Added unit tests for helpers and tests for commands

tests/Feature/Commands/ClearOldSessionCommandTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Tests\Feature\Commands;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Foundation\Testing\WithFaker;
+use Tests\TestCase;
+
+class ClearOldSessionCommandTest extends TestCase
+{
+    use RefreshDatabase;
+
+    /**
+     * A basic feature test example.
+     *
+     * @return void
+     */
+    public function testClearSessionsCommand()
+    {
+        $this->artisan('speedtest:clear-sessions')
+             ->expectsOutput('Invalidated expired sessions')
+             ->assertExitCode(0);
+    }
+}