1 files changed, 112 insertions, 0 deletions
diff --git a/src/arrow/ruby/red-arrow/test/test-decimal256-array-builder.rb b/src/arrow/ruby/red-arrow/test/test-decimal256-array-builder.rb
new file mode 100644
index 000000000..f0769b662
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+++ b/src/arrow/ruby/red-arrow/test/test-decimal256-array-builder.rb
@@ -0,0 +1,112 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+class Decimal256ArrayBuilderTest < Test::Unit::TestCase
+  def setup
+    @data_type = Arrow::Decimal256DataType.new(3, 1)
+    @builder = Arrow::Decimal256ArrayBuilder.new(@data_type)
+  end
+
+  sub_test_case("#append_value") do
+    test("nil") do
+      @builder.append_value(nil)
+      array = @builder.finish
+      assert_equal(nil, array[0])
+    end
+
+    test("Arrow::Decimal256") do
+      @builder.append_value(Arrow::Decimal256.new("10.1"))
+      array = @builder.finish
+      assert_equal(BigDecimal("10.1"),
+                   array[0])
+    end
+
+    test("String") do
+      @builder.append_value("10.1")
+      array = @builder.finish
+      assert_equal(BigDecimal("10.1"),
+                   array[0])
+    end
+
+    test("Float") do
+      @builder.append_value(10.1)
+      array = @builder.finish
+      assert_equal(BigDecimal("10.1"),
+                   array[0])
+    end
+
+    test("BigDecimal") do
+      @builder.append_value(BigDecimal("10.1"))
+      array = @builder.finish
+      assert_equal(BigDecimal("10.1"),
+                   array[0])
+    end
+  end
+
+  sub_test_case("#append_values") do
+    test("mixed") do
+      @builder.append_values([
+                               Arrow::Decimal256.new("10.1"),
+                               nil,
+                               "10.1",
+                               10.1,
+                               BigDecimal("10.1"),
+                             ])
+      array = @builder.finish
+      assert_equal([
+                     BigDecimal("10.1"),
+                     nil,
+                     BigDecimal("10.1"),
+                     BigDecimal("10.1"),
+                     BigDecimal("10.1"),
+                   ],
+                   array.to_a)
+    end
+
+    test("is_valids") do
+      @builder.append_values([
+                               Arrow::Decimal256.new("10.1"),
+                               Arrow::Decimal256.new("10.1"),
+                               Arrow::Decimal256.new("10.1"),
+                             ],
+                             [
+                               true,
+                               false,
+                               true,
+                             ])
+      array = @builder.finish
+      assert_equal([
+                     BigDecimal("10.1"),
+                     nil,
+                     BigDecimal("10.1"),
+                   ],
+                   array.to_a)
+    end
+
+    test("packed") do
+      @builder.append_values(Arrow::Decimal256.new("10.1").to_bytes.to_s * 3,
+                             [true, false, true])
+      array = @builder.finish
+      assert_equal([
+                     BigDecimal("10.1"),
+                     nil,
+                     BigDecimal("10.1"),
+                   ],
+                   array.to_a)
+    end
+  end
+end