Selected shipping option in payment summary view + shipping option selection view

ios/chrome/browser/payments/shipping_option_selection_view_controller_unittest.mm

+// 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.
+
+#include <vector>
+
+#include "base/mac/foundation_util.h"
+#import "ios/chrome/browser/payments/shipping_option_selection_view_controller.h"
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
+#import "ios/chrome/browser/ui/collection_view/collection_view_controller_test.h"
+#include "ios/chrome/grit/ios_strings.h"
+#include "ios/web/public/payments/payment_request.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class ShippingOptionSelectionViewControllerTest
+    : public CollectionViewControllerTest {
+ protected:
+  CollectionViewController* NewController() override NS_RETURNS_RETAINED {
+    return [[ShippingOptionSelectionViewController alloc] init];
+  }
+
+  ShippingOptionSelectionViewController* ShippingOptionSelectionController() {
+    return base::mac::ObjCCastStrict<ShippingOptionSelectionViewController>(
+        controller());
+  }
+};
+
+// Tests that the correct number of items are displayed after loading the model
+// and that the correct item appears to be selected.
+TEST_F(ShippingOptionSelectionViewControllerTest, TestModel) {
+  CreateController();
+  CheckController();
+  CheckTitleWithId(IDS_IOS_PAYMENT_REQUEST_SHIPPING_OPTION_SELECTION_TITLE);
+
+  std::unique_ptr<web::PaymentShippingOption> option1(
+      new web::PaymentShippingOption());
+  std::unique_ptr<web::PaymentShippingOption> option2(
+      new web::PaymentShippingOption());
+
+  std::vector<web::PaymentShippingOption*> shippingOptions;
+  shippingOptions.push_back(option1.get());
+  shippingOptions.push_back(option2.get());
+
+  [ShippingOptionSelectionController() setShippingOptions:shippingOptions];
+  [ShippingOptionSelectionController()
+      setSelectedShippingOption:shippingOptions[0]];
+  [ShippingOptionSelectionController() loadModel];
+
+  ASSERT_EQ(1, NumberOfSections());
+  // One item for each of shipping options.
+  EXPECT_EQ(shippingOptions.size(),
+            static_cast<unsigned int>(NumberOfItemsInSection(0)));
+
+  // The first option should appear to be selected.
+  CollectionViewTextItem* item = GetCollectionViewItem(0, 0);
+  EXPECT_EQ(MDCCollectionViewCellAccessoryCheckmark, item.accessoryType);
+  item = GetCollectionViewItem(0, 1);
+  EXPECT_EQ(MDCCollectionViewCellAccessoryNone, item.accessoryType);
+}
+
+}  // namespace