1 files changed, 74 insertions, 0 deletions
diff --git a/src/arrow/c_glib/test/test-mutable-buffer.rb b/src/arrow/c_glib/test/test-mutable-buffer.rb
new file mode 100644
index 000000000..ccfd6e222
--- /dev/null
+++ b/src/arrow/c_glib/test/test-mutable-buffer.rb
@@ -0,0 +1,74 @@
+# 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 TestMutableBuffer < Test::Unit::TestCase
+  def setup
+    @data = "Hello"
+    @buffer = Arrow::MutableBuffer.new(@data)
+  end
+
+  def test_new_bytes
+    bytes_data = GLib::Bytes.new(@data)
+    buffer = Arrow::MutableBuffer.new(bytes_data)
+    if GLib.check_binding_version?(3, 2, 2)
+      assert_equal(bytes_data.pointer, buffer.mutable_data.pointer)
+    else
+      assert_equal(@data, buffer.mutable_data.to_s)
+    end
+  end
+
+  def test_mutable?
+    assert do
+      @buffer.mutable?
+    end
+  end
+
+  def test_mutable_data
+    assert_equal(@data, @buffer.mutable_data.to_s)
+  end
+
+  def test_slice
+    sliced_buffer = @buffer.slice(1, 3)
+    assert_equal(@data[1, 3], sliced_buffer.data.to_s)
+  end
+
+  sub_test_case("#set_data") do
+    test("offset") do
+      @buffer.set_data(1, "EL")
+      assert_equal("HELlo", @buffer.data.to_s)
+    end
+
+    test("replace") do
+      @buffer.set_data(0, "World")
+      assert_equal("World", @buffer.data.to_s)
+    end
+
+    test("offset: too large") do
+      message = "[mutable-buffer][set-data]: Data is too large: <(5 + 1) > (5)>"
+      assert_raise(Arrow::Error::Invalid.new(message)) do
+        @buffer.set_data(5, "X")
+      end
+    end
+
+    test("data too large") do
+      message = "[mutable-buffer][set-data]: Data is too large: <(0 + 6) > (5)>"
+      assert_raise(Arrow::Error::Invalid.new(message)) do
+        @buffer.set_data(0, @data + "!")
+      end
+    end
+  end
+end