Revert "Remove spellcheck feedback."

chrome/browser/spellchecker/word_trimmer_unittest.cc

+// Copyright (c) 2011 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 "chrome/browser/spellchecker/word_trimmer.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using base::ASCIIToUTF16;
+
+TEST(WordTrimmerTest, TrimWordsEmptyText) {
+  size_t start = 0;
+  size_t end = 0;
+  EXPECT_EQ(base::string16(), TrimWords(&start, end, base::string16(), 0));
+  EXPECT_EQ(0UL, start);
+}
+
+TEST(WordTrimmerTest, TrimWordsStart) {
+  size_t start = 0;
+  size_t end = 3;
+  EXPECT_EQ(ASCIIToUTF16("one two three"),
+            TrimWords(&start, end, ASCIIToUTF16("one two three four"), 2));
+  EXPECT_EQ(0UL, start);
+}
+
+TEST(WordTrimmerTest, TrimWordsEnd) {
+  size_t start = 14;
+  size_t end = 18;
+  EXPECT_EQ(ASCIIToUTF16("two three four"),
+            TrimWords(&start, end, ASCIIToUTF16("one two three four"), 2));
+  EXPECT_EQ(10UL, start);
+}
+
+TEST(WordTrimmerTest, TrimWordsMiddle) {
+  size_t start = 14;
+  size_t end = 23;
+  EXPECT_EQ(ASCIIToUTF16("two three four five six seven"), TrimWords(
+      &start, end, ASCIIToUTF16("one two three four five six seven eight"), 2));
+  EXPECT_EQ(10UL, start);
+}
+
+TEST(WordTrimmerTest, TrimWordsEmptyKeep) {
+  size_t start = 18;
+  size_t end = 18;
+  EXPECT_EQ(ASCIIToUTF16("two three four five six"), TrimWords(
+      &start, end, ASCIIToUTF16("one two three four five six seven eight"), 2));
+  EXPECT_EQ(14UL, start);
+}
+
+TEST(WordTrimmerTest, TrimWordsOutOfBounds) {
+  size_t start = 4;
+  size_t end = 5;
+  EXPECT_EQ(ASCIIToUTF16("one"), TrimWords(
+      &start, end, ASCIIToUTF16("one"), 2));
+  EXPECT_EQ(4UL, start);
+}
+
+TEST(WordTrimmerTest, TrimWordsInvalid) {
+  size_t start = 23;
+  size_t end = 14;
+  EXPECT_EQ(ASCIIToUTF16("one two three four five six seven eight"), TrimWords(
+      &start, end, ASCIIToUTF16("one two three four five six seven eight"), 2));
+  EXPECT_EQ(23UL, start);
+}