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diff --git a/chrome/browser/spellchecker_platform_engine_unittest.cc b/chrome/browser/spellchecker_platform_engine_unittest.cc
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+++ b/chrome/browser/spellchecker_platform_engine_unittest.cc
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+// Copyright (c) 2010 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 "base/string_util.h"
+#include "chrome/browser/spellchecker_platform_engine.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// Tests that words are properly ignored. Currently only enabled on OS X as it
+// is the only platform to support ignoring words. Note that in this test, we
+// supply a non-zero doc_tag, in order to test that ignored words are matched to
+// the correct document.
+TEST(PlatformSpellCheckTest, IgnoreWords_EN_US) {
+  const char* kTestCases[] = {
+    "teh",
+    "morblier",
+    "watre",
+    "noooen",
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTestCases); ++i) {
+    const string16 word(ASCIIToUTF16(kTestCases[i]));
+    const int doc_tag = SpellCheckerPlatform::GetDocumentTag();
+
+    // The word should show up as misspelled.
+    EXPECT_FALSE(SpellCheckerPlatform::CheckSpelling(word, doc_tag)) << word;
+
+    // Ignore the word.
+    SpellCheckerPlatform::IgnoreWord(word);
+
+    // The word should now show up as correctly spelled.
+    EXPECT_TRUE(SpellCheckerPlatform::CheckSpelling(word, doc_tag)) << word;
+
+    // Close the docuemnt. Any words that we had previously ignored should no
+    // longer be ignored and thus should show up as misspelled.
+    SpellCheckerPlatform::CloseDocumentWithTag(doc_tag);
+
+    // The word should now show be spelled wrong again
+    EXPECT_FALSE(SpellCheckerPlatform::CheckSpelling(word, doc_tag)) << word;
+  }
+}  // Test IgnoreWords_EN_US
+
+TEST(PlatformSpellCheckTest, SpellCheckSuggestions_EN_US) {
+  static const struct {
+    const char* input;           // A string to be tested.
+    const char* suggested_word;  // A suggested word that should occur.
+  } kTestCases[] = {
+    // We need to have separate test cases here, since hunspell and the OS X
+    // spellchecking service occasionally differ on what they consider a valid
+    // suggestion for a given word, although these lists could likely be
+    // integrated somewhat. The test cases for non-Mac are in
+    // chrome/renderer/spellcheck_unittest.cc
+    // These words come from the wikipedia page of the most commonly
+    // misspelled words in english.
+    // (http://en.wikipedia.org/wiki/Commonly_misspelled_words).
+    // However, 10.6 loads multiple dictionaries and enables many non-English
+    // dictionaries by default. As a result, we have removed from the list any
+    // word that is marked as correct because it is correct in another
+    // language.
+    {"absense", "absence"},
+    {"acceptible", "acceptable"},
+    {"accidentaly", "accidentally"},
+    {"acheive", "achieve"},
+    {"acknowlege", "acknowledge"},
+    {"acquaintence", "acquaintance"},
+    {"aquire", "acquire"},
+    {"aquit", "acquit"},
+    {"acrage", "acreage"},
+    {"adultary", "adultery"},
+    {"advertize", "advertise"},
+    {"adviseable", "advisable"},
+    {"alchohol", "alcohol"},
+    {"alege", "allege"},
+    {"allegaince", "allegiance"},
+    {"allmost", "almost"},
+    // Ideally, this test should pass. It works in firefox, but not in hunspell
+    // or OS X.
+    // {"alot", "a lot"},
+    {"amatuer", "amateur"},
+    {"ammend", "amend"},
+    {"amung", "among"},
+    {"anually", "annually"},
+    {"apparant", "apparent"},
+    {"artic", "arctic"},
+    {"arguement", "argument"},
+    {"athiest", "atheist"},
+    {"athelete", "athlete"},
+    {"avrage", "average"},
+    {"awfull", "awful"},
+    {"ballance", "balance"},
+    {"basicly", "basically"},
+    {"becuase", "because"},
+    {"becomeing", "becoming"},
+    {"befor", "before"},
+    {"begining", "beginning"},
+    {"beleive", "believe"},
+    {"bellweather", "bellwether"},
+    {"benifit", "benefit"},
+    {"bouy", "buoy"},
+    {"briliant", "brilliant"},
+    {"burgler", "burglar"},
+    {"camoflage", "camouflage"},
+    {"carefull", "careful"},
+    {"Carribean", "Caribbean"},
+    {"catagory", "category"},
+    {"cauhgt", "caught"},
+    {"cieling", "ceiling"},
+    {"cemetary", "cemetery"},
+    {"certin", "certain"},
+    {"changable", "changeable"},
+    {"cheif", "chief"},
+    {"citezen", "citizen"},
+    {"collaegue", "colleague"},
+    {"colum", "column"},
+    {"comming", "coming"},
+    {"commited", "committed"},
+    {"compitition", "competition"},
+    {"conceed", "concede"},
+    {"congradulate", "congratulate"},
+    {"consciencious", "conscientious"},
+    {"concious", "conscious"},
+    {"concensus", "consensus"},
+    {"contraversy", "controversy"},
+    {"conveniance", "convenience"},
+    {"critecize", "criticize"},
+    {"dacquiri", "daiquiri"},
+    {"decieve", "deceive"},
+    {"dicide", "decide"},
+    {"definate", "definite"},
+    {"definitly", "definitely"},
+    {"desparate", "desperate"},
+    {"develope", "develop"},
+    {"diffrence", "difference"},
+    {"disapear", "disappear"},
+    {"disapoint", "disappoint"},
+    {"disasterous", "disastrous"},
+    {"disipline", "discipline"},
+    {"drunkeness", "drunkenness"},
+    {"dumbell", "dumbbell"},
+    {"easely", "easily"},
+    {"eigth", "eight"},
+    {"embarass", "embarrass"},
+    {"enviroment", "environment"},
+    {"equiped", "equipped"},
+    {"equiptment", "equipment"},
+    {"exagerate", "exaggerate"},
+    {"exellent", "excellent"},
+    {"exsept", "except"},
+    {"exercize", "exercise"},
+    {"exilerate", "exhilarate"},
+    {"existance", "existence"},
+    {"experiance", "experience"},
+    {"experament", "experiment"},
+    {"explaination", "explanation"},
+    {"facinating", "fascinating"},
+    {"firey", "fiery"},
+    {"finaly", "finally"},
+    {"flourescent", "fluorescent"},
+    {"foriegn", "foreign"},
+    {"fourty", "forty"},
+    {"foreward", "forward"},
+    {"freind", "friend"},
+    {"fundemental", "fundamental"},
+    {"guage", "gauge"},
+    {"generaly", "generally"},
+    {"goverment", "government"},
+    {"gratefull", "grateful"},
+    {"garantee", "guarantee"},
+    {"guidence", "guidance"},
+    {"happyness", "happiness"},
+    {"harrass", "harass"},
+    {"heighth", "height"},
+    {"heirarchy", "hierarchy"},
+    {"humerous", "humorous"},
+    {"hygene", "hygiene"},
+    {"hipocrit", "hypocrite"},
+    {"idenity", "identity"},
+    {"ignorence", "ignorance"},
+    {"imaginery", "imaginary"},
+    {"immitate", "imitate"},
+    {"immitation", "imitation"},
+    {"imediately", "immediately"},
+    {"incidently", "incidentally"},
+    {"independant", "independent"},
+    {"indispensible", "indispensable"},
+    {"innoculate", "inoculate"},
+    {"inteligence", "intelligence"},
+    {"intresting", "interesting"},
+    {"interuption", "interruption"},
+    {"irrelevent", "irrelevant"},
+    {"irritible", "irritable"},
+    {"jellous", "jealous"},
+    {"knowlege", "knowledge"},
+    {"labratory", "laboratory"},
+    {"lenght", "length"},
+    {"liason", "liaison"},
+    {"libary", "library"},
+    {"lisence", "license"},
+    {"lonelyness", "loneliness"},
+    {"lieing", "lying"},
+    {"maintenence", "maintenance"},
+    {"manuever", "maneuver"},
+    {"marrige", "marriage"},
+    {"mathmatics", "mathematics"},
+    {"medcine", "medicine"},
+    {"miniture", "miniature"},
+    {"minite", "minute"},
+    {"mischevous", "mischievous"},
+    {"mispell", "misspell"},
+    // Maybe this one should pass, as it works in hunspell, but not in firefox.
+    // {"misterius", "mysterious"},
+    {"naturaly", "naturally"},
+    {"neccessary", "necessary"},
+    {"neice", "niece"},
+    {"nieghbor", "neighbor"},
+    {"nieghbour", "neighbor"},
+    {"niether", "neither"},
+    {"noticable", "noticeable"},
+    {"occassion", "occasion"},
+    {"occasionaly", "occasionally"},
+    {"occurrance", "occurrence"},
+    {"occured", "occurred"},
+    {"ommision", "omission"},
+    {"oppurtunity", "opportunity"},
+    {"outragous", "outrageous"},
+    {"parrallel", "parallel"},
+    {"parliment", "parliament"},
+    {"particurly", "particularly"},
+    {"passtime", "pastime"},
+    {"peculier", "peculiar"},
+    {"percieve", "perceive"},
+    {"pernament", "permanent"},
+    {"perseverence", "perseverance"},
+    {"personaly", "personally"},
+    {"persaude", "persuade"},
+    {"pichure", "picture"},
+    {"peice", "piece"},
+    {"plagerize", "plagiarize"},
+    {"playright", "playwright"},
+    {"plesant", "pleasant"},
+    {"pollitical", "political"},
+    {"posession", "possession"},
+    {"potatos", "potatoes"},
+    {"practicle", "practical"},
+    {"preceed", "precede"},
+    {"predjudice", "prejudice"},
+    {"presance", "presence"},
+    {"privelege", "privilege"},
+    // This one should probably work. It does in FF and Hunspell.
+    // {"probly", "probably"},
+    {"proffesional", "professional"},
+    {"promiss", "promise"},
+    {"pronounciation", "pronunciation"},
+    {"prufe", "proof"},
+    {"psycology", "psychology"},
+    {"publically", "publicly"},
+    {"quanity", "quantity"},
+    {"quarentine", "quarantine"},
+    {"questionaire", "questionnaire"},
+    {"readible", "readable"},
+    {"realy", "really"},
+    {"recieve", "receive"},
+    {"reciept", "receipt"},
+    {"reconize", "recognize"},
+    {"recomend", "recommend"},
+    {"refered", "referred"},
+    {"referance", "reference"},
+    {"relevent", "relevant"},
+    {"religous", "religious"},
+    {"repitition", "repetition"},
+    {"restarant", "restaurant"},
+    {"rythm", "rhythm"},
+    {"rediculous", "ridiculous"},
+    {"sacrefice", "sacrifice"},
+    {"saftey", "safety"},
+    {"sissors", "scissors"},
+    {"secratary", "secretary"},
+    {"seperate", "separate"},
+    {"sargent", "sergeant"},
+    {"shineing", "shining"},
+    {"similer", "similar"},
+    {"sinceerly", "sincerely"},
+    {"speach", "speech"},
+    {"strenght", "strength"},
+    {"succesful", "successful"},
+    {"supercede", "supersede"},
+    {"surelly", "surely"},
+    {"suprise", "surprise"},
+    {"temperture", "temperature"},
+    {"temprary", "temporary"},
+    {"tommorrow", "tomorrow"},
+    {"tounge", "tongue"},
+    {"truely", "truly"},
+    {"twelth", "twelfth"},
+    {"tyrany", "tyranny"},
+    {"underate", "underrate"},
+    {"untill", "until"},
+    {"unuseual", "unusual"},
+    {"upholstry", "upholstery"},
+    {"usible", "usable"},
+    {"useing", "using"},
+    {"usualy", "usually"},
+    {"vaccuum", "vacuum"},
+    {"vegatarian", "vegetarian"},
+    {"vehical", "vehicle"},
+    {"visious", "vicious"},
+    {"villege", "village"},
+    {"wierd", "weird"},
+    {"wellcome", "welcome"},
+    {"wellfare", "welfare"},
+    {"wilfull", "willful"},
+    {"withold", "withhold"},
+    {"writting", "writing"},
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTestCases); ++i) {
+    const string16 word(ASCIIToUTF16(kTestCases[i].input));
+    EXPECT_FALSE(SpellCheckerPlatform::CheckSpelling(word, 0)) << word;
+
+    // Check if the suggested words occur.
+    std::vector<string16> suggestions;
+    SpellCheckerPlatform::FillSuggestionList(word, &suggestions);
+    bool suggested_word_is_present = false;
+    const string16 suggested_word(ASCIIToUTF16(kTestCases[i].suggested_word));
+    for (size_t j = 0; j < suggestions.size(); j++) {
+      if (suggestions[j].compare(suggested_word) == 0) {
+        suggested_word_is_present = true;
+        break;
+      }
+    }
+    EXPECT_TRUE(suggested_word_is_present) << suggested_word;
+  }
+}