Update caddy/caddy_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Marc <m@pyc.ac>

Author: henderkes

caddy/caddy_test.go

@@ -488,7 +488,7 @@ func TestPHPServerDirectiveDisableFileServer(t *testing.T) {
 
 func TestPHPServerGlobals(t *testing.T) {
 	documentRoot, _ := filepath.Abs("../testdata")
-	scriptFilename := documentRoot + string(filepath.Separator) + "server-globals.php"
+	scriptFilename := filepath.Join(documentRoot, "server-globals.php")
 
 	tester := caddytest.NewTester(t)
 	initServer(t, tester, `