1 files changed, 41 insertions, 0 deletions
diff --git a/src/arrow/ruby/red-arrow/test/test-sparse-union-data-type.rb b/src/arrow/ruby/red-arrow/test/test-sparse-union-data-type.rb
new file mode 100644
index 000000000..e672f82d4
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+++ b/src/arrow/ruby/red-arrow/test/test-sparse-union-data-type.rb
@@ -0,0 +1,41 @@
+# 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 SparseUnionDataTypeTest < Test::Unit::TestCase
+  sub_test_case(".new") do
+    def setup
+      @fields = [
+        Arrow::Field.new("visible", :boolean),
+        {
+          name: "count",
+          type: :int32,
+        },
+      ]
+    end
+
+    test("ordered arguments") do
+      assert_equal("sparse_union<visible: bool=2, count: int32=9>",
+                   Arrow::SparseUnionDataType.new(@fields, [2, 9]).to_s)
+    end
+
+    test("description") do
+      assert_equal("sparse_union<visible: bool=2, count: int32=9>",
+                   Arrow::SparseUnionDataType.new(fields: @fields,
+                                                  type_codes: [2, 9]).to_s)
+    end
+  end
+end