third_party/WebKit/Source/wtf/StringHasherTest.cpp

/*
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "wtf/StringHasher.h"

#include "testing/gtest/include/gtest/gtest.h"

namespace WTF {

namespace {

const LChar nullLChars[2] = {0, 0};
const UChar nullUChars[2] = {0, 0};

const unsigned emptyStringHash = 0x4EC889EU;
const unsigned singleNullCharacterHash = 0x3D3ABF44U;

const LChar testALChars[6] = {0x41, 0x95, 0xFF, 0x50, 0x01, 0};
const UChar testAUChars[6] = {0x41, 0x95, 0xFF, 0x50, 0x01, 0};
const UChar testBUChars[6] = {0x41, 0x95, 0xFFFF, 0x1080, 0x01, 0};

const unsigned testAHash1 = 0xEA32B004;
const unsigned testAHash2 = 0x93F0F71E;
const unsigned testAHash3 = 0xCB609EB1;
const unsigned testAHash4 = 0x7984A706;
const unsigned testAHash5 = 0x0427561F;

const unsigned testBHash1 = 0xEA32B004;
const unsigned testBHash2 = 0x93F0F71E;
const unsigned testBHash3 = 0x59EB1B2C;
const unsigned testBHash4 = 0xA7BCCC0A;
const unsigned testBHash5 = 0x79201649;

}  // anonymous namespace

TEST(StringHasherTest, StringHasher) {
  StringHasher hasher;

  // The initial state of the hasher.
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
}

TEST(StringHasherTest, StringHasher_addCharacter) {
  StringHasher hasher;

  // Hashing a single character.
  hasher = StringHasher();
  hasher.addCharacter(0);
  EXPECT_EQ(singleNullCharacterHash, hasher.hash());
  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            hasher.hashWithTop8BitsMasked());

  // Hashing five characters, checking the intermediate state after each is
  // added.
  hasher = StringHasher();
  hasher.addCharacter(testAUChars[0]);
  EXPECT_EQ(testAHash1, hasher.hash());
  EXPECT_EQ(testAHash1 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testAUChars[1]);
  EXPECT_EQ(testAHash2, hasher.hash());
  EXPECT_EQ(testAHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testAUChars[2]);
  EXPECT_EQ(testAHash3, hasher.hash());
  EXPECT_EQ(testAHash3 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testAUChars[3]);
  EXPECT_EQ(testAHash4, hasher.hash());
  EXPECT_EQ(testAHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testAUChars[4]);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());

  // Hashing a second set of five characters, including non-Latin-1 characters.
  hasher = StringHasher();
  hasher.addCharacter(testBUChars[0]);
  EXPECT_EQ(testBHash1, hasher.hash());
  EXPECT_EQ(testBHash1 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testBUChars[1]);
  EXPECT_EQ(testBHash2, hasher.hash());
  EXPECT_EQ(testBHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testBUChars[2]);
  EXPECT_EQ(testBHash3, hasher.hash());
  EXPECT_EQ(testBHash3 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testBUChars[3]);
  EXPECT_EQ(testBHash4, hasher.hash());
  EXPECT_EQ(testBHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testBUChars[4]);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
}

TEST(StringHasherTest, StringHasher_addCharacters) {
  StringHasher hasher;

  // Hashing zero characters.
  hasher = StringHasher();
  hasher.addCharacters(static_cast<LChar*>(0), 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(nullLChars, 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(static_cast<UChar*>(0), 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(nullUChars, 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());

  // Hashing one character.
  hasher = StringHasher();
  hasher.addCharacters(nullLChars, 1);
  EXPECT_EQ(singleNullCharacterHash, hasher.hash());
  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(nullUChars, 1);
  EXPECT_EQ(singleNullCharacterHash, hasher.hash());
  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            hasher.hashWithTop8BitsMasked());

  // Hashing five characters, all at once.
  hasher = StringHasher();
  hasher.addCharacters(testALChars, 5);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testAUChars, 5);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testBUChars, 5);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());

  // Hashing five characters, in groups of two, then the last one.
  hasher = StringHasher();
  hasher.addCharacters(testALChars, 2);
  EXPECT_EQ(testAHash2, hasher.hash());
  EXPECT_EQ(testAHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testALChars + 2, 2);
  EXPECT_EQ(testAHash4, hasher.hash());
  EXPECT_EQ(testAHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testALChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testALChars, 2);
  hasher.addCharacters(testALChars + 2, 2);
  hasher.addCharacters(testALChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testAUChars, 2);
  EXPECT_EQ(testAHash2, hasher.hash());
  EXPECT_EQ(testAHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testAUChars + 2, 2);
  EXPECT_EQ(testAHash4, hasher.hash());
  EXPECT_EQ(testAHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testAUChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testAUChars, 2);
  hasher.addCharacters(testAUChars + 2, 2);
  hasher.addCharacters(testAUChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testBUChars, 2);
  EXPECT_EQ(testBHash2, hasher.hash());
  EXPECT_EQ(testBHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testBUChars + 2, 2);
  EXPECT_EQ(testBHash4, hasher.hash());
  EXPECT_EQ(testBHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testBUChars + 4, 1);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testBUChars, 2);
  hasher.addCharacters(testBUChars + 2, 2);
  hasher.addCharacters(testBUChars + 4, 1);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());

  // Hashing five characters, the first three, then the last two.
  hasher = StringHasher();
  hasher.addCharacters(testALChars, 3);
  EXPECT_EQ(testAHash3, hasher.hash());
  EXPECT_EQ(testAHash3 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testALChars + 3, 2);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testALChars, 3);
  EXPECT_EQ(testAHash3, hasher.hash());
  EXPECT_EQ(testAHash3 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testALChars + 3, 2);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testAUChars, 3);
  EXPECT_EQ(testAHash3, hasher.hash());
  EXPECT_EQ(testAHash3 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testAUChars + 3, 2);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testAUChars, 3);
  EXPECT_EQ(testAHash3, hasher.hash());
  EXPECT_EQ(testAHash3 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testAUChars + 3, 2);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testBUChars, 3);
  EXPECT_EQ(testBHash3, hasher.hash());
  EXPECT_EQ(testBHash3 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacters(testBUChars + 3, 2);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharacters(testBUChars, 3);
  hasher.addCharacters(testBUChars + 3, 2);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
}

TEST(StringHasherTest, StringHasher_addCharactersAssumingAligned) {
  StringHasher hasher;

  // Hashing zero characters.
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(static_cast<LChar*>(0), 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(nullLChars, 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(static_cast<UChar*>(0), 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(nullUChars, 0);
  EXPECT_EQ(emptyStringHash, hasher.hash());
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, hasher.hashWithTop8BitsMasked());

  // Hashing one character.
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(nullLChars, 1);
  EXPECT_EQ(singleNullCharacterHash, hasher.hash());
  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(nullUChars, 1);
  EXPECT_EQ(singleNullCharacterHash, hasher.hash());
  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            hasher.hashWithTop8BitsMasked());

  // Hashing five characters, all at once.
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testALChars, 5);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testAUChars, 5);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testBUChars, 5);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());

  // Hashing five characters, in groups of two, then the last one.
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testALChars, 2);
  EXPECT_EQ(testAHash2, hasher.hash());
  EXPECT_EQ(testAHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testALChars + 2, 2);
  EXPECT_EQ(testAHash4, hasher.hash());
  EXPECT_EQ(testAHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testALChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testALChars, 2);
  hasher.addCharactersAssumingAligned(testALChars + 2, 2);
  hasher.addCharactersAssumingAligned(testALChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testAUChars, 2);
  EXPECT_EQ(testAHash2, hasher.hash());
  EXPECT_EQ(testAHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testAUChars + 2, 2);
  EXPECT_EQ(testAHash4, hasher.hash());
  EXPECT_EQ(testAHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testAUChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testAUChars, 2);
  hasher.addCharactersAssumingAligned(testAUChars + 2, 2);
  hasher.addCharactersAssumingAligned(testAUChars + 4, 1);
  EXPECT_EQ(testAHash5, hasher.hash());
  EXPECT_EQ(testAHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testBUChars, 2);
  EXPECT_EQ(testBHash2, hasher.hash());
  EXPECT_EQ(testBHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testBUChars + 2, 2);
  EXPECT_EQ(testBHash4, hasher.hash());
  EXPECT_EQ(testBHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testBUChars + 4, 1);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher = StringHasher();
  hasher.addCharactersAssumingAligned(testBUChars, 2);
  hasher.addCharactersAssumingAligned(testBUChars + 2, 2);
  hasher.addCharactersAssumingAligned(testBUChars + 4, 1);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());

  // Hashing five characters, first two characters one at a time,
  // then two more, then the last one.
  hasher = StringHasher();
  hasher.addCharacter(testBUChars[0]);
  EXPECT_EQ(testBHash1, hasher.hash());
  EXPECT_EQ(testBHash1 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharacter(testBUChars[1]);
  EXPECT_EQ(testBHash2, hasher.hash());
  EXPECT_EQ(testBHash2 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testBUChars[2], testBUChars[3]);
  EXPECT_EQ(testBHash4, hasher.hash());
  EXPECT_EQ(testBHash4 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
  hasher.addCharactersAssumingAligned(testBUChars + 4, 1);
  EXPECT_EQ(testBHash5, hasher.hash());
  EXPECT_EQ(testBHash5 & 0xFFFFFF, hasher.hashWithTop8BitsMasked());
}

TEST(StringHasherTest, StringHasher_computeHash) {
  EXPECT_EQ(emptyStringHash,
            StringHasher::computeHash(static_cast<LChar*>(0), 0));
  EXPECT_EQ(emptyStringHash, StringHasher::computeHash(nullLChars, 0));
  EXPECT_EQ(emptyStringHash,
            StringHasher::computeHash(static_cast<UChar*>(0), 0));
  EXPECT_EQ(emptyStringHash, StringHasher::computeHash(nullUChars, 0));

  EXPECT_EQ(singleNullCharacterHash, StringHasher::computeHash(nullLChars, 1));
  EXPECT_EQ(singleNullCharacterHash, StringHasher::computeHash(nullUChars, 1));

  EXPECT_EQ(testAHash5, StringHasher::computeHash(testALChars, 5));
  EXPECT_EQ(testAHash5, StringHasher::computeHash(testAUChars, 5));
  EXPECT_EQ(testBHash5, StringHasher::computeHash(testBUChars, 5));
}

TEST(StringHasherTest, StringHasher_computeHashAndMaskTop8Bits) {
  EXPECT_EQ(
      emptyStringHash & 0xFFFFFF,
      StringHasher::computeHashAndMaskTop8Bits(static_cast<LChar*>(0), 0));
  EXPECT_EQ(emptyStringHash & 0xFFFFFF,
            StringHasher::computeHashAndMaskTop8Bits(nullLChars, 0));
  EXPECT_EQ(
      emptyStringHash & 0xFFFFFF,
      StringHasher::computeHashAndMaskTop8Bits(static_cast<UChar*>(0), 0));
  EXPECT_EQ(emptyStringHash & 0xFFFFFF,
            StringHasher::computeHashAndMaskTop8Bits(nullUChars, 0));

  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            StringHasher::computeHashAndMaskTop8Bits(nullLChars, 1));
  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            StringHasher::computeHashAndMaskTop8Bits(nullUChars, 1));

  EXPECT_EQ(testAHash5 & 0xFFFFFF,
            StringHasher::computeHashAndMaskTop8Bits(testALChars, 5));
  EXPECT_EQ(testAHash5 & 0xFFFFFF,
            StringHasher::computeHashAndMaskTop8Bits(testAUChars, 5));
  EXPECT_EQ(testBHash5 & 0xFFFFFF,
            StringHasher::computeHashAndMaskTop8Bits(testBUChars, 5));
}

TEST(StringHasherTest, StringHasher_hashMemory) {
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, StringHasher::hashMemory(0, 0));
  EXPECT_EQ(emptyStringHash & 0xFFFFFF,
            StringHasher::hashMemory(nullUChars, 0));
  EXPECT_EQ(emptyStringHash & 0xFFFFFF, StringHasher::hashMemory<0>(0));
  EXPECT_EQ(emptyStringHash & 0xFFFFFF,
            StringHasher::hashMemory<0>(nullUChars));

  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            StringHasher::hashMemory(nullUChars, 2));
  EXPECT_EQ(singleNullCharacterHash & 0xFFFFFF,
            StringHasher::hashMemory<2>(nullUChars));

  EXPECT_EQ(testAHash5 & 0xFFFFFF, StringHasher::hashMemory(testAUChars, 10));
  EXPECT_EQ(testAHash5 & 0xFFFFFF, StringHasher::hashMemory<10>(testAUChars));
  EXPECT_EQ(testBHash5 & 0xFFFFFF, StringHasher::hashMemory(testBUChars, 10));
  EXPECT_EQ(testBHash5 & 0xFFFFFF, StringHasher::hashMemory<10>(testBUChars));
}

}  // namespace WTF