tests/unit/test-throttle: Avoid unintended integer division

In test_compute_wait() we do
 double units = bkt.max / 10;
which does an integer division and then assigns it to a double variable,
and similarly later on in the expression for an assertion.

Use 10.0 so that we do a floating point division and calculate the
exact value, rather than doing an integer division.

Spotted by Coverity.

Resolves: Coverity CID 1432564
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240312183810.557768-7-peter.maydell@linaro.org

diff --git a/tests/unit/test-throttle.c b/tests/unit/test-throttle.c
index 2146cfacd3635723aa6a5ea1dc8d29da5d4204cc..24032a026671c6537956c2303f9ad39deed23794 100644 (file)
--- a/tests/unit/test-throttle.c
+++ b/tests/unit/test-throttle.c
@@ -127,13 +127,13 @@ static void test_compute_wait(void)
     bkt.avg = 10;
     bkt.max = 200;
     for (i = 0; i < 22; i++) {
-        double units = bkt.max / 10;
+        double units = bkt.max / 10.0;
         bkt.level += units;
         bkt.burst_level += units;
         throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 10);
         wait = throttle_compute_wait(&bkt);
         g_assert(double_cmp(bkt.burst_level, 0));
-        g_assert(double_cmp(bkt.level, (i + 1) * (bkt.max - bkt.avg) / 10));
+        g_assert(double_cmp(bkt.level, (i + 1) * (bkt.max - bkt.avg) / 10.0));
         /* We can do bursts for the 2 seconds we have configured in
          * burst_length. We have 100 extra milliseconds of burst
          * because bkt.level has been leaking during this time.