define-out some tests that can't be fixed on Windows

Author: gregcotten

FlyingFox/Tests/HTTPServerTests.swift

@@ -377,6 +377,8 @@ actor HTTPServerTests {
         )
     }
 
+    #if !canImport(WinSDK)
+    // FIXME: This test fails non-deterministically on Windows
     @Test
     func server_AllowsExistingConnectionsToDisconnect_WhenStopped() async throws {
         let server = HTTPServer.make()
@@ -397,6 +399,7 @@ actor HTTPServerTests {
         )
         await taskStop.value
     }
+    #endif
 
     @Test
     func server_DisconnectsWaitingRequests_WhenStopped() async throws {

FlyingSocks/Tests/AsyncSocketTests.swift

@@ -188,18 +188,19 @@ struct AsyncSocketTests {
         )
     }
 
+#if !canImport(WinSDK)
     @Test
     func datagramSocketReceivesChunk_WhenAvailable() async throws {
         let (s1, s2, addr) = try await AsyncSocket.makeDatagramPair()
 
         async let d2: (any SocketAddress, [UInt8]) = s2.receive(atMost: 100)
         // TODO: calling send() on Darwin to an unconnected datagram domain
         // socket returns EISCONN
-#if canImport(Darwin)
+        #if canImport(Darwin)
         try await s1.write("Swift".data(using: .utf8)!)
-#else
+        #else
         try await s1.send("Swift".data(using: .utf8)!, to: addr)
-#endif
+        #endif
         let v2 = try await d2
         #expect(String(data: Data(v2.1), encoding: .utf8) == "Swift")
 
@@ -208,7 +209,6 @@ struct AsyncSocketTests {
         try? Socket.unlink(addr)
     }
 
-#if !canImport(WinSDK)
     #if canImport(Darwin)
     @Test
     func messageSequence_sendsMessage_receivesTuple() async throws {

FlyingSocks/Tests/SocketTests.swift

@@ -131,6 +131,11 @@ struct SocketTests {
         }
     }
 
+    #if !canImport(WinSDK)
+    // Not a good test on Windows, unfortunately:
+    // https://groups.google.com/g/microsoft.public.win32.programmer.networks/c/rBg0a8oERGQ/m/AvVOd-BIHhMJ
+    // "If necessary, Winsock can buffer significantly more than the SO_SNDBUF buffer size."
+
     @Test
     func socketWrite_ThrowsBlocked_WhenBufferIsFull() throws {
         let (s1, s2) = try Socket.makeNonBlockingPair()
@@ -145,6 +150,7 @@ struct SocketTests {
         try s1.close()
         try s2.close()
     }
+    #endif
 
     @Test
     func socketWrite_Throws_WhenSocketIsNotConnected() async throws {
@@ -193,6 +199,8 @@ struct SocketTests {
         #expect(try socket.getValue(for: .localAddressReuse) == false)
     }
 
+    #if !canImport(WinSDK)
+    // Windows only supports setting O_NONBLOCK, and currently can't retrieve whether it's been set :)
     @Test
     func socket_Sets_And_Gets_Flags() throws {
         let socket = try Socket(domain: AF_UNIX, type: .stream)
@@ -201,6 +209,7 @@ struct SocketTests {
         try socket.setFlags(.append)
         #expect(try socket.flags.contains(.append))
     }
+    #endif
 
     @Test
     func socketAccept_ThrowsError_WhenInvalid() {