Added laravel framework. Bootstrap absolute minimum. Add testing framework that follows Laravel practices. Write simple feature test to test caching.

tests/CreatesApplication.php

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+<?php
+namespace Tests;
+use Illuminate\Contracts\Console\Kernel;
+trait CreatesApplication
+{
+    /**
+     * Creates the application.
+     *
+     * @return \Illuminate\Foundation\Application
+     */
+    public function createApplication()
+    {
+        $app = require __DIR__.'/../bootstrap/app.php';
+        $app->make(Kernel::class)->bootstrap();
+        return $app;
+    }
+}

tests/Feature/CacheTest.php

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+<?php
+namespace Tests\Feature;
+
+use Illuminate\Support\Facades\Cache;
+use Tests\TestCase;
+
+class CacheTest extends TestCase
+{
+    /**
+     * A basic cache example.
+     *
+     * @return void
+     */
+    public function testCache()
+    {
+        Cache::put('foo', 'bar', 5);
+        $this->assertEquals('bar', (Cache::get('foo')));
+    }
+}

tests/TestCase.php

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+<?php
+namespace Tests;
+use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+
+abstract class TestCase extends BaseTestCase
+{
+    use CreatesApplication;
+}