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require 'test/unit'
class TestComparable < Test::Unit::TestCase
class Smallest
include Comparable
def <=> (other)
-1
end
end
class Equal
include Comparable
def <=> (other)
0
end
end
class Biggest
include Comparable
def <=> (other)
1
end
end
class Different
include Comparable
def <=> (other)
nil
end
end
def setup
@s = Smallest.new
@e = Equal.new
@b = Biggest.new
@d = Different.new
end
def test_spaceship
assert_equal(-1, @s <=> 3)
assert_equal(-1, @s <=> 1)
assert_equal(0, @e <=> 3)
assert_equal(0, @e <=> 1)
assert_equal(1, @b <=> 3)
assert_equal(1, @b <=> 1)
assert_equal(nil, @d <=> 3)
assert_equal(nil, @d <=> 1)
end
def test_smaller
assert_equal(true, @s < 3)
assert_equal(true, @s <= 3)
assert_equal(false, @s > 3)
assert_equal(false, @s >= 3)
assert_equal(false, @s == 3)
assert_equal(false, @s.between?(1, 3))
end
def test_equal
assert_equal(false, @e < 3)
assert_equal(true, @e <= 3)
assert_equal(false, @e > 3)
assert_equal(true, @e >= 3)
assert_equal(true, @e == 3)
assert_equal(true, @e.between?(1, 3))
end
def test_bigger
assert_equal(false, @b < 3)
assert_equal(false, @b <= 3)
assert_equal(true, @b > 3)
assert_equal(true, @b >= 3)
assert_equal(false, @b == 3)
assert_equal(false, @b.between?(1, 3))
end
def test_different
assert_raises(ArgumentError) { @d < 3 }
assert_raises(ArgumentError) { @d <= 3 }
assert_raises(ArgumentError) { @d > 3 }
assert_raises(ArgumentError) { @d >= 3 }
assert_equal(nil, @d == 3)
assert_raises(ArgumentError) { @d.between?(1, 3) }
end
end
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