[Payment Request] Adds a secondary text label to PaymentsTextCell

ios/chrome/browser/payments/cells/payments_text_item_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.
 
 #import "ios/chrome/browser/payments/cells/payments_text_item.h"
 
 #import "ios/chrome/browser/ui/collection_view/cells/test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 // Tests that the text label and the image are set properly after a call to
 // |configureCell:|.
 TEST(PaymentRequestPaymentsTextItemTest, TextLabelAndImage) {
   PaymentsTextItem* item = [[PaymentsTextItem alloc] initWithType:0];
 
-  NSString* text = @"Lorem ipsum dolor sit amet";
+  NSString* text = @"Lorem ipsum";
+  NSString* detailText = @"Dolor sit amet";
   UIImage* image = ios_internal::CollectionViewTestImage();
 
   item.text = text;
+  item.detailText = detailText;
   item.image = image;
 
   id cell = [[[item cellClass] alloc] init];
   ASSERT_TRUE([cell isMemberOfClass:[PaymentsTextCell class]]);
 
   PaymentsTextCell* paymentsTextCell = cell;
   EXPECT_FALSE(paymentsTextCell.textLabel.text);
+  EXPECT_FALSE(paymentsTextCell.detailTextLabel.text);
   EXPECT_FALSE(paymentsTextCell.imageView.image);
 
   [item configureCell:paymentsTextCell];
   EXPECT_NSEQ(text, paymentsTextCell.textLabel.text);
+  EXPECT_NSEQ(detailText, paymentsTextCell.detailTextLabel.text);
   EXPECT_NSEQ(image, paymentsTextCell.imageView.image);
 }
 
 }  // namespace