On Fri, Apr 9, 2021 at 8:30 AM Andy Shevchenko andriy.shevchenko@linux.intel.com wrote:
On Thu, Apr 08, 2021 at 06:40:01PM -0700, Daniel Latypov wrote:
Add basic test coverage for files that don't require any config options:
- gcd.c
- lcm.c
- int_sqrt.c
- reciprocal_div.c
(Ignored int_pow.c since it's a simple textbook algorithm.)
What about adding math.h test cases?
We have some macros there and it might be a good idea to test them, for example that round_up() and roundup() produces the same output for the same (power of two divisor) input.
I completely overlooked the macros in math.h, sounds like a good idea.
Grepping around, seems like abs() and DIV_ROUND_UP/CLOSEST() are among the more popular macros: $ ag -s '\bDIV_ROUND_UP(' | wc -l 2946 $ ag -s '\babs(' | wc -l 923 $ ag -s '\bDIV_ROUND_CLOSEST(' | wc -l 864 $ ag -s '\bround_up(' | wc -l 727 $ ag -s '\broundup(' | wc -l 620 $ ag -s '\bround_down(' | wc -l 371 $ ag -s 'rounddown(' | wc -l 131
These tests aren't particularly interesting, but they
- provide short and simple examples of parameterized tests
- provide a place to add tests for any new files in this dir
- are written so adding new test cases to cover edge cases should be easy
Yes, that's why I think macros also can be a good example how to test *macro*.
Yeah, there's more to cover there since they have a range of types they can work on.
On another note, the parameterized test arrays all use unsigned long, so abs() sticks out even more. I'm thinking of something like
static void test_abs(struct kunit *test) { KUNIT_EXPECT_EQ(test, abs('a'), 'a'); KUNIT_EXPECT_EQ(test, abs(-'a'), 'a'); ... }
and then maybe use parameters for the other macros but also throw in an additional test case like
static void test_div_round_up_diff_types(struct kunit *test) { KUNIT_EXPECT_EQ(test, DIV_ROUND_UP((char) 42, (char) 10), (char) 4); KUNIT_EXPECT_EQ(test, DIV_ROUND_UP((int) 42, (int) 10), (int) 4); KUNIT_EXPECT_EQ(test, DIV_ROUND_UP((long) 42, (long) 10), (long) 4); ... }
-- With Best Regards, Andy Shevchenko
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