Macro test_set_constants 

macro_rules! test_set_constants {
    ($(
        $var_name:ident = $val:expr;
    )+) => { ... };
}

A macro for tests that sets HF_XET_<CONSTANT_NAME> to $value before the constant is initialized, and then checks that the constant actually picks up that value. If the constant was already accessed (thus initialized), or if it doesn’t match after being set, this macro panics.

Typically you would document the macro itself here, rather than placing doc comments above each call to test_set_constants!, because it doesn’t define a new item.

Example

use xet_runtime::{test_configurable_constants, test_set_constants};
test_configurable_constants! {
   /// Target chunk size
   ref CHUNK_TARGET_SIZE: u64 = 1024;

   /// Max Chunk size, only adjustable in testing mode.
   ref MAX_CHUNK_SIZE: u64 = 4096;
}

test_set_constants! {
   CHUNK_TARGET_SIZE = 2048;
}
assert_eq!(*CHUNK_TARGET_SIZE, 2048);