tests: Better suite creation

While the previous method of in-lining a stack allocated array of
tests into the suite struct declaration was nice, we had to update
size manually.

This macro will allow us to just append new tests to the suite without
having to care for that.  It generates a uniquely named variable for
the test array, then uses that test array in the suite declaration.
Nice and easy.

test/test.h

@@ -61,8 +61,13 @@ typedef struct
   const u64 size;
 } test_suite_t;
 
-#define MAKE_TEST_SUITE(NAME) \
-  {.name = #NAME, .tests = NAME, .size = ARRSIZE(NAME)}
+#define MAKE_TEST_SUITE(NAME, DESC, ...)        \
+  const test_fn NAME##_TESTS[] = {__VA_ARGS__}; \
+  const test_suite_t NAME      = {              \
+           .name  = DESC,                       \
+           .tests = NAME##_TESTS,               \
+           .size  = ARRSIZE(NAME##_TESTS),      \
+  }
 
 #endif