Allow heading tags (h1-h6) in ContentSanitizer so news editor headings render

tests/Unit/Enhance/EnhanceProcessorFactoryTest.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\EnhanceJob;
+use App\Services\Enhance\EnhanceProcessorFactory;
+use App\Services\Enhance\Processors\ExternalWorkerEnhanceProcessor;
+use App\Services\Enhance\Processors\StubEnhanceProcessor;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+uses(TestCase::class, RefreshDatabase::class);
+
+it('returns the stub processor for the stub engine', function (): void {
+    expect(app(EnhanceProcessorFactory::class)->make(EnhanceJob::ENGINE_STUB))->toBeInstanceOf(StubEnhanceProcessor::class);
+});
+
+it('returns the external worker processor for the external worker engine', function (): void {
+    expect(app(EnhanceProcessorFactory::class)->make(EnhanceJob::ENGINE_EXTERNAL_WORKER))->toBeInstanceOf(ExternalWorkerEnhanceProcessor::class);
+});
+
+it('throws for an unknown enhance processor engine', function (): void {
+    app(EnhanceProcessorFactory::class)->make('unknown-engine');
+})->throws(RuntimeException::class);