Upgrade deps

composer.json

@@ -12,14 +12,13 @@
         }
     ],
     "require": {
-        "php": ">=5.6.4",
-        "guzzlehttp/guzzle": "^6.3",
+        "php": ">=7.2",
+        "guzzlehttp/guzzle": "^7.2",
         "illuminate/notifications": "5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*|6.*|7.*|8.*",
         "illuminate/support": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*|6.*|7.*|8.*"
     },
     "require-dev": {
-        "mockery/mockery": "^0.9.5",
-        "phpunit/phpunit": "4.*"
+        "phpunit/phpunit": "^8.5"
     },
     "autoload": {
         "psr-4": {

tests/HubtelMessageTest.php

@@ -2,14 +2,14 @@
 
 namespace NotificationChannels\Hubtel\Test;
 
-use PHPUnit_Framework_TestCase;
+use PHPUnit\Framework\TestCase;
 use NotificationChannels\Hubtel\HubtelMessage;
 
-class HubtelMessageTest extends PHPUnit_Framework_TestCase
+class HubtelMessageTest extends TestCase
 {
     public $message;
 
-    public function setUp()
+    public function setUp():void
     {
         parent::setUp();
         $this->message = new HubtelMessage();
@@ -86,4 +86,4 @@ public function it_can_send_the_message_as_a_flash_message()
         $this->message->flashMessage();
         $this->assertEquals($this->message->flashMessage, 'true');
     }
-}
+}