Test reverting to central credentials after a tenant with overrides

The existing assertions only ran after a tenant without credential overrides, so a tenant broadcaster leaking into central context could hold the central key anyway and go unnoticed

(works as a regression for the forgetDrivers() refactor)

Author: lukinovec

tests/Bootstrappers/BroadcastingConfigBootstrapperTest.php

@@ -152,6 +152,14 @@
     expect(app(BroadcasterContract::class)->config['key'])->toBe('tenant1_key');
     expect(Broadcast::driver()->config['key'])->toBe('tenant1_key');
 
+    // Ending tenancy after a tenant overrode the credentials reverts the broadcasters back to the central credentials
+    tenancy()->end();
+
+    expect(config("broadcasting.connections.{$driver}.key"))->toBe('central_key');
+    expect(app(BroadcastManager::class)->driver()->config['key'])->toBe('central_key');
+    expect(app(BroadcasterContract::class)->config['key'])->toBe('central_key');
+    expect(Broadcast::driver()->config['key'])->toBe('central_key');
+
     // Initializing tenancy for a tenant without the mapped property keeps the central config value
     tenancy()->initialize(Tenant::create());