[Payment Request] Displays appropriate footer if first transaction completed

components/payments/core/payments_test_util.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_PAYMENTS_CORE_PAYMENTS_TEST_UTIL_H_
+#define COMPONENTS_PAYMENTS_CORE_PAYMENTS_TEST_UTIL_H_
+
+#include <memory>
+
+class PrefService;
+
+namespace payments {
+
+// Common utilities shared amongst Payments tests.
+namespace test {
+
+// Return a PrefService that can be used for Payments-related testing in
+// contexts where the PrefService would otherwise have to be constructed
+// manually (e.g., in unit tests within Autofill core code). The returned
+// PrefService has had Autofill preferences registered on its associated
+// registry.
+std::unique_ptr<PrefService> PrefServiceForTesting();
+
+}  // namespace test
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_CORE_PAYMENTS_TEST_UTIL_H_