ruby/red-arrow/test/test-csv-writer.rb

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class CSVWriterTest < Test::Unit::TestCase
  sub_test_case("CSVWriteOptions") do
    def setup
      @options = Arrow::CSVWriteOptions.new
    end

    def test_delimiter
      assert_equal(",", @options.delimiter)
      @options.delimiter = ";"
      assert_equal(";", @options.delimiter)
    end
  end

  def test_write_table
    table = Arrow::Table.new({
      message: ["Start", nil, "Reboot"],
      count: [2, 9, 5],
    })

    buffer = Arrow::ResizableBuffer.new(0)
    Arrow::BufferOutputStream.open(buffer) do |output|
      Arrow::CSVWriter.open(output, table.schema, delimiter: ";") do |csv_writer|
        csv_writer.write_table(table)
      end
    end

    csv_output = buffer.data.to_s
    expected = <<~CSV
      "message";"count"
      "Start";2
      ;9
      "Reboot";5
    CSV
    assert_equal(expected, csv_output)
  end
end