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test_assignment.rb
467 lines (416 loc) · 19 KB
/
test_assignment.rb
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require 'test/unit'
class TestAssignment < Test::Unit::TestCase
def test_assign
a=[]; a[0] ||= "bar";
assert_equal("bar", a[0])
h={}; h["foo"] ||= "bar";
assert_equal("bar", h["foo"])
aa = 5
aa ||= 25
assert_equal(5, aa)
bb ||= 25
assert_equal(25, bb)
cc &&=33
assert_nil(cc)
cc = 5
cc &&=44
assert_equal(44, cc)
a = nil; assert_nil(a)
a = 1; assert_equal(1, a)
a = []; assert_equal([], a)
a = [1]; assert_equal([1], a)
a = [nil]; assert_equal([nil], a)
a = [[]]; assert_equal([[]], a)
a = [1,2]; assert_equal([1,2], a)
a = [*[]]; assert_equal([], a)
a = [*[1]]; assert_equal([1], a)
a = [*[1,2]]; assert_equal([1,2], a)
a = *nil; assert_nil(a)
a = *1; assert_equal(1, a)
a = *[]; assert_nil(a)
a = *[1]; assert_equal(1, a)
a = *[nil]; assert_nil(a)
a = *[[]]; assert_equal([], a)
a = *[1,2]; assert_equal([1,2], a)
a = *[*[]]; assert_nil(a)
a = *[*[1]]; assert_equal(1, a)
a = *[*[1,2]]; assert_equal([1,2], a)
*a = nil; assert_equal([nil], a)
*a = 1; assert_equal([1], a)
*a = []; assert_equal([[]], a)
*a = [1]; assert_equal([[1]], a)
*a = [nil]; assert_equal([[nil]], a)
*a = [[]]; assert_equal([[[]]], a)
*a = [1,2]; assert_equal([[1,2]], a)
*a = [*[]]; assert_equal([[]], a)
*a = [*[1]]; assert_equal([[1]], a)
*a = [*[1,2]]; assert_equal([[1,2]], a)
*a = *nil; assert_equal([nil], a)
*a = *1; assert_equal([1], a)
*a = *[]; assert_equal([], a)
*a = *[1]; assert_equal([1], a)
*a = *[nil]; assert_equal([nil], a)
*a = *[[]]; assert_equal([[]], a)
*a = *[1,2]; assert_equal([1,2], a)
*a = *[*[]]; assert_equal([], a)
*a = *[*[1]]; assert_equal([1], a)
*a = *[*[1,2]]; assert_equal([1,2], a)
a,b,*c = nil; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = 1; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = []; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = [1]; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = [nil]; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = [[]]; assert_equal([[],nil,[]], [a,b,c])
a,b,*c = [1,2]; assert_equal([1,2,[]], [a,b,c])
a,b,*c = [*[]]; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = [*[1]]; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = [*[1,2]]; assert_equal([1,2,[]], [a,b,c])
a,b,*c = *nil; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = *1; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = *[]; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = *[1]; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = *[nil]; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = *[[]]; assert_equal([[],nil,[]], [a,b,c])
a,b,*c = *[1,2]; assert_equal([1,2,[]], [a,b,c])
a,b,*c = *[*[]]; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = *[*[1]]; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = *[*[1,2]]; assert_equal([1,2,[]], [a,b,c])
end
def test_yield
def f; yield nil; end; f {|a| assert_nil(a)}
def f; yield 1; end; f {|a| assert_equal(1, a)}
def f; yield []; end; f {|a| assert_equal([], a)}
def f; yield [1]; end; f {|a| assert_equal([1], a)}
def f; yield [nil]; end; f {|a| assert_equal([nil], a)}
def f; yield [[]]; end; f {|a| assert_equal([[]], a)}
def f; yield [*[]]; end; f {|a| assert_equal([], a)}
def f; yield [*[1]]; end; f {|a| assert_equal([1], a)}
def f; yield [*[1,2]]; end; f {|a| assert_equal([1,2], a)}
def f; yield *nil; end; f {|a| assert_nil(a)}
def f; yield *1; end; f {|a| assert_equal(1, a)}
def f; yield *[1]; end; f {|a| assert_equal(1, a)}
def f; yield *[nil]; end; f {|a| assert_nil(a)}
def f; yield *[[]]; end; f {|a| assert_equal([], a)}
def f; yield *[*[1]]; end; f {|a| assert_equal(1, a)}
def f; yield; end; f {|*a| assert_equal([], a)}
def f; yield nil; end; f {|*a| assert_equal([nil], a)}
def f; yield 1; end; f {|*a| assert_equal([1], a)}
def f; yield []; end; f {|*a| assert_equal([[]], a)}
def f; yield [1]; end; f {|*a| assert_equal([[1]], a)}
def f; yield [nil]; end; f {|*a| assert_equal([[nil]], a)}
def f; yield [[]]; end; f {|*a| assert_equal([[[]]], a)}
def f; yield [1,2]; end; f {|*a| assert_equal([[1,2]], a)}
def f; yield [*[]]; end; f {|*a| assert_equal([[]], a)}
def f; yield [*[1]]; end; f {|*a| assert_equal([[1]], a)}
def f; yield [*[1,2]]; end; f {|*a| assert_equal([[1,2]], a)}
def f; yield *nil; end; f {|*a| assert_equal([nil], a)}
def f; yield *1; end; f {|*a| assert_equal([1], a)}
def f; yield *[]; end; f {|*a| assert_equal([], a)}
def f; yield *[1]; end; f {|*a| assert_equal([1], a)}
def f; yield *[nil]; end; f {|*a| assert_equal([nil], a)}
def f; yield *[[]]; end; f {|*a| assert_equal([[]], a)}
def f; yield *[*[]]; end; f {|*a| assert_equal([], a)}
def f; yield *[*[1]]; end; f {|*a| assert_equal([1], a)}
def f; yield *[*[1,2]]; end; f {|*a| assert_equal([1,2], a)}
def f; yield; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield nil; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield 1; end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}
def f; yield []; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield [1]; end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}
def f; yield [nil]; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield [[]]; end; f {|a,b,*c| assert_equal([[],nil,[]], [a,b,c])}
def f; yield [*[]]; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield [*[1]]; end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}
def f; yield [*[1,2]]; end; f {|a,b,*c| assert_equal([1,2,[]], [a,b,c])}
def f; yield *nil; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield *1; end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}
def f; yield *[]; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield *[1]; end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}
def f; yield *[nil]; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield *[[]]; end; f {|a,b,*c| assert_equal([[],nil,[]], [a,b,c])}
def f; yield *[*[]]; end; f {|a,b,*c| assert_equal([nil,nil,[]], [a,b,c])}
def f; yield *[*[1]]; end; f {|a,b,*c| assert_equal([1,nil,[]], [a,b,c])}
def f; yield *[*[1,2]]; end; f {|a,b,*c| assert_equal([1,2,[]], [a,b,c])}
end
def test_return
def r; return; end; a = r(); assert_nil(a)
def r; return nil; end; a = r(); assert_nil(a)
def r; return 1; end; a = r(); assert_equal(1, a)
def r; return []; end; a = r(); assert_equal([], a)
def r; return [1]; end; a = r(); assert_equal([1], a)
def r; return [nil]; end; a = r(); assert_equal([nil], a)
def r; return [[]]; end; a = r(); assert_equal([[]], a)
def r; return [*[]]; end; a = r(); assert_equal([], a)
def r; return [*[1]]; end; a = r(); assert_equal([1], a)
def r; return [*[1,2]]; end; a = r(); assert_equal([1,2], a)
def r; return *nil; end; a = r(); assert_nil(a)
def r; return *1; end; a = r(); assert_equal(1, a)
def r; return *[]; end; a = r(); assert_nil(a)
def r; return *[1]; end; a = r(); assert_equal(1, a)
def r; return *[nil]; end; a = r(); assert_nil(a)
def r; return *[[]]; end; a = r(); assert_equal([], a)
def r; return *[*[]]; end; a = r(); assert_nil(a)
def r; return *[*[1]]; end; a = r(); assert_equal(1, a)
def r; return *[*[1,2]]; end; a = r(); assert_equal([1,2], a)
def r; return *nil; end; a = *r(); assert_nil(a)
def r; return *1; end; a = *r(); assert_equal(1, a)
def r; return *[]; end; a = *r(); assert_nil(a)
def r; return *[1]; end; a = *r(); assert_equal(1, a)
def r; return *[nil]; end; a = *r(); assert_nil(a)
def r; return *[[]]; end; a = *r(); assert_nil(a)
def r; return *[*[]]; end; a = *r(); assert_nil(a)
def r; return *[*[1]]; end; a = *r(); assert_equal(1, a)
def r; return *[*[1,2]]; end; a = *r(); assert_equal([1,2], a)
def r; return; end; *a = r(); assert_equal([nil], a)
def r; return nil; end; *a = r(); assert_equal([nil], a)
def r; return 1; end; *a = r(); assert_equal([1], a)
def r; return []; end; *a = r(); assert_equal([[]], a)
def r; return [1]; end; *a = r(); assert_equal([[1]], a)
def r; return [nil]; end; *a = r(); assert_equal([[nil]], a)
def r; return [[]]; end; *a = r(); assert_equal([[[]]], a)
def r; return [1,2]; end; *a = r(); assert_equal([[1,2]], a)
def r; return [*[]]; end; *a = r(); assert_equal([[]], a)
def r; return [*[1]]; end; *a = r(); assert_equal([[1]], a)
def r; return [*[1,2]]; end; *a = r(); assert_equal([[1,2]], a)
def r; return *nil; end; *a = r(); assert_equal([nil], a)
def r; return *1; end; *a = r(); assert_equal([1], a)
def r; return *[]; end; *a = r(); assert_equal([nil], a)
def r; return *[1]; end; *a = r(); assert_equal([1], a)
def r; return *[nil]; end; *a = r(); assert_equal([nil], a)
def r; return *[[]]; end; *a = r(); assert_equal([[]], a)
def r; return *[1,2]; end; *a = r(); assert_equal([[1,2]], a)
def r; return *[*[]]; end; *a = r(); assert_equal([nil], a)
def r; return *[*[1]]; end; *a = r(); assert_equal([1], a)
def r; return *[*[1,2]]; end; *a = r(); assert_equal([[1,2]], a)
def r; return *nil; end; *a = *r(); assert_equal([nil], a)
def r; return *1; end; *a = *r(); assert_equal([1], a)
def r; return *[]; end; *a = *r(); assert_equal([nil], a)
def r; return *[1]; end; *a = *r(); assert_equal([1], a)
def r; return *[nil]; end; *a = *r(); assert_equal([nil], a)
def r; return *[[]]; end; *a = *r(); assert_equal([], a)
def r; return *[1,2]; end; *a = *r(); assert_equal([1,2], a)
def r; return *[*[]]; end; *a = *r(); assert_equal([nil], a)
def r; return *[*[1]]; end; *a = *r(); assert_equal([1], a)
def r; return *[*[1,2]]; end; *a = *r(); assert_equal([1,2], a)
def r; return; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return nil; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return 1; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c])
def r; return []; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return [1]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c])
def r; return [nil]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return [[]]; end; a,b,*c = r(); assert_equal([[],nil,[]], [a,b,c])
def r; return [1,2]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c])
def r; return [*[]]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return [*[1]]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c])
def r; return [*[1,2]]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c])
def r; return *nil; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return *1; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c])
def r; return *[]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return *[1]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c])
def r; return *[nil]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return *[[]]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return *[1,2]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c])
def r; return *[*[]]; end; a,b,*c = r(); assert_equal([nil,nil,[]], [a,b,c])
def r; return *[*[1]]; end; a,b,*c = r(); assert_equal([1,nil,[]], [a,b,c])
def r; return *[*[1,2]]; end; a,b,*c = r(); assert_equal([1,2,[]], [a,b,c])
end
def test_lambda
f = lambda {|r,| assert_equal([], r)}
f.call([], *[])
f = lambda {|r,*l| assert_equal([], r); assert_equal([1], l)}
f.call([], *[1])
f = lambda{|x| x}
assert_equal(42, f.call(42))
assert_equal([42], f.call([42]))
assert_equal([[42]], f.call([[42]]))
assert_equal([42,55], f.call([42,55]))
f = lambda{|x,| x}
assert_equal(42, f.call(42))
assert_equal([42], f.call([42]))
assert_equal([[42]], f.call([[42]]))
assert_equal([42,55], f.call([42,55]))
f = lambda{|*x| x}
assert_equal([42], f.call(42))
assert_equal([[42]], f.call([42]))
assert_equal([[[42]]], f.call([[42]]))
assert_equal([[42,55]], f.call([42,55]))
assert_equal([42,55], f.call(42,55))
end
def test_multi
a,=*[1]
assert_equal(1, a)
a,=*[[1]]
assert_equal([1], a)
a,=*[[[1]]]
assert_equal([[1]], a)
x, (y, z) = 1, 2, 3
assert_equal([1,2,nil], [x,y,z])
x, (y, z) = 1, [2,3]
assert_equal([1,2,3], [x,y,z])
x, (y, z) = 1, [2]
assert_equal([1,2,nil], [x,y,z])
end
def test_break
a = loop do break; end; assert_nil(a)
a = loop do break nil; end; assert_nil(a)
a = loop do break 1; end; assert_equal(1, a)
a = loop do break []; end; assert_equal([], a)
a = loop do break [1]; end; assert_equal([1], a)
a = loop do break [nil]; end; assert_equal([nil], a)
a = loop do break [[]]; end; assert_equal([[]], a)
a = loop do break [*[]]; end; assert_equal([], a)
a = loop do break [*[1]]; end; assert_equal([1], a)
a = loop do break [*[1,2]]; end; assert_equal([1,2], a)
a = loop do break *nil; end; assert_nil(a)
a = loop do break *1; end; assert_equal(1, a)
a = loop do break *[]; end; assert_nil(a)
a = loop do break *[1]; end; assert_equal(1, a)
a = loop do break *[nil]; end; assert_nil(a)
a = loop do break *[[]]; end; assert_equal([], a)
a = loop do break *[*[]]; end; assert_nil(a)
a = loop do break *[*[1]]; end; assert_equal(1, a)
a = loop do break *[*[1,2]]; end; assert_equal([1,2], a)
*a = loop do break; end; assert_equal([nil], a)
*a = loop do break nil; end; assert_equal([nil], a)
*a = loop do break 1; end; assert_equal([1], a)
*a = loop do break []; end; assert_equal([[]], a)
*a = loop do break [1]; end; assert_equal([[1]], a)
*a = loop do break [nil]; end; assert_equal([[nil]], a)
*a = loop do break [[]]; end; assert_equal([[[]]], a)
*a = loop do break [1,2]; end; assert_equal([[1,2]], a)
*a = loop do break [*[]]; end; assert_equal([[]], a)
*a = loop do break [*[1]]; end; assert_equal([[1]], a)
*a = loop do break [*[1,2]]; end; assert_equal([[1,2]], a)
*a = loop do break *nil; end; assert_equal([nil], a)
*a = loop do break *1; end; assert_equal([1], a)
*a = loop do break *[]; end; assert_equal([nil], a)
*a = loop do break *[1]; end; assert_equal([1], a)
*a = loop do break *[nil]; end; assert_equal([nil], a)
*a = loop do break *[[]]; end; assert_equal([[]], a)
*a = loop do break *[1,2]; end; assert_equal([[1,2]], a)
*a = loop do break *[*[]]; end; assert_equal([nil], a)
*a = loop do break *[*[1]]; end; assert_equal([1], a)
*a = loop do break *[*[1,2]]; end; assert_equal([[1,2]], a)
*a = *loop do break *nil; end; assert_equal([nil], a)
*a = *loop do break *1; end; assert_equal([1], a)
*a = *loop do break *[]; end; assert_equal([nil], a)
*a = *loop do break *[1]; end; assert_equal([1], a)
*a = *loop do break *[nil]; end; assert_equal([nil], a)
*a = *loop do break *[[]]; end; assert_equal([], a)
*a = *loop do break *[1,2]; end; assert_equal([1,2], a)
*a = *loop do break *[*[]]; end; assert_equal([nil], a)
*a = *loop do break *[*[1]]; end; assert_equal([1], a)
*a = *loop do break *[*[1,2]]; end; assert_equal([1,2], a)
a,b,*c = loop do break; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break nil; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break 1; end; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = loop do break []; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break [1]; end; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = loop do break [nil]; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break [[]]; end; assert_equal([[],nil,[]], [a,b,c])
a,b,*c = loop do break [1,2]; end; assert_equal([1,2,[]], [a,b,c])
a,b,*c = loop do break [*[]]; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break [*[1]]; end; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = loop do break [*[1,2]]; end; assert_equal([1,2,[]], [a,b,c])
a,b,*c = loop do break *nil; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break *1; end; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = loop do break *[]; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break *[1]; end; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = loop do break *[nil]; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break *[[]]; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break *[1,2]; end; assert_equal([1,2,[]], [a,b,c])
a,b,*c = loop do break *[*[]]; end; assert_equal([nil,nil,[]], [a,b,c])
a,b,*c = loop do break *[*[1]]; end; assert_equal([1,nil,[]], [a,b,c])
a,b,*c = loop do break *[*[1,2]]; end; assert_equal([1,2,[]], [a,b,c])
end
def test_next
def r(val); a = yield(); assert_equal(val, a); end
r(nil){next}
r(nil){next nil}
r(1){next 1}
r([]){next []}
r([1]){next [1]}
r([nil]){next [nil]}
r([[]]){next [[]]}
r([]){next [*[]]}
r([1]){next [*[1]]}
r([1,2]){next [*[1,2]]}
r(nil){next *nil}
r(1){next *1}
r(nil){next *[]}
r(1){next *[1]}
r(nil){next *[nil]}
r([]){next *[[]]}
r(nil){next *[*[]]}
r(1){next *[*[1]]}
r([1,2]){next *[*[1,2]]}
def r(val); *a = yield(); assert_equal(val, a); end
r([nil]){next}
r([nil]){next nil}
r([1]){next 1}
r([[]]){next []}
r([[1]]){next [1]}
r([[nil]]){next [nil]}
r([[[]]]){next [[]]}
r([[1,2]]){next [1,2]}
r([[]]){next [*[]]}
r([[1]]){next [*[1]]}
r([[1,2]]){next [*[1,2]]}
def r(val); *a = *yield(); assert_equal(val, a); end
r([nil]){next *nil}
r([1]){next *1}
r([nil]){next *[]}
r([1]){next *[1]}
r([nil]){next *[nil]}
r([]){next *[[]]}
r([1,2]){next *[1,2]}
r([nil]){next *[*[]]}
r([1]){next *[*[1]]}
r([1,2]){next *[*[1,2]]}
def r(val); a,b,*c = yield(); assert_equal(val, [a,b,c]); end
r([nil,nil,[]]){next}
r([nil,nil,[]]){next nil}
r([1,nil,[]]){next 1}
r([nil,nil,[]]){next []}
r([1,nil,[]]){next [1]}
r([nil,nil,[]]){next [nil]}
r([[],nil,[]]){next [[]]}
r([1,2,[]]){next [1,2]}
r([nil,nil,[]]){next [*[]]}
r([1,nil,[]]){next [*[1]]}
r([1,2,[]]){next [*[1,2]]}
def r(val); a,b,*c = *yield(); assert_equal(val, [a,b,c]); end
r([nil,nil,[]]){next *nil}
r([1,nil,[]]){next *1}
r([nil,nil,[]]){next *[]}
r([1,nil,[]]){next *[1]}
r([nil,nil,[]]){next *[nil]}
r([nil,nil,[]]){next *[[]]}
r([1,2,[]]){next *[1,2]}
r([nil,nil,[]]){next *[*[]]}
r([1,nil,[]]){next *[*[1]]}
r([1,2,[]]){next *[*[1,2]]}
end
def test_assign2
a = nil
assert(defined?(a))
assert_nil(a)
# multiple asignment
a, b = 1, 2
assert(a == 1 && b == 2)
a, b = b, a
assert(a == 2 && b == 1)
a, = 1,2
assert_equal(1, a)
a, *b = 1, 2, 3
assert(a == 1 && b == [2, 3])
a, (b, c), d = 1, [2, 3], 4
assert(a == 1 && b == 2 && c == 3 && d == 4)
*a = 1, 2, 3
assert_equal([1, 2, 3], a)
*a = 4
assert_equal([4], a)
*a = nil
assert_equal([nil], a)
end
end