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tests: timeutil: test large linearity

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Add tests to ensure that conversions remain linear for large time deltas
when no skew is present.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
This commit is contained in:
Jordan Yates 2021-07-28 19:28:05 +10:00 • committed by Christopher Friedt
commit a9779bb2dc
1 changed files with 42 additions and 0 deletions
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42
tests/unit/timeutil/test_sync.c
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@ -357,6 +357,47 @@ static void test_local_from_ref(void)
tlocal_from_ref("ext", &cfg2); tlocal_from_ref("ext", &cfg2);
} }
static void test_large_linearity(void)
{
uint64_t inputs[] = {
1000ULL,
3999999999ULL,
4000000000ULL,
4000000001ULL,
UINT64_MAX / 10000000
};
uint64_t ref_out;
int64_t loc_out;
int rv;
const struct timeutil_sync_config unity = {
.ref_Hz = 1000,
.local_Hz = 1000,
};
struct timeutil_sync_instant inst = {
.ref = 200,
.local = 100
};
struct timeutil_sync_state ss = {
.cfg = &unity,
};
uint64_t offset = inst.ref - inst.local;
timeutil_sync_state_set_skew(&ss, 1.0f, &inst);
for (int i = 0; i < ARRAY_SIZE(inputs); i++) {
rv = timeutil_sync_ref_from_local(&ss, inputs[i], &ref_out);
zassert_equal(rv, 0, "Unexpected conversion fail");
zassert_equal(ref_out, inputs[i] + offset,
"Large unity local->ref conversion fail");
rv = timeutil_sync_local_from_ref(&ss, inputs[i], &loc_out);
zassert_equal(rv, 0, "Unexpected conversion fail");
zassert_equal(loc_out, inputs[i] - offset,
"Large unity ref->local conversion fail");
}
}
static void test_skew_to_ppb(void) static void test_skew_to_ppb(void)
{ {
float skew = 1.0; float skew = 1.0;
@ -392,5 +433,6 @@ void test_sync(void)
test_estimate_skew(); test_estimate_skew();
test_ref_from_local(); test_ref_from_local();
test_local_from_ref(); test_local_from_ref();
test_large_linearity();
test_skew_to_ppb(); test_skew_to_ppb();
} }