Fix incorrect usage of `rb_fiber_scheduler_io_(p)(read|write)`. (#7593)

1 files changed, 33 insertions, 0 deletions

diff --git a/test/fiber/test_io_buffer.rb b/test/fiber/test_io_buffer.rb
index 48a34c31b6..3de70200d5 100644
--- a/test/fiber/test_io_buffer.rb
+++ b/test/fiber/test_io_buffer.rb
@@ -122,4 +122,37 @@ class TestFiberIOBuffer < Test::Unit::TestCase
     i&.close
     o&.close
   end
+
+  def test_io_buffer_read_write
+    omit "UNIXSocket is not defined!" unless defined?(UNIXSocket)
+
+    i, o = UNIXSocket.pair
+    source_buffer = IO::Buffer.for("Hello World!")
+    destination_buffer = IO::Buffer.new(source_buffer.size)
+
+    # Test non-scheduler code path:
+    source_buffer.write(o, source_buffer.size)
+    destination_buffer.read(i, source_buffer.size)
+    assert_equal source_buffer, destination_buffer
+
+    # Test scheduler code path:
+    destination_buffer.clear
+
+    thread = Thread.new do
+      scheduler = IOBufferScheduler.new
+      Fiber.set_scheduler scheduler
+
+      Fiber.schedule do
+        source_buffer.write(o, source_buffer.size)
+        destination_buffer.read(i, source_buffer.size)
+      end
+    end
+
+    thread.join
+
+    assert_equal source_buffer, destination_buffer
+  ensure
+    i&.close
+    o&.close
+  end
 end