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root/software/fixed/fixed_test.cc @ 92782e4a
#include <cstdint>
#include <limits>
#include <random>
#include <sstream>
#include <string>
#include <vector>

#define BOOST_TEST_MAIN 1
#include <boost/test/unit_test.hpp>

#include "fixed.h"

BOOST_AUTO_TEST_CASE(t0)
{
/* TEST CASE 0: Check storage sizes (in bytes) of all predefined fixed
* point types.
*/
fixed_8_8 f_8_8;
fixed_8_32 f_8_32;
fixed_8_16 f_8_16;
fixed_8_64 f_8_64;
BOOST_CHECK(sizeof(f_8_8) == 2);
BOOST_CHECK(sizeof(f_8_16) == 4);
BOOST_CHECK(sizeof(f_8_32) == 8);
BOOST_CHECK(sizeof(f_8_64) == 16);
fixed_16_8 f_16_8;
fixed_16_16 f_16_16;
fixed_16_32 f_16_32;
fixed_16_64 f_16_64;
BOOST_CHECK(sizeof(f_16_8) == 4);
BOOST_CHECK(sizeof(f_16_16) == 4);
BOOST_CHECK(sizeof(f_16_32) == 8);
BOOST_CHECK(sizeof(f_16_64) == 16);
fixed_32_8 f_32_8;
fixed_32_16 f_32_16;
fixed_32_32 f_32_32;
fixed_32_64 f_32_64;
BOOST_CHECK(sizeof(f_32_8) == 8);
BOOST_CHECK(sizeof(f_32_16) == 8);
BOOST_CHECK(sizeof(f_32_32) == 8);
BOOST_CHECK(sizeof(f_32_64) == 16);
fixed_64_8 f_64_8;
fixed_64_16 f_64_16;
fixed_64_32 f_64_32;
fixed_64_64 f_64_64;
BOOST_CHECK(sizeof(f_64_8) == 16);
BOOST_CHECK(sizeof(f_64_16) == 16);
BOOST_CHECK(sizeof(f_64_32) == 16);
BOOST_CHECK(sizeof(f_64_64) == 16);
}

BOOST_AUTO_TEST_CASE(t1)
{
/* TEST CASE 1: Test basic comparisons
*/
fixed_64_64 val1(100, 1, 0);
fixed_64_64 val2(100, 1);
BOOST_CHECK( (val1 == val2));
BOOST_CHECK(! (val1 != val2));
BOOST_CHECK(! (val1 > val2));
BOOST_CHECK(! (val1 < val2));
BOOST_CHECK( (val1 >= val2));
BOOST_CHECK( (val1 <= val2));
val2.assignUnscaledFrac(100, 1, 18);
BOOST_CHECK(! (val1 == val2));
BOOST_CHECK( (val1 != val2));
BOOST_CHECK( (val1 > val2));
BOOST_CHECK(! (val1 < val2));
BOOST_CHECK( (val1 >= val2));
BOOST_CHECK(! (val1 <= val2));
}

BOOST_AUTO_TEST_CASE(t2)
{
/* TEST CASE 2: Test parsing with leading zeros.
*/
fixed_64_64 val1;
fixed_64_64 val2;

// 1
val1.assign(1, 2000000000000000000);
val2.parse("1.2");
BOOST_CHECK(val1 == val2);

// 2
val1.assign(1, 200000000000000000);
val2.parse("1.02");
BOOST_CHECK(val1 == val2);

// 3
val1.assign(1, 20000000000000000);
val2.parse("1.002");
BOOST_CHECK(val1 == val2);

// 4
val1.assign(1, 2000000000000000);
val2.parse("1.0002");
BOOST_CHECK(val1 == val2);

// 5
val1.assign(1, 200000000000000);
val2.parse("1.00002");
BOOST_CHECK(val1 == val2);

// 6
val1.assign(1, 20000000000000);
val2.parse("1.000002");
BOOST_CHECK(val1 == val2);

// 7
val1.assign(1, 2000000000000);
val2.parse("1.0000002");
BOOST_CHECK(val1 == val2);

// 8
val1.assign(1, 200000000000);
val2.parse("1.00000002");
BOOST_CHECK(val1 == val2);

// 9
val1.assign(1, 20000000000);
val2.parse("1.000000002");
BOOST_CHECK(val1 == val2);

// 10
val1.assign(1, 2000000000);
val2.parse("1.0000000002");
BOOST_CHECK(val1 == val2);

// 11
val1.assign(1, 200000000);
val2.parse("1.00000000002");
BOOST_CHECK(val1 == val2);

// 12
val1.assign(1, 20000000);
val2.parse("1.000000000002");
BOOST_CHECK(val1 == val2);

// 13
val1.assign(1, 2000000);
val2.parse("1.0000000000002");
BOOST_CHECK(val1 == val2);

// 14
val1.assign(1, 200000);
val2.parse("1.00000000000002");
BOOST_CHECK(val1 == val2);

// 15
val1.assign(1, 20000);
val2.parse("1.000000000000002");
BOOST_CHECK(val1 == val2);

// 16
val1.assign(1, 2000);
val2.parse("1.0000000000000002");
BOOST_CHECK(val1 == val2);

// 17
val1.assign(1, 200);
val2.parse("1.00000000000000002");
BOOST_CHECK(val1 == val2);

// 18
val1.assign(1, 20);
val2.parse("1.000000000000000002");
BOOST_CHECK(val1 == val2);

// 19
val1.assign(1, 2);
val2.parse("1.0000000000000000002");
BOOST_CHECK(val1 == val2);
}

BOOST_AUTO_TEST_CASE(t3)
{
/* TEST CASE 3: Test parsing and printing randomly generated values
*/
using theType = fixed_64_64;

uint32_t NUMBER = 1000000;
uint64_t SEED = 0xDEADBEEF123;
std::random_device dev;
std::mt19937 rng;
rng.seed(SEED);
std::uniform_int_distribution<std::mt19937::result_type> intDigits(1, theType::integer_decimal_digits);
std::uniform_int_distribution<std::mt19937::result_type> fracDigits(1, theType::fractional_decimal_digits);
std::uniform_int_distribution<std::mt19937::result_type> digits(0, 9);
// Generate NUMBER worth of parsable decimal number strings
std::vector<std::string> values;
for (uint32_t idx = 0; idx < NUMBER; ++idx)
{
std::ostringstream output;
// Generate random integer number digits
for (uint32_t integerIdx = 0; integerIdx < intDigits(rng); ++integerIdx)
{
int digit = digits(rng);
// Integer part cannot start with a zero
if (integerIdx == 0)
{
while (digit == 0)
{
digit = digits(rng);
}
}
output << digit;
}
output << ".";
// Generate random fractional number digits
int numFracDigits = fracDigits(rng);
for (uint32_t fracIdx = 0; fracIdx < numFracDigits; ++fracIdx)
{
int digit = digits(rng);
// Fractional part cannot end with a zero
if (fracIdx == (numFracDigits - 1))
{
while (digit == 0)
{
digit = digits(rng);
}
}
output << digit;
}
values.emplace_back(output.str());
//~ std::cout << "VAL: " << values.back() << std::endl;
}
// Now validate that the output of the parsed
theType fixedValue;
std::ostringstream output;
for (auto& value : values)
{
fixedValue.parse(value.c_str());
output << fixedValue;
//~ std::cout << "TEST: " << output.str() << " -- " << value << std::endl;
BOOST_CHECK(output.str() == value);
output.str("");
}
}

BOOST_AUTO_TEST_CASE(t4)
{
/* TEST CASE 4: Basic test division by unsigned integer
*/
fixed_64_64 val1(18, 55, 0);
fixed_64_64 val2(0, 1855, 0);
fixed_64_64 answer = val1 / 100;
BOOST_CHECK(answer == val2);
}


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