Hi, currently CodeCoverage depends on code execution order.
I created a self contained repo that shows this behavior in https://github.com/Slamdunk/phpunit_codecoverage_bug#readme

Basically, given the following code:

/* 1 */ class A
/* 2 */ {
/* 3 */     public function inArray(): bool
/* 4 */     {
/* 5 */         return \in_array(1, [
/* 6 */             AType::OPT,
/* 7 */         ], true);
/* 8 */     }
/* 9 */ }

1. lines 6 and 7 are not considered LOC if AType was already loaded and parsed before the A is used in the test
2. otherwise if AType is unknown to PHP during inArray call, lines 6 and 7 are considered LOC.

This messes CodeCoverage merging in context like ParaTest where test execution is isolated but not deterministic.

Merging two CC reports coming from different tests run in different processes can result in something like this:

Which doesn't make much sense

I don't know if this library can do much about this, maybe @krakjoe and @derickr could help