[Tarantool-patches] [PATCH v4] core: introduce evenly distributed int64 random in range

[Vladislav Shpilevoy]

Hi! Thanks for the fixes!

I hope we will end this eventually :)

See 2 comments below.

> diff --git a/test/unit/random.c b/test/unit/random.c
> new file mode 100644
> index 000000000..858ff7867
> --- /dev/null
> +++ b/test/unit/random.c
> @@ -0,0 +1,56 @@
> +#include <core/random.h>
> +
> +#include <stdio.h>
> +#include <assert.h>
> +
> +#include "unit.h"
> +
> +static void
> +test_random_in_range_one(int64_t min, int64_t max)
> +{
> +	int64_t result = pseudo_random_in_range(min, max);
> +	assert(min <= result && result <= max);
> +	if (min == max)
> +		printf("pseudo_random_in_range(%lld, %lld) = %lld\n",
> +		       (long long)min, (long long)max, (long long)result);
> +
> +	result = real_random_in_range(min, max);
> +	assert(min <= result && result <= max);
> +	if (min == max)
> +		printf("real_random_in_range(%lld, %lld) = %lld\n",
> +		      (long long)min, (long long)max, (long long)result);

1. By using printf as a checker you complicate Sergey's life in scope
of this https://github.com/tarantool/tarantool/issues/5000. Because your
output is not TAP. Better not print anything except via helpers from
unit.h, and use ok()/is()/isnt() for actual tests.

> +}
> diff --git a/test/unit/swim_test_utils.c b/test/unit/swim_test_utils.c
> index 9dbd28a9f..7ac43d82d 100644
> --- a/test/unit/swim_test_utils.c
> +++ b/test/unit/swim_test_utils.c
> @@ -875,7 +875,8 @@ swim_run_test(const char *log_file, fiber_func test)
>  	 * Print the seed to be able to reproduce a bug with the
>  	 * same seed.
>  	 */
> -	say_info("Random seed = %llu", (unsigned long long) seed);
> +	say_info("Random seed = %llu", (unsigned long long)seed);

2. Why did you change this line?