assert_equal(true, nil | sideEffect)
assert_equal(1, $global)
end
def test_carat # '^'
truth_table(nil.method("^"), false, true)
$global = 0
assert_equal(true, nil ^ sideEffect)
assert_equal(1, $global)
end
def test_nil?
assert(nil.nil?)
end
def test_to_a
assert_equal([], nil.to_a)
end
def test_to_i
assert_equal(0, nil.to_i)
end
def test_to_s
assert_equal("", nil.to_s)
end
def test_to_f
assert_equal(0.0, nil.to_f)
end
end
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