Test on Windows.

Author: ioquatix

.github/workflows/test.yaml

@@ -19,6 +19,7 @@ jobs:
         os:
           - ubuntu
           - macos
+          - windows
 
         ruby:
           - "3.2"
@@ -47,4 +48,4 @@ jobs:
 
     - name: Run tests
       timeout-minutes: 10
-      run: bundle exec bake test
+      run: bundle exec sus --verbose

lib/io/stream/buffered.rb

@@ -106,7 +106,7 @@ def sysclose
 			end
 		end
 
-		if RUBY_VERSION >= "3.3"
+		if RUBY_VERSION >= "3.3" and RUBY_PLATFORM !~ /win32|mswin|mingw/
 			def syswrite(buffer)
 				return @io.write(buffer)
 			end