chore: add unit tests (#1615)

* test: add more tests

* test: add more tests

rest/internal/starter.go

@@ -10,25 +10,25 @@ import (
 )
 
 // StartOption defines the method to customize http.Server.
-type StartOption func(srv *http.Server)
+type StartOption func(svr *http.Server)
 
 // StartHttp starts a http server.
 func StartHttp(host string, port int, handler http.Handler, opts ...StartOption) error {
-	return start(host, port, handler, func(srv *http.Server) error {
-		return srv.ListenAndServe()
+	return start(host, port, handler, func(svr *http.Server) error {
+		return svr.ListenAndServe()
 	}, opts...)
 }
 
 // StartHttps starts a https server.
 func StartHttps(host string, port int, certFile, keyFile string, handler http.Handler,
 	opts ...StartOption) error {
-	return start(host, port, handler, func(srv *http.Server) error {
+	return start(host, port, handler, func(svr *http.Server) error {
 		// certFile and keyFile are set in buildHttpsServer
-		return srv.ListenAndServeTLS(certFile, keyFile)
+		return svr.ListenAndServeTLS(certFile, keyFile)
 	}, opts...)
 }
 
-func start(host string, port int, handler http.Handler, run func(srv *http.Server) error,
+func start(host string, port int, handler http.Handler, run func(svr *http.Server) error,
 	opts ...StartOption) (err error) {
 	server := &http.Server{
 		Addr:    fmt.Sprintf("%s:%d", host, port),