func TestServerShutdownThenServe(t *testing.T) {
	var srv Server
	cl := &countCloseListener{Listener: nil}
	srv.Shutdown(context.Background())
	got := srv.Serve(cl)
	if got != ErrServerClosed {
		t.Errorf("Serve err = %v; want ErrServerClosed", got)
	}
	nclose := atomic.LoadInt32(&cl.closes)
	if nclose != 1 {
		t.Errorf("Close calls = %v; want 1", nclose)
	}
}

		{"ErrMissingFile", Var, 0},
		{"ErrNoCookie", Var, 0},
		{"ErrNoLocation", Var, 0},
		{"ErrNotMultipart", Var, 0},
		{"ErrNotSupported", Var, 0},
		{"ErrSchemeMismatch", Var, 21},
		{"ErrServerClosed", Var, 8},
		{"ErrShortBody", Var, 0},
		{"ErrSkipAltProtocol", Var, 6},
		{"ErrUnexpectedTrailer", Var, 0},
		{"ErrUseLastResponse", Var, 7},
		{"ErrWriteAfterFlush", Var, 0},
		{"Error", Func, 0},