1 files changed, 102 insertions, 0 deletions
diff --git a/src/arrow/ruby/red-arrow/test/test-decimal128.rb b/src/arrow/ruby/red-arrow/test/test-decimal128.rb
new file mode 100644
index 000000000..9e7f8792c
--- /dev/null
+++ b/src/arrow/ruby/red-arrow/test/test-decimal128.rb
@@ -0,0 +1,102 @@
+# 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 Decimal128Test < Test::Unit::TestCase
+  sub_test_case("instance methods") do
+    def setup
+      @decimal128 = Arrow::Decimal128.new("10.1")
+    end
+
+    sub_test_case("#==") do
+      test("Arrow::Decimal128") do
+        assert do
+          @decimal128 == @decimal128
+        end
+      end
+
+      test("not Arrow::Decimal128") do
+        assert do
+          not (@decimal128 == 10.1)
+        end
+      end
+    end
+
+    sub_test_case("#!=") do
+      test("Arrow::Decimal128") do
+        assert do
+          not (@decimal128 != @decimal128)
+        end
+      end
+
+      test("not Arrow::Decimal128") do
+        assert do
+          @decimal128 != 10.1
+        end
+      end
+    end
+
+    sub_test_case("#to_s") do
+      test("default") do
+        assert_equal("101",
+                     @decimal128.to_s)
+      end
+
+      test("scale") do
+        assert_equal("10.1",
+                     @decimal128.to_s(1))
+      end
+    end
+
+    test("#abs") do
+      decimal128 = Arrow::Decimal128.new("-10.1")
+      assert_equal([
+                     Arrow::Decimal128.new("-10.1"),
+                     Arrow::Decimal128.new("10.1"),
+                   ],
+                   [
+                     decimal128,
+                     decimal128.abs,
+                   ])
+    end
+
+    test("#abs!") do
+      decimal128 = Arrow::Decimal128.new("-10.1")
+      decimal128.abs!
+      assert_equal(Arrow::Decimal128.new("10.1"),
+                   decimal128)
+    end
+
+    test("#negate") do
+      decimal128 = Arrow::Decimal128.new("-10.1")
+      assert_equal([
+                     Arrow::Decimal128.new("-10.1"),
+                     Arrow::Decimal128.new("10.1"),
+                   ],
+                   [
+                     decimal128,
+                     decimal128.negate,
+                   ])
+    end
+
+    test("#negate!") do
+      decimal128 = Arrow::Decimal128.new("-10.1")
+      decimal128.negate!
+      assert_equal(Arrow::Decimal128.new("10.1"),
+                   decimal128)
+    end
+  end
+end