1 files changed, 36 insertions, 0 deletions
diff --git a/src/arrow/ruby/red-arrow/test/test-map-data-type.rb b/src/arrow/ruby/red-arrow/test/test-map-data-type.rb
new file mode 100644
index 000000000..cdbbc2ed1
--- /dev/null
+++ b/src/arrow/ruby/red-arrow/test/test-map-data-type.rb
@@ -0,0 +1,36 @@
+# 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 MapDataTypeTest < Test::Unit::TestCase
+  sub_test_case(".new") do
+    def setup
+      @key = :int8
+      @item = :string
+    end
+
+    test("ordered arguments") do
+      assert_equal("map<int8, string>",
+                   Arrow::MapDataType.new(@key, @item).to_s)
+    end
+
+    test("description") do
+      assert_equal("map<int8, string>",
+                   Arrow::MapDataType.new(key: @key,
+                                          item: @item).to_s)
+    end
+  end
+end