tvtots.c   [plain text]

#include "config.h"

#include "lfptest.h"
#include "timevalops.h"

#include "unity.h"

#include <math.h> /* Required on Solaris for ldexp. */

void test_Seconds(void);
void test_MicrosecondsRounded(void);
void test_MicrosecondsExact(void);

void
test_Seconds(void)
{
	struct timeval input = {500, 0}; /* 500.0 s */
	l_fp expected = {{500}, 0};
	l_fp actual;

	TVTOTS(&input, &actual);

	TEST_ASSERT_TRUE(IsEqual(expected, actual));
}


void
test_MicrosecondsRounded(void)
{
	/* 0.0005 can not be represented exact in a l_fp structure.
	 * It would equal to 2147483,648. This means that
	 * HALF_PROMILLE_UP (which is 2147484) should be
	 * the correct rounding. */

	struct timeval input = {0, 500}; /* 0.0005 exact */
	l_fp expected = {{0}, HALF_PROMILLE_UP};
	l_fp actual;

	TVTOTS(&input, &actual);

	TEST_ASSERT_TRUE(IsEqual(expected, actual));
}


void
test_MicrosecondsExact(void)
{
	/* 0.5 can be represented exact in both l_fp and timeval. */
	const struct timeval input = {10, 500000}; /* 0.5 exact */
	const l_fp expected = {{10}, HALF};        /* 0.5 exact */
	l_fp actual;

	TVTOTS(&input, &actual);

	/* Compare the fractional part with an absolute error given. */
	TEST_ASSERT_EQUAL_UINT(expected.l_ui, actual.l_ui);

	double expectedDouble, actualDouble;
	M_LFPTOD(0, expected.l_uf, expectedDouble);
	M_LFPTOD(0, actual.l_uf, actualDouble);

	/* The error should be less than 0.5 us */
	TEST_ASSERT_DOUBLE_WITHIN(0.0000005, expectedDouble, actualDouble);
}