Testing

The library's tests

composer install
vendor/bin/phpunit --no-configuration tests

The suite covers every value and its refusals, the journal in memory through ActivityLogTestCase — the contract any journal passes —, the Journal and its observers, and the projector: batches, checkpoints, failures, rebuilds and live projections. In the monorepo, Infection holds the library at 100 % of covered mutants.

Testing code that records activity

Build the Journal over an InMemoryActivityLog with a clock you control, record through the code under test, then read the journal back:

$log = new InMemoryActivityLog();
$journal = new Journal($log, new MockClock('2026-11-07 12:00:00'));

$listener = new CommentPostedListener($journal);
$listener($event);
$listener($event); // a listener run twice

self::assertSame(1, $journal->totals(Filter::all()->verbs('news.commented'))->count);

A projection is tested the same way: append entries, run Projector::catchUp() with InMemoryCheckpoints, and look at its state; rebuild() checks that it resets what it should.