BroadcastingConfigBootstrapper: test mapping credentials

Test that BroadcastingConfigBootstrapper correctly maps tenant properties to broadcasting config/credentials, and that the credentials don't leak when switching contexts. Also add the `$config` property to `TestingBroadcaster` so that we can access the credentials used by the broadcaster.

tests/BroadcastingTest.php

@@ -52,6 +52,48 @@ test('bound broadcaster instance is the same before initializing tenancy and aft
     expect($originalBroadcaster)->toBe(app(BroadcasterContract::class));
 });
 
+test('broadcasting config bootstrapper maps the config to broadcaster credentials correctly', function() {
+    config([
+        'broadcasting.default' => $driver = 'testing',
+        'broadcasting.connections.testing.driver' => $driver,
+        'broadcasting.connections.testing.key' => 'central_key',
+        'tenancy.bootstrappers' => [
+            BroadcastingConfigBootstrapper::class,
+        ],
+    ]);
+
+    BroadcastingConfigBootstrapper::$credentialsMap['broadcasting.connections.testing.key'] = 'testing_key';
+
+    // Register the testing broadcaster
+    app(BroadcastManager::class)->extend('testing', fn($app, $config) => new TestingBroadcaster('testing', $config));
+
+    $tenant1 = Tenant::create(['testing_key' => 'tenant1_key']);
+    $tenant2 = Tenant::create(['testing_key' => 'tenant2_key']);
+
+    expect(app(BroadcasterContract::class)->config['key'])->toBe('central_key');
+    expect(Broadcast::driver()->config['key'])->toBe('central_key');
+
+    tenancy()->initialize($tenant1);
+
+    // Switching to tenant context makes the currently bound Broadcaster instance use the tenant's config
+    expect(app(BroadcasterContract::class)->config['key'])->toBe('tenant1_key');
+    // The Broadcast facade (used in BroadcastController::authenticate) uses the broadcaster with tenant config
+    // instead of the stale broadcaster instance resolved before tenancy was initialized
+    expect(Broadcast::driver()->config['key'])->toBe('tenant1_key');
+
+    tenancy()->initialize($tenant2);
+
+    // Switching to another tenant context makes the current broadcaster use the new tenant's config
+    expect(app(BroadcasterContract::class)->config['key'])->toBe('tenant2_key');
+    expect(Broadcast::driver()->config['key'])->toBe('tenant2_key');
+
+    tenancy()->end();
+
+    // Ending tenancy reverts the broadcaster changes
+    expect(app(BroadcasterContract::class)->config['key'])->toBe('central_key');
+    expect(Broadcast::driver()->config['key'])->toBe('central_key');
+});
+
 test('new broadcasters get the channels from the previously bound broadcaster', function() {
     config(['tenancy.bootstrappers' => [BroadcastingConfigBootstrapper::class]]);
     config([

tests/Etc/TestingBroadcaster.php

@@ -6,7 +6,8 @@ use Illuminate\Broadcasting\Broadcasters\Broadcaster;
 
 class TestingBroadcaster extends Broadcaster {
     public function __construct(
-        public string $message = 'nothing'
+        public string $message = 'nothing',
+        public array $config = [],
     ) {}
 
     public function auth($request)