Improvements to test.

tests/CommandBackupTest.php

@@ -0,0 +1,29 @@
+<?php 
+namespace App\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Tester\CommandTester;
+use App\CommandBackup;
+
+class CommandBackupTest extends \PHPUnit\Framework\TestCase
+{
+    public function testExecute()
+    {
+
+        $applicationd = new Application('backup', "1.1.1");
+
+        $applicationd->add(new CommandBackup());
+
+
+        $command = $applicationd->find('backup');
+        $commandTester = new CommandTester($command);
+        $commandTester->execute([]);
+
+        $commandTester->assertCommandIsSuccessful();
+
+        // the output of the command in the console
+        $output = $commandTester->getDisplay();
+        $this->assertStringContainsString('backup', $output);
+    }
+}