From 76ea7b913373d1291a95706dfede7e48a812777e Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Fri, 26 Jun 2015 00:20:44 +0100 Subject: tests/stats: Make sure we properly invalidate the cached mean Sure, that's an implementation details, but make sure we do recompute the mean when we add a new value. Signed-off-by: Damien Lespiau --- lib/tests/igt_stats.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'lib/tests') diff --git a/lib/tests/igt_stats.c b/lib/tests/igt_stats.c index 172e4b32..f9081c76 100644 --- a/lib/tests/igt_stats.c +++ b/lib/tests/igt_stats.c @@ -45,6 +45,30 @@ static void test_mean(void) igt_stats_fini(&stats); } +static void test_invalidate_mean(void) +{ + igt_stats_t stats; + double mean1, mean2; + + igt_stats_init(&stats, 6); + + igt_stats_push(&stats, 2); + igt_stats_push(&stats, 4); + igt_stats_push(&stats, 6); + igt_stats_push(&stats, 8); + igt_stats_push(&stats, 10); + + mean1 = igt_stats_get_mean(&stats); + igt_assert(mean1 == (2 + 4 + 6 + 8 + 10) / 5.); + + igt_stats_push(&stats, 100); + + mean2 = igt_stats_get_mean(&stats); + igt_assert(mean1 != mean2); + + igt_stats_fini(&stats); +} + /* * Taken from the "Basic examples" section of: * https://en.wikipedia.org/wiki/Standard_deviation @@ -80,5 +104,6 @@ static void test_std_deviation(void) igt_simple_main { test_mean(); + test_invalidate_mean(); test_std_deviation(); } -- cgit v1.2.3