[Autofill] Deduplicate Autocomplete and Datalist suggestions, keeping the latter

components/autofill/core/browser/autofill_external_delegate_unittest.cc

 // Copyright 2013 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/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string16.h"
@@ skipping 274 matching lines @@
 
   // The enums must be cast to ints to prevent compile errors on linux_rel.
   EXPECT_CALL(
       autofill_client_,
       UpdateAutofillPopupDataListValues(data_list_items, data_list_items));
 
   external_delegate_->SetCurrentDataListValues(data_list_items,
                                                data_list_items);
 }
 
+// Test that we _don't_ de-dupe autofill values against datalist values. We
+// keep both with a separator.
+TEST_F(AutofillExternalDelegateUnitTest, DuplicateAutofillDatalistValues) {
+  IssueOnQuery(kQueryId);
+
+  std::vector<base::string16> data_list_items;
+  data_list_items.push_back(base::ASCIIToUTF16("Rick"));
+  data_list_items.push_back(base::ASCIIToUTF16("Deckard"));
+
+  EXPECT_CALL(
+      autofill_client_,
+      UpdateAutofillPopupDataListValues(data_list_items, data_list_items));
+
+  external_delegate_->SetCurrentDataListValues(data_list_items,
+                                               data_list_items);
+
+  // The enums must be cast to ints to prevent compile errors on linux_rel.
+  auto element_ids = testing::ElementsAre(
+      static_cast<int>(POPUP_ITEM_ID_DATALIST_ENTRY),
+      static_cast<int>(POPUP_ITEM_ID_DATALIST_ENTRY),
+#if !defined(OS_ANDROID)
+      static_cast<int>(POPUP_ITEM_ID_SEPARATOR),
+#endif
+      kAutofillProfileId,
+#if !defined(OS_ANDROID)
+      static_cast<int>(POPUP_ITEM_ID_SEPARATOR),
+#endif
+      static_cast<int>(POPUP_ITEM_ID_AUTOFILL_OPTIONS));
+  EXPECT_CALL(
+      autofill_client_,
+      ShowAutofillPopup(_, _, SuggestionVectorIdsAre(element_ids), _));
+
+  // Have an Autofill item that is identical to one of the datalist entries.
+  std::vector<Suggestion> autofill_item;
+  autofill_item.push_back(Suggestion());
+  autofill_item[0].value = ASCIIToUTF16("Rick");
+  autofill_item[0].frontend_id = kAutofillProfileId;;
+  external_delegate_->OnSuggestionsReturned(kQueryId, autofill_item);
+}
+
+// Test that we de-dupe autocomplete values against datalist values, keeping the
+// latter in case of a match.
+TEST_F(AutofillExternalDelegateUnitTest, DuplicateAutocompleteDatalistValues) {
+  IssueOnQuery(kQueryId);
+
+  std::vector<base::string16> data_list_items;
+  data_list_items.push_back(base::ASCIIToUTF16("Rick"));
+  data_list_items.push_back(base::ASCIIToUTF16("Deckard"));
+
+  EXPECT_CALL(
+      autofill_client_,
+      UpdateAutofillPopupDataListValues(data_list_items, data_list_items));
+
+  external_delegate_->SetCurrentDataListValues(data_list_items,
+                                               data_list_items);
+
+  // The enums must be cast to ints to prevent compile errors on linux_rel.
+  auto element_ids = testing::ElementsAre(
+      // We are expecting only two data list entries.
+      static_cast<int>(POPUP_ITEM_ID_DATALIST_ENTRY),
+      static_cast<int>(POPUP_ITEM_ID_DATALIST_ENTRY),
+#if !defined(OS_ANDROID)
+      static_cast<int>(POPUP_ITEM_ID_SEPARATOR),
+#endif
+      static_cast<int>(POPUP_ITEM_ID_AUTOCOMPLETE_ENTRY)
+  );
+  EXPECT_CALL(
+      autofill_client_,
+      ShowAutofillPopup(_, _, SuggestionVectorIdsAre(element_ids), _));
+
+  // Have an Autocomplete item that is identical to one of the datalist entries
+  // and one that is distinct.
+  std::vector<Suggestion> autocomplete_items;
+  autocomplete_items.push_back(Suggestion());
+  autocomplete_items[0].value = ASCIIToUTF16("Rick");
+  autocomplete_items[0].frontend_id = POPUP_ITEM_ID_AUTOCOMPLETE_ENTRY;
+  autocomplete_items.push_back(Suggestion());
+  autocomplete_items[1].value = ASCIIToUTF16("Cain");
+  autocomplete_items[1].frontend_id = POPUP_ITEM_ID_AUTOCOMPLETE_ENTRY;
+  external_delegate_->OnSuggestionsReturned(kQueryId, autocomplete_items);
+}
+
 // Test that the Autofill popup is able to display warnings explaining why
 // Autofill is disabled for a website.
 // Regression test for http://crbug.com/247880
 TEST_F(AutofillExternalDelegateUnitTest, AutofillWarnings) {
   IssueOnQuery(kQueryId);
 
   // The enums must be cast to ints to prevent compile errors on linux_rel.
   EXPECT_CALL(
       autofill_client_,
       ShowAutofillPopup(
@@ skipping 211 matching lines @@
               RendererShouldFillFieldWithValue(dummy_string));
   base::HistogramTester histogram_tester;
   external_delegate_->DidAcceptSuggestion(dummy_string,
                                           POPUP_ITEM_ID_AUTOCOMPLETE_ENTRY,
                                           0);
   histogram_tester.ExpectUniqueSample(
       "Autofill.SuggestionAcceptedIndex.Autocomplete", 0, 1);
 }
 
 }  // namespace autofill