c_glib/test/test-record-batch-reader.rb

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

  def setup
    fields = [
      Arrow::Field.new("visible", Arrow::BooleanDataType.new),
      Arrow::Field.new("point", Arrow::Int32DataType.new),
    ]
    @schema = Arrow::Schema.new(fields)
    @record_batches = [
      [
        build_boolean_array([true, false, true]),
        build_int32_array([1, 2, 3]),
      ],
      [
        build_boolean_array([false, true, false, true]),
        build_int32_array([-1, -2, -3, -4]),
      ]
    ].collect do |columns|
      Arrow::RecordBatch.new(@schema, columns[0].length, columns)
    end
    @reader = Arrow::RecordBatchReader.new(@record_batches, @schema)
  end

  def test_export
    require_gi_bindings(3, 4, 8)
    c_abi_array_stream = @reader.export
    assert_equal(Arrow::Table.new(@schema, @record_batches),
                 Arrow::RecordBatchReader.import(c_abi_array_stream).read_all)
  end

  def test_schema
    assert_equal(@schema, @reader.schema)
  end

  def test_read_next
    assert_equal(@record_batches[0], @reader.read_next)
    assert_equal(@record_batches[1], @reader.read_next)
    assert_nil(@reader.read_next)
  end

  def test_read_all
    assert_equal(Arrow::Table.new(@schema, @record_batches),
                 @reader.read_all)
  end
end