Upstream Chrome on iOS source code [2/11].

ios/chrome/browser/payments/payment_items_display_coordinator_unittest.mm

+// Copyright 2016 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.
+
+#import "ios/chrome/browser/payments/payment_items_display_coordinator.h"
+
+#include "base/test/ios/wait_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// Tests that invoking start and stop on the coordinator presents and dismisses
+// the payment items display view controller, respectively.
+TEST(PaymentItemsDisplayCoordinatorTest, StartAndStop) {
+  @autoreleasepool {
+    UIViewController* base_view_controller =
+        [[[UIViewController alloc] init] autorelease];
+    UINavigationController* navigation_controller =
+        [[[UINavigationController alloc]
+            initWithRootViewController:base_view_controller] autorelease];
+    PaymentItemsDisplayCoordinator* coordinator =
+        [[[PaymentItemsDisplayCoordinator alloc]
+            initWithBaseViewController:base_view_controller] autorelease];
+
+    EXPECT_EQ(1u, [navigation_controller.viewControllers count]);
+
+    [coordinator start];
+    // Short delay to allow animation to complete.
+    base::test::ios::SpinRunLoopWithMaxDelay(
+        base::TimeDelta::FromSecondsD(1.0));
+    EXPECT_EQ(2u, [navigation_controller.viewControllers count]);
+
+    [coordinator stop];
+    // Short delay to allow animation to complete.
+    base::test::ios::SpinRunLoopWithMaxDelay(
+        base::TimeDelta::FromSecondsD(1.0));
+    EXPECT_EQ(1u, [navigation_controller.viewControllers count]);
+  }
+}
+
+}  // namespace