Connect ContentSuggestionsMediator to the ContentService

ios/chrome/browser/ui/content_suggestions/content_suggestions_image_updater_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/ui/content_suggestions/content_suggestions_image_updater.h"
+
+#import <UIKit/UIKit.h>
+
+#include "testing/gtest/include/gtest/gtest.h"
+#import "third_party/ocmock/OCMock/OCMock.h"
+#include "third_party/ocmock/gtest_support.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+TEST(ContentSuggestionsImageUpdaterTest, receivedImage) {
+  // Setup.
+  UIImage* image = [[UIImage alloc] init];
+  id delegateMock =
+      OCMProtocolMock(@protocol(ContentSuggestionsImageUpdaterDelegate));
+  ContentSuggestionsImageUpdater* imageUpdater =
+      [[ContentSuggestionsImageUpdater alloc] init];
+  imageUpdater.delegate = delegateMock;
+
+  // Action.
+  [imageUpdater receivedImage:image];
+
+  // Test.
+  EXPECT_OCMOCK_VERIFY(delegateMock);
+}