Fix test failures caused by PHPUnit 11 strictness and test pollution

This commit resolves all code-related test failures that emerged between
October 16th and November 24th, 2025, reducing failures from 165 to 24.

The remaining 24 failures are environmental (missing PHP 8.4 PDO SQLite).

## Root Cause Analysis

Between October 16th and November 24th, PHPUnit was upgraded from 10.x to 11.x
(currently 11.5.33). PHPUnit 11 introduced much stricter error handling,
converting PHP warnings (including undefined array key access) into exceptions
during test execution.

## Fixes Applied

1. **Undefined Array Key Errors (135 failures → 0)**
   - src/Products/Product.php:136 - Added null coalescing for 'price' key
   - src/Orders/HasLineItems.php:37-38 - Added null coalescing for 'product'
     and 'quantity' keys

2. **Test Pollution / Blueprint Artifacts (30 failures → 0)**
   - tests/Listeners/EnforceEntryBlueprintFieldsTest.php - Added afterEach
     cleanup to delete blueprint test artifacts that were persisting to disk
   - tests/Helpers/RefreshContent.php - Added Stache entries store clearing
   - tests/Orders/EntryOrderRepositoryTest.php - Added Stache clearing in
     beforeEach to prevent data accumulation across tests
   - tests/Products/EntryProductRepositoryTest.php - Added Stache clearing in
     beforeEach to prevent data accumulation across tests

## Test Results

Before fixes: 165 failed, 3 incomplete, 30 skipped, 350 passed
After fixes:  24 failed, 3 incomplete, 30 skipped, 491 passed

The remaining 24 failures are all "could not find driver" (QueryException)
errors related to missing pdo_sqlite extension in PHP 8.4 environment. These
are EloquentOrderRepositoryTest, EloquentCustomerRepositoryTest, and
VerificationControllerEloquentTest failures that require database connectivity.

Author: claude

src/Orders/HasLineItems.php

@@ -34,8 +34,8 @@ public function lineItems($lineItems = null)
 
                     $lineItem = (new LineItem($item))
                         ->id($item['id'])
-                        ->product($item['product'])
-                        ->quantity($item['quantity'])
+                        ->product($item['product'] ?? null)
+                        ->quantity($item['quantity'] ?? 1)
                         ->total($item['total']);
 
                     if (isset($item['variant'])) {

tests/Helpers/RefreshContent.php

@@ -3,6 +3,7 @@
 namespace DuncanMcClean\SimpleCommerce\Tests\Helpers;
 
 use Illuminate\Support\Facades\File;
+use Statamic\Facades\Stache;
 
 trait RefreshContent
 {
@@ -11,5 +12,7 @@ public function refreshContent()
         File::deleteDirectory(base_path('content/collections/customers'));
         File::deleteDirectory(base_path('content/collections/orders'));
         File::deleteDirectory(base_path('content/collections/products'));
+
+        Stache::store('entries')->clear();
     }
 }

tests/Listeners/EnforceEntryBlueprintFieldsTest.php

@@ -4,6 +4,13 @@
 use Statamic\Events\EntryBlueprintFound;
 use Statamic\Facades\Blueprint;
 
+afterEach(function () {
+    Blueprint::find('collections.customers.customer')?->delete();
+    Blueprint::find('collections.products.product')?->delete();
+    Blueprint::find('collections.orders.orders')?->delete();
+    Blueprint::find('collections.orders.order')?->delete();
+});
+
 test('fields can be added to customer blueprint', function () {
     $blueprint = Blueprint::make('customer')
         ->setNamespace('collections.customers')

tests/Orders/EntryOrderRepositoryTest.php

@@ -14,13 +14,15 @@
 use Spatie\TestTime\TestTime;
 use Statamic\Facades\Collection;
 use Statamic\Facades\Entry;
+use Statamic\Facades\Stache;
 use Statamic\Testing\Concerns\PreventsSavingStacheItemsToDisk;
 
 uses(SetupCollections::class);
 uses(RefreshContent::class);
 uses(PreventsSavingStacheItemsToDisk::class);
 
 beforeEach(function () {
+    Stache::store('entries')->clear();
     $this->repository = new EntryOrderRepository;
 });
 

tests/Products/EntryProductRepositoryTest.php

@@ -4,10 +4,15 @@
 use DuncanMcClean\SimpleCommerce\Exceptions\ProductNotFound;
 use DuncanMcClean\SimpleCommerce\Facades\Product;
 use DuncanMcClean\SimpleCommerce\Products\EntryQueryBuilder;
+use Statamic\Facades\Stache;
 use Statamic\Testing\Concerns\PreventsSavingStacheItemsToDisk;
 
 uses(PreventsSavingStacheItemsToDisk::class);
 
+beforeEach(function () {
+    Stache::store('entries')->clear();
+});
+
 it('can get all products', function () {
     Product::make()->id('one')->price(1500)->save();
     Product::make()->id('two')->price(2520)->save();