Testing Laravel Package

Getting Started

• Install for the new PHP 8 floor. v5.1.0 is the first release that advertises PHP 8 support, so the install command is the same but the constraint matters:

  composer require vendor/package:^5.1
  

  If your composer.json pins platform.php to 7.4, Composer will happily resolve to an older 5.0.x — verify with composer show vendor/package that you actually landed on 5.1.x.
• Look first at: the package's composer.json (require.php and illuminate/* constraints), the service provider's register()/boot(), and any published config file. On a 5.x line the config schema is the thing most likely to have drifted, not the public API.
• First use case: boot the package in a scratch Laravel app on PHP 8.0/8.1, publish its config, and exercise the single most common entry point (a facade call, an injected contract, or an Artisan command) before wiring it into a real application. The point of the smoke test is to surface PHP 8 fatals — signature mismatches, null passed to non-nullable internal params — at install time rather than in production.
• Check the upgrade path before you commit. If you're coming from 5.0.x, read the changelog for 5.0.0 as well: the 5.1.0 note only mentions PHP 8, which usually means the 5.0 line already carried the breaking changes and 5.1 is a compatibility release.

Implementation Patterns

• Constraint strategy. Use "vendor/package": "^5.1" and let Composer pick the patch. If you support both PHP 7.4 and 8.x across environments (common with a shared codebase), the release is only useful to you if the package's own constraint is a union — otherwise keep separate lock files per PHP version rather than trying to satisfy both.
• CI matrix as the day-to-day integration point. Add PHP 8.0 and 8.1 to the matrix alongside your existing versions. This is the cheapest way to catch a package that declares PHP 8 support but has untyped or implicitly-nullable signatures that only warn under 8.1.
• Bind through the container, don't resolve the facade in domain code. Wrap the package behind a small application-level interface and bind the package implementation in a service provider. That keeps the 5.1 → 6.0 upgrade contained to one file and makes the package swappable in tests.
• Config-first over code-first. Publish the config and drive behaviour from config/package.php plus env vars. Laravel's config:cache will freeze these at deploy, so any value that must change at runtime belongs in a DB setting or a call-site argument, not the config file.
• Queue and event boundaries. If the package dispatches events or jobs, they're serialized into your queue payloads. After upgrading, drain or version your queues before deploying — old serialized payloads referencing 5.0 class shapes will fail to unserialize on workers running 5.1.
• Test isolation. Use the package's fake/swap hooks in setUp() rather than hitting its real backend. Where none exist, bind a stub of the container contract in a test service provider and assert against that.
• Staged rollout. Ship to a staging box on PHP 8.1 first, run the app's full test suite plus one real workload, then promote. PHP 8's stricter internal function signatures tend to fail loudly but only on the code paths you actually exercise.

Gotchas and Tips

• "Supports PHP 8" ≠ "supports PHP 8.1/8.2/8.3." The note gives no upper bound detail. Run composer why-not vendor/package 5.1.* and read the actual require.php constraint; a ^8.0 cap or a missing 8.2 in the constraint will silently hold you back. PHP 8.4's implicit-nullable deprecation is a separate risk entirely.
• Platform pinning masks the upgrade. A config.platform.php of 7.4 in composer.json (very common for Docker parity) will resolve 5.0.x indefinitely. Change the pin and the lock file together, otherwise CI and prod disagree about which version is installed.
• composer update vs composer require. Bumping a single package with composer update vendor/package --with-dependencies is safer than a blanket update, which can drag illuminate/* across a major version. If Laravel itself moves, check the package's Laravel constraint before assuming compatibility.
• Silent deprecation noise. On 8.1+ you may see ReturnTypeWillChange or dynamic-property deprecations originating inside the package. These are not failures but will flood logs and can be promoted to exceptions by strict error handlers (Laravel's Handler or Sentry's error_types). Filter at the handler level rather than patching vendor code.
• Debugging the boot. When something misbehaves, use php artisan about, then php artisan tinker to resolve the package's contract and inspect it directly. For container issues, php artisan package:discover and the bootstrap/cache/packages.php manifest reveal whether auto-discovery registered the provider at all.
• Extension points. Prefer the package's published config and container bindings over subclassing its internals. If you must override behaviour, rebind after the package's provider registers (i.e. in your own AppServiceProvider::register(), or via $this->app->extend()), and pin the package to ^5.1 — internal classes are the least stable surface across a minor bump.
• Verify the release's real scope. A one-line changelog doesn't prove the diff is one line. Before relying on 5.1.0, skim the tagged diff for signature changes and any newly deprecated methods, so you're not the first to discover them in production.