c_glib/test/test-feather-file-writer.rb

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class TestFeatherFileWriter < Test::Unit::TestCase
  include Helper::Buildable

  def test_append
    tempfile = Tempfile.open("arrow-feather-file-writer")
    output = Arrow::FileOutputStream.new(tempfile.path, false)
    begin
      writer = Arrow::FeatherFileWriter.new(output)
      begin
        writer.description = "Log"
        writer.n_rows = 3
        writer.append("message",
                      build_string_array(["Crash", "Error", "Shutdown"]))
        writer.append("is_critical",
                      build_boolean_array([true, true, false]))
      ensure
        writer.close
      end
    ensure
      output.close
    end

    input = Arrow::MemoryMappedInputStream.new(tempfile.path)
    begin
      reader = Arrow::FeatherFileReader.new(input)
      assert_equal([true, "Log"],
                   [reader.has_description?, reader.description])
      column_values = {}
      reader.columns.each do |column|
        values = []
        column.data.chunks.each do |array|
          array.length.times do |j|
            if array.respond_to?(:get_string)
              values << array.get_string(j)
            else
              values << array.get_value(j)
            end
          end
        end
        column_values[column.name] = values
      end
      assert_equal({
                     "message" => ["Crash", "Error", "Shutdown"],
                     "is_critical" => [true, true, false],
                   },
                   column_values)
    ensure
      input.close
    end
  end
end