Add test for ReadingListMediator

ios/chrome/browser/ui/reading_list/reading_list_mediator_unittest.mm

Index: ios/chrome/browser/ui/reading_list/reading_list_mediator_unittest.mm
diff --git a/ios/chrome/browser/ui/reading_list/reading_list_mediator_unittest.mm b/ios/chrome/browser/ui/reading_list/reading_list_mediator_unittest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..2394879fe0424dcffa27fde2aef9bd13637f6b35
--- /dev/null
+++ b/ios/chrome/browser/ui/reading_list/reading_list_mediator_unittest.mm
@@ -0,0 +1,74 @@
+// 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/reading_list/reading_list_mediator.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/sys_string_conversions.h"
+#include "base/test/simple_test_clock.h"
+#include "components/reading_list/core/reading_list_model_impl.h"
+#include "components/url_formatter/url_formatter.h"
+#import "ios/chrome/browser/ui/reading_list/reading_list_collection_view_item.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+class ReadingListMediatorTest : public PlatformTest {
+ public:
+  ReadingListMediatorTest() {
+    std::unique_ptr<base::SimpleTestClock> clock =
+        base::MakeUnique<base::SimpleTestClock>();
+    clock_ = clock.get();
+    model_ = base::MakeUnique<ReadingListModelImpl>(nullptr, nullptr,
+                                                    std::move(clock));
+
+    no_title_entry_url_ = GURL("http://chromium.org/unread3");
+    // The first 3 have the same update time on purpose.
+    model_->AddEntry(GURL("http://chromium.org/unread1"), "unread1",
+                     reading_list::ADDED_VIA_CURRENT_APP);
+    model_->AddEntry(GURL("http://chromium.org/read1"), "read1",
+                     reading_list::ADDED_VIA_CURRENT_APP);
+    model_->SetReadStatus(GURL("http://chromium.org/read1"), true);
+    model_->AddEntry(GURL("http://chromium.org/unread2"), "unread2",
+                     reading_list::ADDED_VIA_CURRENT_APP);
+    clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+    model_->AddEntry(no_title_entry_url_, "",
+                     reading_list::ADDED_VIA_CURRENT_APP);
+    clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+    model_->AddEntry(GURL("http://chromium.org/read2"), "read2",
+                     reading_list::ADDED_VIA_CURRENT_APP);
+    model_->SetReadStatus(GURL("http://chromium.org/read2"), true);
+
+    mediator_ = [[ReadingListMediator alloc] initWithModel:model_.get()];
+  }
+
+ protected:
+  std::unique_ptr<ReadingListModelImpl> model_;
+  ReadingListMediator* mediator_;
+  base::SimpleTestClock* clock_;
+  GURL no_title_entry_url_;
+};
+
+TEST_F(ReadingListMediatorTest, fillItems) {
+  // Setup.
+  NSMutableArray<ReadingListCollectionViewItem*>* readArray =
+      [NSMutableArray array];
+  NSMutableArray<ReadingListCollectionViewItem*>* unreadArray =
+      [NSMutableArray array];
+
+  // Action.
+  [mediator_ fillReadItems:readArray unreadItems:unreadArray];
+
+  // Tests.
+  EXPECT_EQ(3U, [unreadArray count]);
+  EXPECT_EQ(2U, [readArray count]);
+  EXPECT_TRUE([unreadArray[0].title
+      isEqualToString:base::SysUTF16ToNSString(url_formatter::FormatUrl(
+                          no_title_entry_url_.GetOrigin()))]);
+  EXPECT_TRUE([readArray[0].title isEqualToString:@"read2"]);
+  EXPECT_TRUE([readArray[1].title isEqualToString:@"read1"]);
+}