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require 'test/unit'
class TestHash < Test::Unit::TestCase
def test_clone_copies_default_initializer
hash = Hash.new { |h, k| h[k] = 0 }
clone = hash.clone
assert_equal 0, clone[:test]
end
class Eql
def initialize(hash); @hash=hash; end
def eql?(other); true; end
def hash; @hash; end
end
class Ee
def initialize(hash); @hash=hash; end
def ==(other); true; end
def hash; @hash; end
end
class Equal
def initialize(hash); @hash=hash; end
def equal?(other); true; end
def hash; @hash; end
end
def test_lookup_with_eql_and_same_hash_should_work
eql1 = Eql.new(5)
eql2 = Eql.new(5)
hash = {eql1 => "bar"}
assert_equal("bar", hash[eql1])
assert_equal("bar", hash[eql2])
end
def test_lookup_with_eql_and_different_hash_should_not_work
eql1 = Eql.new(5)
eql2 = Eql.new(6)
hash = {eql1 => "bar"}
assert_equal("bar", hash[eql1])
assert_nil(hash[eql2])
end
def test_lookup_with_ee_and_same_hash_should_not_work
ee1 = Ee.new(5)
ee2 = Ee.new(5)
hash = {ee1 => 'bar'}
assert_nil(hash[ee2])
end
def test_lookup_with_equal_and_same_hash_should_not_work
equal1 = Equal.new(5)
equal2 = Equal.new(5)
hash = {equal1 => 'bar'}
assert_nil(hash[equal2])
end
end
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