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require 'test/unit'
class TestAssignment < Test::Unit::TestCase
def testBasicAssignment
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 = [*[]]; 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 = nil; assert_equal([nil], a)
a = *[]; assert_nil(a)
a = *[1]; assert_equal(1, a)
a = *[nil]; assert_nil(a)
a = *[[]]; assert_equal([], a)
a = *[*[]]; assert_nil(a)
a = *[*[1]]; assert_equal(1, a)
a = *[*[1,2]]; assert_equal([1,2], 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 = [*[]]; assert_equal([[]], a)
*a = [*[1]]; assert_equal([[1]], a)
*a = [*[1,2]]; assert_equal([[1,2]], a)
*a = *nil; assert_equal([nil], a)
*a = *[nil]; assert_equal([nil], a)
*a = *[[]]; assert_equal([[]], a)
*a = *1; assert_equal([1], a)
*a = *[]; assert_equal([], a)
*a = *[1]; assert_equal([1], 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 = [*[]]; 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 = *[*[]]; 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 testExpansionWithNoConversion
*x = (1..7).to_a
assert_equal([[1, 2, 3, 4, 5, 6, 7]], x)
end
def testMultipleAssignment
a, b = 1, 2
assert_equal(1, a)
assert_equal(2, b)
a, b = b, a
assert_equal(2, a)
assert_equal(1, b)
a, = 1,2
assert_equal(1, a)
a, *b = 1, 2, 3
assert_equal(1, a)
assert_equal([2, 3], b)
a, (b, c), d = 1, [2, 3], 4
assert_equal(1, a)
assert_equal(2, b)
assert_equal(3, c)
assert_equal(4, d)
*a = 1, 2, 3
assert_equal([1, 2, 3], a)
*a = 4
assert_equal([4], a)
*a = nil
assert_equal([nil], a)
end
def testConditionalAssignment
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)
end
class X; def to_ary; [1, 2, 3, 4]; end; end
def test_absurd_multiple_assignment
a, (b, c, *d), (e, f), *g = 0, X.new, [5, 6], 7, 8
assert_equal([0, 1, 2, [3, 4], 5, 6, [7, 8]], [a,b,c,d,e,f,g])
end
class Bar
class << self
@@foo = {}
def bar
a, @@foo = 1, {:a=>:b}
@@foo
end
end
end
def test_multiple_assignment_class_vars
assert_equal({:a=>:b}, Bar.bar)
end
end
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