root/Source/wtf/ArrayBufferBuilderTest.cpp

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DEFINITIONS

This source file includes following definitions.
  1. TEST
  2. TEST
  3. TEST
  4. TEST
  5. TEST
  6. TEST
  7. TEST
  8. TEST
  9. TEST
  10. TEST
  11. TEST
  12. TEST
  13. TEST

/*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "wtf/ArrayBufferBuilder.h"

#include "wtf/Assertions.h"
#include <gtest/gtest.h>
#include <limits.h>
#include <string.h>

namespace WTF {

TEST(ArrayBufferBuilder, Constructor)
{
    ArrayBufferBuilder zeroBuilder(0);
    EXPECT_EQ(0u, zeroBuilder.byteLength());
    EXPECT_EQ(0u, zeroBuilder.capacity());

    ArrayBufferBuilder smallBuilder(1024);
    EXPECT_EQ(0u, zeroBuilder.byteLength());
    EXPECT_EQ(1024u, smallBuilder.capacity());

    ArrayBufferBuilder bigBuilder(2048);
    EXPECT_EQ(0u, zeroBuilder.byteLength());
    EXPECT_EQ(2048u, bigBuilder.capacity());
}

TEST(ArrayBufferBuilder, Append)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder(2 * dataSize);

    EXPECT_EQ(dataSize, builder.append(data, dataSize));
    EXPECT_EQ(dataSize, builder.byteLength());
    EXPECT_EQ(dataSize * 2, builder.capacity());

    EXPECT_EQ(dataSize, builder.append(data, dataSize));
    EXPECT_EQ(dataSize * 2, builder.byteLength());
    EXPECT_EQ(dataSize * 2, builder.capacity());

    EXPECT_EQ(dataSize, builder.append(data, dataSize));
    EXPECT_EQ(dataSize * 3, builder.byteLength());
    EXPECT_GE(builder.capacity(), dataSize * 3);
}

TEST(ArrayBufferBuilder, AppendRepeatedly)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder(37); // Some number coprime with dataSize.

    for (size_t i = 1; i < 1000U; ++i) {
        EXPECT_EQ(dataSize, builder.append(data, dataSize));
        EXPECT_EQ(dataSize * i, builder.byteLength());
        EXPECT_GE(builder.capacity(), dataSize * i);
    }
}

TEST(ArrayBufferBuilder, DefaultConstructorAndAppendRepeatedly)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder;

    for (size_t i = 1; i < 4000U; ++i) {
        EXPECT_EQ(dataSize, builder.append(data, dataSize));
        EXPECT_EQ(dataSize * i, builder.byteLength());
        EXPECT_GE(builder.capacity(), dataSize * i);
    }
}

TEST(ArrayBufferBuilder, AppendFixedCapacity)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder(15);
    builder.setVariableCapacity(false);

    EXPECT_EQ(dataSize, builder.append(data, dataSize));
    EXPECT_EQ(dataSize, builder.byteLength());
    EXPECT_EQ(15u, builder.capacity());

    EXPECT_EQ(5u, builder.append(data, dataSize));
    EXPECT_EQ(15u, builder.byteLength());
    EXPECT_EQ(15u, builder.capacity());

    EXPECT_EQ(0u, builder.append(data, dataSize));
    EXPECT_EQ(15u, builder.byteLength());
    EXPECT_EQ(15u, builder.capacity());
}

TEST(ArrayBufferBuilder, ToArrayBuffer)
{
    const char data1[] = "HelloWorld";
    size_t data1Size = sizeof(data1) - 1;

    const char data2[] = "GoodbyeWorld";
    size_t data2Size = sizeof(data2) - 1;

    ArrayBufferBuilder builder(1024);
    builder.append(data1, data1Size);
    builder.append(data2, data2Size);

    const char expected[] = "HelloWorldGoodbyeWorld";
    size_t expectedSize = sizeof(expected) - 1;

    RefPtr<ArrayBuffer> result = builder.toArrayBuffer();
    ASSERT_EQ(data1Size + data2Size, result->byteLength());
    ASSERT_EQ(expectedSize, result->byteLength());
    EXPECT_EQ(0, memcmp(expected, result->data(), expectedSize));
}

TEST(ArrayBufferBuilder, ToArrayBufferSameAddressIfExactCapacity)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder(dataSize);
    builder.append(data, dataSize);

    RefPtr<ArrayBuffer> result1 = builder.toArrayBuffer();
    RefPtr<ArrayBuffer> result2 = builder.toArrayBuffer();
    EXPECT_EQ(result1.get(), result2.get());
}

TEST(ArrayBufferBuilder, ToString)
{
    const char data1[] = "HelloWorld";
    size_t data1Size = sizeof(data1) - 1;

    const char data2[] = "GoodbyeWorld";
    size_t data2Size = sizeof(data2) - 1;

    ArrayBufferBuilder builder(1024);
    builder.append(data1, data1Size);
    builder.append(data2, data2Size);

    const char expected[] = "HelloWorldGoodbyeWorld";
    size_t expectedSize = sizeof(expected) - 1;

    String result = builder.toString();
    EXPECT_EQ(expectedSize, result.length());
    for (unsigned i = 0; i < result.length(); ++i)
        EXPECT_EQ(expected[i], result[i]);
}

TEST(ArrayBufferBuilder, ShrinkToFitNoAppend)
{
    ArrayBufferBuilder builder(1024);
    EXPECT_EQ(1024u, builder.capacity());
    builder.shrinkToFit();
    EXPECT_EQ(0u, builder.byteLength());
    EXPECT_EQ(0u, builder.capacity());
}

TEST(ArrayBufferBuilder, ShrinkToFit)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder(32);

    EXPECT_EQ(dataSize, builder.append(data, dataSize));
    EXPECT_EQ(dataSize, builder.byteLength());
    EXPECT_EQ(32u, builder.capacity());

    builder.shrinkToFit();
    EXPECT_EQ(dataSize, builder.byteLength());
    EXPECT_EQ(dataSize, builder.capacity());
}

TEST(ArrayBufferBuilder, ShrinkToFitFullyUsed)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder(dataSize);
    const void* internalAddress = builder.data();

    EXPECT_EQ(dataSize, builder.append(data, dataSize));
    EXPECT_EQ(dataSize, builder.byteLength());
    EXPECT_EQ(dataSize, builder.capacity());

    builder.shrinkToFit();
    // Reallocation should not happen.
    EXPECT_EQ(internalAddress, builder.data());
    EXPECT_EQ(dataSize, builder.byteLength());
    EXPECT_EQ(dataSize, builder.capacity());
}

TEST(ArrayBufferBuilder, ShrinkToFitAfterGrowth)
{
    const char data[] = "HelloWorld";
    size_t dataSize = sizeof(data) - 1;

    ArrayBufferBuilder builder(5);

    EXPECT_EQ(dataSize, builder.append(data, dataSize));
    EXPECT_GE(builder.capacity(), dataSize);
    builder.shrinkToFit();
    EXPECT_EQ(dataSize, builder.byteLength());
    EXPECT_EQ(dataSize, builder.capacity());
}

TEST(ArrayBufferBuilder, ArrayBufferAllocationFailure)
{
    RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(INT_MAX + 1u, 1);

    EXPECT_EQ(0, buffer.get());
}

} // namespace WTF

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