[AiS] Remove answer contents from all matches other than the first.

chrome/browser/autocomplete/search_provider_unittest.cc

 // Copyright 2012 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 "components/omnibox/search_provider.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 3402 matching lines @@
   AutocompleteInput input(base::ASCIIToUTF16("weather l"),
                           base::string16::npos, base::string16(), GURL(),
                           metrics::OmniboxEventProto::INVALID_SPEC, false,
                           false, true, true,
                           ChromeAutocompleteSchemeClassifier(&profile_));
   provider_->DoAnswersQuery(input);
   EXPECT_EQ(base::ASCIIToUTF16("weather los angeles"),
             provider_->prefetch_data_.full_query_text);
   EXPECT_EQ(base::ASCIIToUTF16("2334"), provider_->prefetch_data_.query_type);
 }
+
+TEST_F(SearchProviderTest, RemoveExtraAnswers) {
+  ACMatches matches;
+  AutocompleteMatch match1, match2, match3, match4, match5;
+  match1.answer_contents = base::ASCIIToUTF16("the answer");
+  match1.answer_type = base::ASCIIToUTF16("42");
+  match3.answer_contents = base::ASCIIToUTF16("not to play");
+  match3.answer_type = base::ASCIIToUTF16("1983");
+  match5.answer_contents = base::ASCIIToUTF16("a man");
+  match5.answer_type = base::ASCIIToUTF16("423");
+
+  matches.push_back(match1);
+  matches.push_back(match2);
+  matches.push_back(match3);
+  matches.push_back(match4);
+  matches.push_back(match5);
+
+  SearchProvider::RemoveExtraAnswers(&matches);
+  EXPECT_EQ(base::ASCIIToUTF16("the answer"), matches[0].answer_contents);
+  EXPECT_EQ(base::ASCIIToUTF16("42"), matches[0].answer_type);
+  EXPECT_TRUE(matches[1].answer_contents.empty());
+  EXPECT_TRUE(matches[1].answer_type.empty());
+  EXPECT_TRUE(matches[2].answer_contents.empty());
+  EXPECT_TRUE(matches[2].answer_type.empty());
+  EXPECT_TRUE(matches[3].answer_contents.empty());
+  EXPECT_TRUE(matches[3].answer_type.empty());
+  EXPECT_TRUE(matches[4].answer_contents.empty());
+  EXPECT_TRUE(matches[4].answer_type.empty());
+}