Unit-tests for removing words from the dictionary

chrome/browser/spellchecker/spellcheck_custom_dictionary.cc

 // Copyright (c) 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 "chrome/browser/spellchecker/spellcheck_custom_dictionary.h"
 
 #include "base/file_util.h"
 #include "base/string_split.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_constants.h"
@@ skipping 31 matching lines @@
 const WordList& SpellcheckCustomDictionary::GetWords() const {
   return words_;
 }
 
 void SpellcheckCustomDictionary::LoadDictionaryIntoCustomWordList(
     WordList* custom_words) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   std::string contents;
   file_util::ReadFileToString(custom_dictionary_path_, &contents);
-  if (contents.empty())
+  if (contents.empty()) {
+    custom_words->clear();
     return;
+  }
 
   base::SplitString(contents, '\n', custom_words);
   // Clear out empty words.
   custom_words->erase(remove_if(custom_words->begin(), custom_words->end(),
     mem_fun_ref(&std::string::empty)), custom_words->end());
 }
 
 void SpellcheckCustomDictionary::SetCustomWordList(WordList* custom_words) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
@@ skipping 141 matching lines @@
   return custom_words;
 }
 
 void SpellcheckCustomDictionary::SetCustomWordListAndDelete(
     WordList* custom_words) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   SetCustomWordList(custom_words);
   delete custom_words;
 }