partSizes []int64, metadata map[string]string, asMultipart bool,
) {
	if len(partSizes) == 0 {
		t.Fatalf("Cannot upload an object without part sizes")
	}
	if len(partSizes) > 1 {
		asMultipart = true
	}

	checkRespErr := func(rec *httptest.ResponseRecorder, exp int) {
		t.Helper()
		if rec.Code != exp {