hiroyuki-sato commented on code in PR #49209:
URL: https://github.com/apache/arrow/pull/49209#discussion_r2787953816


##########
ruby/red-arrow-format/test/test-writer.rb:
##########
@@ -996,35 +919,23 @@ def test_write
 class TestFileWriter < Test::Unit::TestCase
   include WriterTests
 
-  def setup
-    Dir.mktmpdir do |tmp_dir|
-      path = File.join(tmp_dir, "data.arrow")
-      File.open(path, "wb") do |output|
-        writer = ArrowFormat::FileWriter.new(output)
-        write(writer)
-      end
-      data = File.open(path, "rb", &:read).freeze
-      table = Arrow::Table.load(Arrow::Buffer.new(data), format: :arrow)
-      @type = table.value.data_type
-      @values = table.value.values
-    end
+  def file_extension
+    "arrow"
+  end
+
+  def writer_class
+    ArrowFormat::FileWriter
   end
 end
 
 class TestStreamingWriter < Test::Unit::TestCase
   include WriterTests
 
-  def setup
-    Dir.mktmpdir do |tmp_dir|
-      path = File.join(tmp_dir, "data.arrows")
-      File.open(path, "wb") do |output|
-        writer = ArrowFormat::StreamingWriter.new(output)
-        write(writer)
-      end
-      data = File.open(path, "rb", &:read).freeze
-      table = Arrow::Table.load(Arrow::Buffer.new(data), format: :arrows)
-      @type = table.value.data_type
-      @values = table.value.values
-    end
+  def file_extension
+    "arrows"

Review Comment:
   Just for interest: Use **arrow** and **arrows** intentionally?
   
   ```ruby
   class TestFileWriter < Test::Unit::TestCase
   
     def file_extension
       "arrow"
     end
   
   end
   
   class TestStreamingWriter < Test::Unit::TestCase
     def file_extension
       "arrows"
     end
   end
   ```



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