Covered untested commands with testing

tests/Commands/UpgradeDatabaseEncodingCommandTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Tests\Commands;
+
+use Tests\TestCase;
+
+class UpgradeDatabaseEncodingCommandTest extends TestCase
+{
+    public function test_command_outputs_sql()
+    {
+        $this->artisan('bookstack:db-utf8mb4')
+            ->expectsOutputToContain('ALTER DATABASE')
+            ->expectsOutputToContain('ALTER TABLE `users` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;');
+    }
+}