Add logic for fetching the Reading List entries

components/ntp_snippets/reading_list/reading_list_suggestions_provider_unittest.cc

Index: components/ntp_snippets/reading_list/reading_list_suggestions_provider_unittest.cc
diff --git a/components/ntp_snippets/reading_list/reading_list_suggestions_provider_unittest.cc b/components/ntp_snippets/reading_list/reading_list_suggestions_provider_unittest.cc
index 907a5c377eb5974c9df98433fa77e388533e7310..22f9399497e0026f5b74fd8d445914711f3a533b 100644
--- a/components/ntp_snippets/reading_list/reading_list_suggestions_provider_unittest.cc
+++ b/components/ntp_snippets/reading_list/reading_list_suggestions_provider_unittest.cc
@@ -15,17 +15,27 @@ namespace ntp_snippets {
 
 namespace {
 
+using ::testing::Property;
+
 class ReadingListSuggestionsProviderTest : public ::testing::Test {
  public:
   ReadingListSuggestionsProviderTest() {
+    std::unique_ptr<base::SimpleTestClock> clock =
+        base::MakeUnique<base::SimpleTestClock>();
+    clock_ = clock.get();
     model_ = base::MakeUnique<ReadingListModelImpl>(
-        /*storage_layer=*/nullptr, /*pref_service=*/nullptr,
-        base::MakeUnique<base::SimpleTestClock>());
+        /*storage_layer=*/nullptr, /*pref_service=*/nullptr, std::move(clock));
+  }
+
+  void CreateProvider() {
     EXPECT_CALL(observer_,
                 OnCategoryStatusChanged(testing::_, ReadingListCategory(),
                                         CategoryStatus::AVAILABLE_LOADING))
         .RetiresOnSaturation();
-
+    EXPECT_CALL(observer_,
+                OnCategoryStatusChanged(testing::_, ReadingListCategory(),
+                                        CategoryStatus::AVAILABLE))
+        .RetiresOnSaturation();
     provider_ = base::MakeUnique<ReadingListSuggestionsProvider>(&observer_,
                                                                  model_.get());
   }
@@ -35,16 +45,61 @@ class ReadingListSuggestionsProviderTest : public ::testing::Test {
   }
 
  protected:
+  base::SimpleTestClock* clock_;
   std::unique_ptr<ReadingListModelImpl> model_;
   testing::StrictMock<MockContentSuggestionsProviderObserver> observer_;
   std::unique_ptr<ReadingListSuggestionsProvider> provider_;
 };
 
 TEST_F(ReadingListSuggestionsProviderTest, CategoryInfo) {
+  EXPECT_CALL(observer_, OnNewSuggestions(testing::_, ReadingListCategory(),
+                                          testing::IsEmpty()))
+      .RetiresOnSaturation();
+  CreateProvider();
+
   CategoryInfo categoryInfo = provider_->GetCategoryInfo(ReadingListCategory());
   EXPECT_EQ(ContentSuggestionsAdditionalAction::VIEW_ALL,
             categoryInfo.additional_action());
 }
 
+TEST_F(ReadingListSuggestionsProviderTest, testReturnedSuggestions) {
+  GURL urlUnread1 = GURL("http://www.foo1.bar");
+  GURL urlUnread2 = GURL("http://www.foo2.bar");
+  GURL urlUnread3 = GURL("http://www.foo3.bar");
+  GURL urlUnread4 = GURL("http://www.foo4.bar");
+  GURL urlRead1 = GURL("http://www.bar.foor");
+  std::string unreadTitle1 = "title1";
+  std::string unreadTitle2 = "title2";
+  std::string unreadTitle3 = "title3";
+  std::string unreadTitle4 = "title3";
+  std::string readTitle1 = "readTitle4";
+  model_->AddEntry(urlUnread1, unreadTitle1,
+                   reading_list::ADDED_VIA_CURRENT_APP);
+  clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+  model_->AddEntry(urlUnread2, unreadTitle2,
+                   reading_list::ADDED_VIA_CURRENT_APP);
+  clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+  model_->AddEntry(urlRead1, readTitle1, reading_list::ADDED_VIA_CURRENT_APP);
+  model_->SetReadStatus(urlRead1, true);
+  clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+  model_->AddEntry(urlUnread3, unreadTitle3,
+                   reading_list::ADDED_VIA_CURRENT_APP);
+  clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+  model_->AddEntry(urlUnread4, unreadTitle4,
+                   reading_list::ADDED_VIA_CURRENT_APP);
+  clock_->Advance(base::TimeDelta::FromMilliseconds(10));
+
+  EXPECT_CALL(
+      observer_,
+      OnNewSuggestions(
+          testing::_, ReadingListCategory(),
+          testing::ElementsAre(Property(&ContentSuggestion::url, urlUnread4),
+                               Property(&ContentSuggestion::url, urlUnread3),
+                               Property(&ContentSuggestion::url, urlUnread2))));
+
+  CreateProvider();
+}
+
 }  // namespace
+
 }  // namespace ntp_snippets