fix notification chanels and more tests (#108)

* fix notification chanels and more tests

* fix code style

tests/Unit/SSHCommands/Database/InstallMariadbCommandTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Tests\Unit\SSHCommands\Database;
+
+use App\SSHCommands\Database\InstallMariadbCommand;
+use Tests\TestCase;
+
+class InstallMariadbCommandTest extends TestCase
+{
+    public function test_generate_command()
+    {
+        $command = new InstallMariadbCommand();
+
+        $expected = <<<EOD
+        wget https://downloads.mariadb.com/MariaDB/mariadb_repo_setup
+
+        chmod +x mariadb_repo_setup
+
+        sudo DEBIAN_FRONTEND=noninteractive ./mariadb_repo_setup \
+           --mariadb-server-version="mariadb-10.3"
+
+        sudo DEBIAN_FRONTEND=noninteractive apt update
+
+        sudo DEBIAN_FRONTEND=noninteractive apt install mariadb-server mariadb-backup -y
+
+        sudo service mysql start
+        EOD;
+
+        $this->assertStringContainsString($expected, $command->content());
+    }
+}