ladybird/AK/Tests/TestNumberFormat.cpp

/*
 * Copyright (c) 2020, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
 * 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 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 HOLDER 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 (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 <AK/TestSuite.h>

#include <AK/NumberFormat.h>

/*
 * These tests are mostly meant as a rough sanity-check, to see whether
 * human_readable_size() crashes or does something very silly. That, however,
 * is a fuzzy human term, so these tests have to hard-code the exact expected
 * strings.
 *
 * Please feel free to tweak human_readable_size()'s behavior, and update the
 * "expected" strings below.
 */

TEST_CASE(golden_path)
{
    EXPECT_EQ(human_readable_size(0), "0 B");
    EXPECT_EQ(human_readable_size(123), "123 B");
    EXPECT_EQ(human_readable_size(123 * KiB), "123.0 KiB");
    EXPECT_EQ(human_readable_size(123 * MiB), "123.0 MiB");
    EXPECT_EQ(human_readable_size(2 * GiB), "2.0 GiB");
}

TEST_CASE(border_B_KiB)
{
    EXPECT_EQ(human_readable_size(1000), "1000 B");
    EXPECT_EQ(human_readable_size(1023), "1023 B");
    // KiB = 1024
    EXPECT_EQ(human_readable_size(1024), "1.0 KiB");
    EXPECT_EQ(human_readable_size(1025), "1.0 KiB");
}

TEST_CASE(fraction_KiB)
{
    EXPECT_EQ(human_readable_size(1050), "1.0 KiB");
    EXPECT_EQ(human_readable_size(1075), "1.0 KiB");
    // 1024 * 1.05 = 1075.2
    EXPECT_EQ(human_readable_size(1076), "1.0 KiB");

    EXPECT_EQ(human_readable_size(1100), "1.0 KiB");

    EXPECT_EQ(human_readable_size(1126), "1.0 KiB");
    // 1024 * 1.1 = 1126.4
    EXPECT_EQ(human_readable_size(1127), "1.1 KiB");
    EXPECT_EQ(human_readable_size(1146), "1.1 KiB");
}

TEST_CASE(border_KiB_MiB)
{
    EXPECT_EQ(human_readable_size(1000 * KiB), "1000.0 KiB");
    EXPECT_EQ(human_readable_size(1024 * KiB - 1), "1023.9 KiB");
    // MiB
    EXPECT_EQ(human_readable_size(1024 * KiB), "1.0 MiB");
    EXPECT_EQ(human_readable_size(1024 * KiB + 1), "1.0 MiB");
}

TEST_CASE(fraction_MiB)
{
    EXPECT_EQ(human_readable_size(1069547), "1.0 MiB");
    EXPECT_EQ(human_readable_size(1101004), "1.0 MiB");
    // 1024 * 1024 * 1.05 = 1101004.8
    EXPECT_EQ(human_readable_size(1101005), "1.0 MiB");
    EXPECT_EQ(human_readable_size(1101006), "1.0 MiB");

    EXPECT_EQ(human_readable_size(1120000), "1.0 MiB");

    EXPECT_EQ(human_readable_size(1153433), "1.0 MiB");
    // 1024 * 1024 * 1.1 = 1153433.6
    EXPECT_EQ(human_readable_size(1153434), "1.1 MiB");
}

TEST_CASE(border_MiB_GiB)
{
    EXPECT_EQ(human_readable_size(1000 * MiB), "1000.0 MiB");
    EXPECT_EQ(human_readable_size(1024 * MiB - 1), "1023.9 MiB");
    EXPECT_EQ(human_readable_size(1024 * MiB), "1.0 GiB");
    EXPECT_EQ(human_readable_size(1024 * MiB + 1), "1.0 GiB");
}

TEST_CASE(fraction_GiB)
{
    EXPECT_EQ(human_readable_size(1095216660), "1.0 GiB");
    EXPECT_EQ(human_readable_size(1127428915), "1.0 GiB");
    // 1024 * 1024 * 1024 * 1.05 = 1127428915.2
    EXPECT_EQ(human_readable_size(1127428916), "1.0 GiB");
    EXPECT_EQ(human_readable_size(1127536289), "1.0 GiB");

    EXPECT_EQ(human_readable_size(1154272461), "1.0 GiB");

    EXPECT_EQ(human_readable_size(1181115968), "1.0 GiB");
    EXPECT_EQ(human_readable_size(1181115969), "1.0 GiB");
    EXPECT_EQ(human_readable_size(1181116000), "1.0 GiB");
    EXPECT_EQ(human_readable_size(1181116006), "1.0 GiB");
    // 1024 * 1024 * 1024 * 1.1 = 1181116006.4
    EXPECT_EQ(human_readable_size(1181116007), "1.1 GiB");
    EXPECT_EQ(human_readable_size(1202590842), "1.1 GiB");
}

TEST_CASE(extremes_4byte)
{
    EXPECT_EQ(human_readable_size(0x7fffffff), "1.9 GiB");
    EXPECT_EQ(human_readable_size(0x80000000), "2.0 GiB");
    EXPECT_EQ(human_readable_size(0xffffffff), "3.9 GiB");
}

template<int>
void actual_extremes_8byte();

template<>
void actual_extremes_8byte<4>()
{
    warnln("(Skipping 8-byte-size_t test)");
}

template<>
void actual_extremes_8byte<8>()
{
    warnln("(Running true 8-byte-size_t test)");
    // Your editor might show "implicit conversion" warnings here.
    // This is because your editor thinks the world is 32-bit, but it isn't.
    EXPECT_EQ(human_readable_size(0x100000000ULL), "4.0 GiB");
    EXPECT_EQ(human_readable_size(0x100000001ULL), "4.0 GiB");
    EXPECT_EQ(human_readable_size(0x800000000ULL), "32.0 GiB");
    EXPECT_EQ(human_readable_size(0x10000000000ULL), "1024.0 GiB");

    // Oh yeah! These are *correct*!
    EXPECT_EQ(human_readable_size(0x7fffffffffffffffULL), "8589934591.9 GiB");
    EXPECT_EQ(human_readable_size(0x8000000000000000ULL), "8589934592.0 GiB");
    EXPECT_EQ(human_readable_size(0xffffffffffffffffULL), "17179869183.9 GiB");
}

TEST_CASE(extremes_8byte)
{
    actual_extremes_8byte<sizeof(size_t)>();
}

TEST_MAIN(NumberFormat)