require 'test/unit'
$LOAD_PATH << 'lib'
require 'dm/utils'

include DataMapper::Utils::ClassMethods

class DmUtilsTestCase < Test::Unit::TestCase
  def test_merge_conditions
    assert_equal ["(foo = ?) AND (bar = ? OR bar = ?)", 1, 2, 3],
                 merge_conditions(["foo = ?", 1],
                                  ["bar = ? OR bar = ?", 2, 3])

    assert_equal ["(foo = ?) AND (bar IN (?))", 1, [2, 3]],
                 merge_conditions(["foo = ?", 1],
                                  ["bar IN (?)", [2, 3]])

    assert_equal ["(foo = ?)", 1],
                 merge_conditions(["foo = ?", 1], nil)

    assert_equal ["(foo = ?)", 1],
                 merge_conditions(nil, ["foo = ?", 1])

    assert_equal [""],
                 merge_conditions(nil, nil)

    assert_equal ["(foo IS NULL)"],
                 merge_conditions(["foo IS NULL"], nil)

    assert_equal ["(foo IS NOT NULL)"],
                 merge_conditions(nil, ["foo IS NOT NULL"])
  end
end