Enable GHC 9.10, 9.12, 9.14 in CI, add a test case for DontFragment option

.github/workflows/haskell.yml

@@ -35,7 +35,7 @@ jobs:
       fail-fast: false
       matrix:
         os:  [ 'ubuntu-latest', 'macOS-latest', 'windows-latest' ]
-        ghc: [ '9.4', '9.6', '9.8' ]
+        ghc: [ '9.4', '9.6', '9.8', '9.10', '9.12', '9.14' ]
 
     steps:
     - uses: actions/checkout@v4

tests/Network/SocketSpec.hs

@@ -101,6 +101,13 @@
               getSocketOption sock UserTimeout `shouldReturn` 2000
               close sock
 
+    describe "DontFragment" $ do
+        it "can be set" $ do
+            sock <- socket AF_INET Stream defaultProtocol
+            when (isSupportedSocketOption DontFragment) $
+                setSocketOption sock DontFragment 1
+            close sock
+
     describe "getAddrInfo" $ do
         it "works for IPv4 address" $ do
             let hints = defaultHints { addrFlags = [AI_NUMERICHOST, AI_ADDRCONFIG] }
@@ -427,7 +434,7 @@
 cmsgidGen = biasedGen (\g -> CmsgId <$> g <*> g) cmsgidPatterns arbitrary
 
 genFds :: Gen [Fd]
 genFds = listOf (Fd <$> arbitrary)
 
 -- pruned lists of pattern synonym values for each type to generate values from