c_glib/test/test-cast.rb

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class TestCast < Test::Unit::TestCase
  include Helper::Buildable
  include Helper::Omittable

  def test_safe
    require_gi(1, 42, 0)
    data = [-1, 2, nil]
    assert_equal(build_int32_array(data),
                 build_int8_array(data).cast(Arrow::Int32DataType.new))
  end

  sub_test_case("allow-int-overflow") do
    def test_default
      require_gi(1, 42, 0)
      assert_raise(Arrow::Error::Invalid) do
        build_int32_array([128]).cast(Arrow::Int8DataType.new)
      end
    end

    def test_true
      options = Arrow::CastOptions.new
      options.allow_int_overflow = true
      assert_equal(build_int8_array([-128]),
                   build_int32_array([128]).cast(Arrow::Int8DataType.new,
                                                 options))
    end
  end

  sub_test_case("allow-time-truncate") do
    def test_default
      require_gi(1, 42, 0)
      after_epoch = 1504953190854 # 2017-09-09T10:33:10.854Z
      second_timestamp = Arrow::TimestampDataType.new(:second)
      assert_raise(Arrow::Error::Invalid) do
        build_timestamp_array(:milli, [after_epoch]).cast(second_timestamp)
      end
    end

    def test_true
      options = Arrow::CastOptions.new
      options.allow_time_truncate = true
      after_epoch_in_milli = 1504953190854 # 2017-09-09T10:33:10.854Z
      second_array = build_timestamp_array(:second,
                                           [after_epoch_in_milli / 1000])
      milli_array  = build_timestamp_array(:milli, [after_epoch_in_milli])
      second_timestamp = Arrow::TimestampDataType.new(:second)
      assert_equal(second_array,
                   milli_array.cast(second_timestamp, options))
    end
  end
end