Let's run tests on windows. (#116)

* `IO.pipe` is probably not non-blocking.

.github/workflows/test.yaml

@@ -20,6 +20,7 @@ jobs:
         os:
           - ubuntu
           - macos
+          - windows
 
         ruby:
           - "3.1"
@@ -42,9 +43,6 @@ jobs:
           - os: ubuntu
             ruby: head
             experimental: true
-          - os: windows
-            ruby: head
-            experimental: true
 
     steps:
     - uses: actions/checkout@v4

test/io/event/selector.rb

@@ -514,8 +514,10 @@ def transfer
 		let(:remote) {sockets.last}
 
 		it "can write a single message" do
+			skip_if_ruby_platform(/mswin|mingw|cygwin/)
+
 			return unless selector.respond_to?(:io_write)
-
+			
 			fiber = Fiber.new do
 				events << :io_write
 				buffer = IO::Buffer.for(message.dup)

test/io/event/selector/buffered_io.rb

@@ -17,6 +17,8 @@
 		let(:output) {pipe.last}
 
 		it "can read using a buffer" do
+			skip_if_ruby_platform(/mswin|mingw|cygwin/)
+
 			writer = Fiber.new do
 				buffer = IO::Buffer.new(128)
 				expect(selector.io_write(Fiber.current, output, buffer, 128)).to be == 128
@@ -34,11 +36,15 @@
 		end
 
 		it "can write zero length buffers" do
+			skip_if_ruby_platform(/mswin|mingw|cygwin/)
+
 			buffer = IO::Buffer.new(1).slice(0, 0)
 			expect(selector.io_write(Fiber.current, output, buffer, 0)).to be == 0
 		end
 
 		it "can read and write at the specified offset" do
+			skip_if_ruby_platform(/mswin|mingw|cygwin/)
+
 			writer = Fiber.new do
 				buffer = IO::Buffer.new(128)
 				# We can't write 128 bytes because there are only +64 bytes from offset 64.
@@ -58,10 +64,9 @@
 		end
 
 		it "can't write to the read end of a pipe" do
-			skip "Windows is bonkers" if RUBY_PLATFORM =~ /mswin|mingw|cygwin/
-			bsd = RUBY_PLATFORM =~ /bsd/
+			skip_if_ruby_platform(/mswin|mingw|cygwin/)
 
-			output.close if bsd # BSD traditionally has bidirectional pipes
+			output.close
 
 			writer = Fiber.new do
 				buffer = IO::Buffer.new(64)

test/io/event/selector/file_io.rb

@@ -12,6 +12,8 @@
 		let(:file) {Tempfile.new}
 
 		it "can read using a buffer" do
+			skip_if_ruby_platform(/mswin|mingw|cygwin/)
+
 			writer = Fiber.new do
 				buffer = IO::Buffer.new(128)
 				file.seek(0)