update phpunit to latest version

.gitignore

@@ -6,3 +6,4 @@ build
 vendor
 composer.lock
 phpunit.xml
+.phpunit.result.cache

composer.json

@@ -23,9 +23,8 @@
       "php": ">=5.6.0"
    },
    "require-dev": {
-      "phpunit/phpunit": "5.7.*",
-      "codeclimate/php-test-reporter": "dev-master",
-      "squizlabs/php_codesniffer": "3.4.2"
+      "phpunit/phpunit": "9.5.*",
+      "squizlabs/php_codesniffer": "3.6.2"
    },
    "autoload": {
       "classmap": ["AltoRouter.php"]

tests/AltoRouterTest.php

@@ -58,19 +58,11 @@ class AltoRouterTest extends PHPUnit\Framework\TestCase
      * Sets up the fixture, for example, opens a network connection.
      * This method is called before a test is executed.
      */
-    protected function setUp()
+    protected function setUp() : void
     {
         $this->router = new AltoRouterDebug;
     }
 
-    /**
-     * Tears down the fixture, for example, closes a network connection.
-     * This method is called after a test is executed.
-     */
-    protected function tearDown()
-    {
-    }
-
     /**
      * @covers AltoRouter::getRoutes
      */
@@ -81,7 +73,7 @@ class AltoRouterTest extends PHPUnit\Framework\TestCase
         $target = static function () {
         };
 
-        $this->assertInternalType('array', $this->router->getRoutes());
+        $this->assertIsArray($this->router->getRoutes());
         // $this->assertIsArray($this->router->getRoutes()); // for phpunit 7.x
         $this->router->map($method, $route, $target);
         $this->assertEquals([[$method, $route, $target, null]], $this->router->getRoutes());
@@ -134,6 +126,7 @@ class AltoRouterTest extends PHPUnit\Framework\TestCase
      */
     public function testAddRoutesThrowsExceptionOnInvalidArgument()
     {
+        $this->expectException(RuntimeException::class);
         $this->router->addRoutes(new stdClass);
     }