Factor out AutocompleteMatch creation from BookmarkProvider

components/bookmarks/browser/titled_url_match_unittest.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.

[Mark P, 2016/12/23 22:38:49]

Thanks for writing tests.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/bookmarks/browser/titled_url_match.h"
+
+#include "base/macros.h"
+#include "base/strings/utf_string_conversions.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace bookmarks {

[Mark P, 2016/12/23 22:38:49]

I don't usually see unit tests within a namespace.  If there's a reason for
this, please comment.

[mattreynolds, 2017/01/04 00:58:02]

I was copying bookmark_utils_unittest.cc which used the namespace to shorten
type names for BookmarkNode and other types. But, the same can be accomplished
with "using".

+
+using MatchPositions = TitledUrlMatch::MatchPositions;
+
+class TitledUrlMatchTest : public testing::Test {
+ public:
+  TitledUrlMatchTest() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TitledUrlMatchTest);
+};
+
+TEST_F(TitledUrlMatchTest, EmptyOffsetsForEmptyMatchPositions) {
+  auto offsets = TitledUrlMatch::OffsetsFromMatchPositions(MatchPositions());
+  EXPECT_TRUE(offsets.empty());
+}
+
+TEST_F(TitledUrlMatchTest, OffsetsFromMatchPositions) {
+  MatchPositions match_positions = {
+    {1, 3}, {4, 5}, {10, 15}, {base::string16::npos, base::string16::npos}

[Mark P, 2016/12/23 22:38:49]

I'm a little surprised to see npos in this list of match positions.  I didn't
think that was a valid match position.

[mattreynolds, 2017/01/04 00:58:02]

It's valid in a MatchPosition but not as an input to OffsetsFromMatchPositions,
so I'll remove it. When readjusting the offsets it's possible to get an npos in
some cases (I can't find the comment now but IIRC it had to do with trailing
slashes).

+  };
+  std::vector<size_t> expected_offsets = {
+    1, 3, 4, 5, 10, 15, base::string16::npos, base::string16::npos
+  };
+  auto offsets = TitledUrlMatch::OffsetsFromMatchPositions(match_positions);
+  EXPECT_TRUE(
+      std::equal(offsets.begin(), offsets.end(), expected_offsets.begin()));
+}
+
+TEST_F(TitledUrlMatchTest, ReplaceOffsetsInEmptyMatchPositions) {
+  auto match_positions = TitledUrlMatch::ReplaceOffsetsInMatchPositions(
+      MatchPositions(), std::vector<size_t>());
+  EXPECT_TRUE(match_positions.empty());
+}
+
+TEST_F(TitledUrlMatchTest, ReplaceOffsetsInMatchPositions) {
+  MatchPositions orig_match_positions = {{1, 3}, {4, 5}, {10, 15}};
+  std::vector<size_t> offsets = {0, 2, 3, 4, 9, 14};
+  MatchPositions expected_match_positions = {{0, 2}, {3, 4}, {9, 14}};
+  auto match_positions =
+      TitledUrlMatch::ReplaceOffsetsInMatchPositions(orig_match_positions,
+                                                     offsets);
+  EXPECT_TRUE(std::equal(match_positions.begin(), match_positions.end(),
+                         expected_match_positions.begin()));
+}
+
+TEST_F(TitledUrlMatchTest, ReplaceOffsetsRemovesItemsWithNposOffsets) {

[Mark P, 2016/12/23 22:38:49]

Can you please include one match in here that remains?

[mattreynolds, 2017/01/04 00:58:02]

Done.

+  MatchPositions orig_match_positions = {{1, 3}, {4, 5}, {10, 15}};
+  std::vector<size_t> offsets = {
+    0, base::string16::npos, base::string16::npos, 4,
+    base::string16::npos, base::string16::npos,
+  };
+  auto match_positions = TitledUrlMatch::ReplaceOffsetsInMatchPositions(
+      orig_match_positions, offsets);
+  EXPECT_TRUE(match_positions.empty());
+}
+
+TEST_F(TitledUrlMatchTest, CorrectTitleAndMatchPositions) {
+  MatchPositions match_positions = {{2, 6}, {10, 15}};
+  base::string16 title = base::ASCIIToUTF16("  Leading whitespace");
+  MatchPositions expected_match_positions = {{0, 4}, {8, 13}};
+  base::string16 expected_title = base::ASCIIToUTF16("Leading whitespace");
+  TitledUrlMatch::CorrectTitleAndMatchPositions(&title, &match_positions);
+  EXPECT_EQ(expected_title, title);
+  EXPECT_TRUE(std::equal(match_positions.begin(), match_positions.end(),
+                         expected_match_positions.begin()));
+}
+
+}  // namespace bookmarks