Phpunit Matrix Data Provider Laravel Package

Product Decisions This Supports

• Test-matrix coverage decisions: When a feature has several independent dimensions (e.g. payment provider × currency × locale × shipping tier × customer segment), this package lets the team express "test every combination" declaratively. That directly informs whether a release is safe to ship across the full configuration surface, not just the happy path.
• Build vs. buy (vs. copy) for test tooling: The package is a ~single-purpose Cartesian-product data provider. The real decision it surfaces is whether test-infrastructure utilities should be pulled from Packagist at all, or vendored as a small internal helper. Its existence is a useful reference implementation, even if the answer is "write our own 20-line provider."
• Roadmap scoping for combinatorial risk: If the product roadmap adds new axes (a new region, a new payment method, a new plan tier), the combinatorial explosion becomes a roadmap risk. A matrix provider makes that cost visible early — 4 × 5 × 3 × 2 = 120 cases is a budget conversation, not a QA surprise.
• Regression-suite strategy: Supports decisions about pairwise vs. full-factorial testing. If full combinations are cheap enough to run in CI, you can justify skipping a combinatorial reduction tool; if not, this package helps you measure the blow-up before committing.
• Use cases worth naming: pricing/promo eligibility matrices, tax and billing-address permutations, permission/role × resource × action authorization tables, feature-flag combinations, serialization/format compatibility, and API version × client-version support windows.
• Not a product differentiator: This is internal engineering leverage. It should be evaluated as a productivity/quality investment, not as a customer-facing capability, and it should never appear on a customer roadmap.

When to Consider This Package

Consider it when all of the following hold:

• Your stack is PHP / Laravel with PHPUnit and tests already use data providers idiomatically.
• You have two or more genuinely independent input dimensions per test and the correctness bug you fear lives at the intersection, not in any single dimension.
• The combination count is bounded and known (dozens to a few hundred), so full-factorial testing fits a CI budget.
• You want the matrix declared inline in the test, readable by a reviewer, with no external fixture files or config DSL.
• You are comfortable treating it as a throwaway utility — the risk profile of a 0-star, 0-dependent, single-maintainer package is high, so you must be willing to fork or reimplement it in an afternoon. Vendoring the source into a tests/Support directory is a legitimate adoption path.

Look elsewhere — or write it yourself — when:

• You need pairwise / orthogonal-array reduction (all-pairs) rather than full Cartesian product; this package does not solve the explosion problem, it creates it.
• Combinations run into the thousands, where you need sharding, parallelization, or a test-selection/orchestration tool instead.
• You are on Pest, or on PHPUnit versions where data-provider semantics differ; the package targets a specific PHPUnit data-provider contract and 0 stars means no community pressure to keep pace with PHPUnit majors.
• You need maintained, supported, or audited dependencies — no releases cadence, no issue history, no security posture to point at.
• The matrix is really a table of named scenarios with expected outcomes. A hand-written named-cases provider documents intent better than a blind product; generated combinations obscure why a case exists.
• Your team already has a base test case or trait that generates combinations; adding a dependency for the same behavior is net negative.

Practical caveat for the pitch: the value here is the pattern, not the package. Any competent PHP engineer can produce the same behavior with a nested foreach and a generator in well under an hour, and that version has zero supply-chain risk and can be typed and documented to your standards.

How to Pitch It (Stakeholders)

For executives: This is a small, free (MIT) testing utility that lets our engineers verify a feature works across every combination of its settings, rather than a hand-picked few. For products with configurable dimensions — regions, currencies, plans, payment methods, permission levels — that is where expensive production bugs hide. The cost is effectively zero and the effort is measured in hours. The caveat is equally small: the package is a single-purpose helper with no adoption and no maintenance guarantees, so we would copy its approach into our own codebase rather than depend on it long-term. Recommend: adopt the pattern internally, do not add it as a supported dependency.

For engineering leadership: It removes boilerplate around PHPUnit data providers when you need a full Cartesian product of input dimensions. It is roughly a one-function library; we can vendor it into tests/Support or reimplement it with a typed generator in an afternoon, which eliminates the 0-star supply-chain and PHPUnit-version-compatibility risk entirely. Pair it with a conversation about pairwise reduction once any single matrix crosses ~200 cases, because full-factorial growth is the failure mode.

For the engineering team: Use it (or our copy of it) where the interaction between parameters is the risk — pricing rules, authorization tables, tax permutations, feature-flag combinations. Do not use it to enumerate scenarios that deserve individual names and individual assertions; a generated matrix tells you something broke but not what the case was supposed to prove. Keep each matrix under a few hundred cases, keep the dimension arrays readable, and give the resulting test a name that states the invariant being defended.