Change default tenant model, write more tests, cleanup

src/Database/Concerns/HasDatabase.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Stancl\Tenancy\Database\Concerns;
+
+use Stancl\Tenancy\Contracts\TenantWithDatabase;
+use Stancl\Tenancy\DatabaseConfig;
+
+trait HasDatabase
+{
+    public function database(): DatabaseConfig
+    {
+        /** @var TenantWithDatabase $this */
+
+        return new DatabaseConfig($this);
+    }
+}