replace prophecy tests with phpunit

Author: dbu

composer.json

@@ -18,8 +18,8 @@
         "symfony/options-resolver": "^2.6 || ^3.0 || ^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
-        "phpspec/phpspec": "^5.1 || ^6.0 || ^7.0",
-        "nyholm/psr7": "^1.6.1"
+        "nyholm/psr7": "^1.6.1",
+        "phpunit/phpunit": "^7.5 || ^8.5 || ^9.6"
     },
     "autoload": {
         "psr-4": {
@@ -28,11 +28,11 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "spec\\Http\\Client\\Common\\Plugin\\": "spec/"
+            "Http\\Client\\Common\\Plugin\\Tests\\": "tests/"
         }
     },
     "scripts": {
-        "test": "vendor/bin/phpspec run",
-        "test-ci": "vendor/bin/phpspec run -c phpspec.ci.yml"
+        "test": "vendor/bin/phpunit",
+        "test-ci": "vendor/bin/phpunit"
     }
 }

phpunit.xml.dist

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         beStrictAboutTestsThatDoNotTestAnything="true"
+         beStrictAboutTodoAnnotatedTests="true">
+    <testsuites>
+        <testsuite name="Cache Plugin Test Suite">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>