PHP8 Support

- Added PHP 8 support
- Added Prophecy to PHPUnit tests
- Migrated PHPUnit configuration file
- Added temp PHPUnit file to .gitignore

.gitignore

@@ -1,2 +1,3 @@
 /vendor/
 composer.lock
+.phpunit.result.cache

composer.json

@@ -4,7 +4,7 @@
     "type": "library",
     "license": "MIT",
     "require": {
-        "php": "^7.2.0",
+        "php": "^7.2.0|^8.0.0",
         "psr/log": "^1.1"
     },
     "autoload": {
@@ -18,6 +18,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0|^9.0"
+        "phpunit/phpunit": "^8.0|^9.0",
+        "phpspec/prophecy-phpunit": "^2.0"
     }
 }

phpunit.xml.dist

@@ -1,25 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
 <!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
-         colors="true"
-         bootstrap="vendor/autoload.php"
+        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+        backupGlobals="false"
+        colors="true"
+        bootstrap="vendor/autoload.php"
 >
+    <coverage>
+        <include>
+            <directory>src</directory>
+        </include>
+    </coverage>
     <php>
-        <ini name="error_reporting" value="-1" />
+        <ini name="error_reporting" value="-1"/>
     </php>
-
     <testsuites>
         <testsuite name="Linku Feedback Test Suite">
             <directory>tests</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>src</directory>
-        </whitelist>
-    </filter>
 </phpunit>

tests/ChainedFeedbackTest.php

@@ -6,11 +6,14 @@
 use Linku\Feedback\ChainedFeedback;
 use Linku\Feedback\Feedback;
 use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
 use Prophecy\Prophecy\ObjectProphecy;
 use RuntimeException;
 
 class ChainedFeedbackTest extends TestCase
 {
+    use ProphecyTrait;
+
     /**
      * @var Feedback|ObjectProphecy
      */

tests/LoggerFeedbackTest.php

@@ -5,12 +5,15 @@
 
 use Linku\Feedback\LoggerFeedback;
 use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
 use Prophecy\Prophecy\ObjectProphecy;
 use Psr\Log\LoggerInterface;
 use RuntimeException;
 
 final class LoggerFeedbackTest extends TestCase
 {
+    use ProphecyTrait;
+
     /**
      * @var ObjectProphecy|LoggerInterface
      */