Stateful / model-based testing (Wave 4, 2.2.0)#8
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New Rasuvaeff\PropertyTesting\StateMachine namespace: the Command interface (preCondition/nextState/run/postCondition + Stringable label), the CommandSequence value, StateMachine::check() runner, and PostconditionViolation. Gen::commands() returns CommandSequenceArbitrary, which generates valid-by- construction command sequences and shrinks them by dropping command blocks (down to a single step, isolating a failing middle command) and simplifying each command's parameters; the runner skips any command whose precondition a dropped step invalidated. Also: counterexamples and verbose logs render Stringable arguments via __toString(), and a shrunk property reports the minimised run's failure rather than the original draw's. Docs: README/llms.txt sections, CHANGELOG 2.2.0, examples/state_machine.php, package AGENTS invariants, and ROADMAP updated to the 2-release plan (2.2.0 = Wave 4; 2.3.0 = Waves 5+6 merged).
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Wave 4 — stateful / model-based testing (
2.2.0)Tests sequences of operations against a simplified model and shrinks the
failing sequence to the shortest one that still breaks — the single biggest gap
vs. non-PHP property-testing libraries.
Public API (new
Rasuvaeff\PropertyTesting\StateMachinenamespace)Command extends \Stringable—preCondition($model),nextState($model),run($model, $system),postCondition($model, $result),__toString().Gen::commands($initialModel, $commandGenerators, $minLength = 0, $maxLength = 100)→
CommandSequenceArbitrary, generating valid-by-construction sequences.StateMachine::check(CommandSequence $sequence, Closure $systemFactory)— callfrom the property body; drives the sequence against a fresh system per run.
CommandSequence(\Stringablevalue) andPostconditionViolation.Design
Reuses the existing
#[Property]machinery: the command sequence is a normalarbitrary passed as one argument, so seed reproducibility,
maxShrinks,PROPERTY_RUNS/SEED/VERBOSEand reporting all come for free. Validity isenforced at run time, not shrink time — the runner skips any command whose
precondition a dropped/simplified step invalidated (fast-check model), so
shrinking stays a cheap pure list operation. Shrinking removes command blocks
(down to a single command, isolating a failing middle step) then simplifies each
command's parameters through its own tree.
Cross-cutting changes
\Stringablearguments via__toString()instead of the class name.Failure:line matches the
Shrunk:arguments.Verification
composer buildgreen — 394 tests.bc-checkvsv2.1.0: no backwards-incompatible changes (additive only).bound;
CommandSequence::__toStringempty-return / array_map unwrap).bin/package-audit: 0 errors, 0 warnings; all 4 examples run.Roadmap
Post-
2.1.0waves now ship as two minors instead of three:2.2.0= Wave 4(this PR);
2.3.0= Waves 5 + 6 merged. SeeROADMAP.md.