Add PHP8.0 Support

Author: FrontEndCoffee

composer.json

@@ -25,13 +25,13 @@
     }
   ],
   "require": {
-    "php": "^7.2",
+    "php": "^7.2|^8.0",
     "illuminate/contracts": "^6.0",
     "symfony/yaml": "^4.1",
     "justinrainbow/json-schema": "^5.2"
   },
   "require-dev": {
-    "phpunit/phpunit": "^6.5",
+    "phpunit/phpunit": "^6.5|^9.0",
     "squizlabs/php_codesniffer": "^3.2"
   },
   "autoload": {

tests/Validator/ValidationSystemTest.php

@@ -15,7 +15,7 @@ class ValidationSystemTest extends TestCase
      */
     private $defaultValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         if (!$this->defaultValidator) {
             $this->defaultValidator = new DocumentValidator();
@@ -24,7 +24,11 @@ protected function setUp()
 
     public function testNonExistingSpecFileCausesLogicException()
     {
-        $this->expectException(LogicException::class);
+        if (preg_match('/^8\./', (string) phpversion())) {
+            $this->expectError();
+        } else {
+            $this->expectException(LogicException::class);
+        }
         $this->expectExceptionMessageRegExp('/The default schema file cannot be found/i');
 
         new class extends DocumentValidator