Try harder not to hang in referrer.t

Code changes courtesy of GitHub Copilot

Author: oalders

t/local/referer.t

@@ -25,9 +25,19 @@ SKIP: {
         $command = qq'mcr $^X t/referer-server';
     }
 
+    # Set a timeout to ensure we don't hang forever
+    local $SIG{ALRM} = sub { die "Timeout waiting for test server to start\n" };
+    alarm 10; # 10 second timeout
+
     open $server, "$command |" or die "Couldn't spawn fake server: $!";
-    sleep 1;    # give the child some time
+
+    # Wait for server startup with proper error handling
     my $url = <$server>;
+    alarm 0; # Cancel the alarm
+
+    if (!defined $url || $url eq '') {
+        die "Failed to get a response from test server\n";
+    }
     chomp $url;
 
     $agent->get($url);
@@ -65,12 +75,22 @@ SKIP: {
     is( $agent->status, 200, 'Got fourth page' ) or diag $agent->res->message;
     is( $agent->content, "Referer: '$ref'", 'Custom referer can be set' );
 
+    # Add a timeout for the server shutdown
+    local $SIG{ALRM} = sub { die "Timeout waiting for server to quit\n" };
+    alarm 5; # 5 second timeout
+
     $agent->get( $url . 'quit_server' );
     ok( $agent->success, 'Quit OK' );
 }
 
 memory_cycle_ok( $agent, 'No memory cycles found' );
 
 END {
-    close $server if $server;
+    if ($server) {
+        # Make sure we don't hang in END block
+        local $SIG{ALRM} = sub { warn "Timeout closing server handle\n"; exit 1 };
+        alarm 3;
+        close $server;
+        alarm 0;
+    }
 }