Added more tests and fixed changelog

tests/Unit/Controllers/SpeedtestController/FailTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Tests\Unit\Controllers\SpeedtestController;
+
+use App\Http\Controllers\SpeedtestController;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class FailTest extends TestCase
+{
+    use RefreshDatabase;
+
+    /**
+     * SpeedtestController
+     *
+     * @var SpeedtestController
+     */
+    private $controller;
+
+    public function setUp() : void
+    {
+        parent::setUp();
+
+        $this->controller = new SpeedtestController();
+    }
+
+    public function testFail()
+    {
+        $resp = $this->controller->fail(5)->original;
+
+        $this->assertArrayHasKey('method', $resp);
+        $this->assertArrayHasKey('data', $resp);
+        $this->assertArrayHasKey('days', $resp);
+    }
+
+    public function testFailInvalidInput()
+    {
+        $resp = $this->controller->fail('test')->original;
+
+        $this->assertArrayHasKey('method', $resp);
+        $this->assertArrayHasKey('error', $resp);
+    }
+}