diff --git a/.travis.yml b/.travis.yml
index 89253d5..15427e1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,10 @@
 language: php
 
 php:
-- 7.3
 - 7.4
 - 8.0
 - 8.1
+- 8.2
 
 cache:
   directories:
diff --git a/Dockerfile b/Dockerfile
index 014ba9c..0819008 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.3-fpm
+FROM php:8.2-fpm
 
 RUN apt-get update && apt-get install -y curl
 
diff --git a/README.md b/README.md
index 7d017a1..b1d0441 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,19 @@ This package is a php wrapper for [mountebank API](http://www.mbtest.org/docs/ap
 
     composer require demyan112rv/mountebank-api-php
 
+## Tests
+
+Before run tests install dependencies, build Docker images and run containers:
+    
+    composer install
+    docker-compose up
+
+Enter the container php container and run tests:
+    
+    docker exec -it mountebank_php bash
+    cd /var/www/mountebank-api-php
+    php vendor/bin/phpunit
+
 ## Usage basics
 
 
diff --git a/composer.json b/composer.json
index 59b208f..51f3d2d 100644
--- a/composer.json
+++ b/composer.json
@@ -20,13 +20,13 @@
     }
   },
   "require": {
-    "php": ">=7.3 <8.2",
+    "php": ">=7.4 <8.3",
     "ext-json": "*",
     "guzzlehttp/guzzle": ">=4.1.4"
   },
   "require-dev": {
     "phpunit/phpunit": ">=7.5.20 <9.0",
     "php-coveralls/php-coveralls": ">=v2.0.0",
-    "phpstan/phpstan": ">=0.11.19 <1.0"
+    "phpstan/phpstan": ">=1.0 <2.0"
   }
 }
diff --git a/composer.lock b/composer.lock
index 68be6d7..9f5d2f9 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,26 +4,26 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d054f84e1ecf3b231dfaa2fdcc0dac4a",
+    "content-hash": "5cfcad8677f298f0b14450b718177639",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "7.4.1",
+            "version": "7.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "ee0a041b1760e6a53d2a39c8c34115adc2af2c79"
+                "reference": "b50a2a1251152e43f6a37f0fa053e730a67d25ba"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/ee0a041b1760e6a53d2a39c8c34115adc2af2c79",
-                "reference": "ee0a041b1760e6a53d2a39c8c34115adc2af2c79",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/b50a2a1251152e43f6a37f0fa053e730a67d25ba",
+                "reference": "b50a2a1251152e43f6a37f0fa053e730a67d25ba",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
                 "guzzlehttp/promises": "^1.5",
-                "guzzlehttp/psr7": "^1.8.3 || ^2.1",
+                "guzzlehttp/psr7": "^1.9 || ^2.4",
                 "php": "^7.2.5 || ^8.0",
                 "psr/http-client": "^1.0",
                 "symfony/deprecation-contracts": "^2.2 || ^3.0"
@@ -32,10 +32,10 @@
                 "psr/http-client-implementation": "1.0"
             },
             "require-dev": {
-                "bamarni/composer-bin-plugin": "^1.4.1",
+                "bamarni/composer-bin-plugin": "^1.8.1",
                 "ext-curl": "*",
                 "php-http/client-integration-tests": "^3.0",
-                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
+                "phpunit/phpunit": "^8.5.29 || ^9.5.23",
                 "psr/log": "^1.1 || ^2.0 || ^3.0"
             },
             "suggest": {
@@ -45,17 +45,21 @@
             },
             "type": "library",
             "extra": {
+                "bamarni-bin": {
+                    "bin-links": true,
+                    "forward-command": false
+                },
                 "branch-alias": {
-                    "dev-master": "7.4-dev"
+                    "dev-master": "7.5-dev"
                 }
             },
             "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\": "src/"
-                },
                 "files": [
                     "src/functions_include.php"
-                ]
+                ],
+                "psr-4": {
+                    "GuzzleHttp\\": "src/"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -112,7 +116,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/guzzle/issues",
-                "source": "https://github.com/guzzle/guzzle/tree/7.4.1"
+                "source": "https://github.com/guzzle/guzzle/tree/7.5.0"
             },
             "funding": [
                 {
@@ -128,20 +132,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-12-06T18:43:05+00:00"
+            "time": "2022-08-28T15:39:27+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "1.5.1",
+            "version": "1.5.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "fe752aedc9fd8fcca3fe7ad05d419d32998a06da"
+                "reference": "b94b2807d85443f9719887892882d0329d1e2598"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/promises/zipball/fe752aedc9fd8fcca3fe7ad05d419d32998a06da",
-                "reference": "fe752aedc9fd8fcca3fe7ad05d419d32998a06da",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/b94b2807d85443f9719887892882d0329d1e2598",
+                "reference": "b94b2807d85443f9719887892882d0329d1e2598",
                 "shasum": ""
             },
             "require": {
@@ -157,12 +161,12 @@
                 }
             },
             "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\Promise\\": "src/"
-                },
                 "files": [
                     "src/functions_include.php"
-                ]
+                ],
+                "psr-4": {
+                    "GuzzleHttp\\Promise\\": "src/"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -196,7 +200,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/promises/issues",
-                "source": "https://github.com/guzzle/promises/tree/1.5.1"
+                "source": "https://github.com/guzzle/promises/tree/1.5.2"
             },
             "funding": [
                 {
@@ -212,20 +216,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-10-22T20:56:57+00:00"
+            "time": "2022-08-28T14:55:35+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "2.1.0",
+            "version": "2.4.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "089edd38f5b8abba6cb01567c2a8aaa47cec4c72"
+                "reference": "67c26b443f348a51926030c83481b85718457d3d"
             },
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-                "reference": "089edd38f5b8abba6cb01567c2a8aaa47cec4c72",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/67c26b443f348a51926030c83481b85718457d3d",
+                "reference": "67c26b443f348a51926030c83481b85718457d3d",
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             },
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@@ -239,17 +243,21 @@
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "bamarni/composer-bin-plugin": "^1.4.1",
+                "bamarni/composer-bin-plugin": "^1.8.1",
                 "http-interop/http-factory-tests": "^0.9",
-                "phpunit/phpunit": "^8.5.8 || ^9.3.10"
+                "phpunit/phpunit": "^8.5.29 || ^9.5.23"
             },
             "suggest": {
                 "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
             },
             "type": "library",
             "extra": {
+                "bamarni-bin": {
+                    "bin-links": true,
+                    "forward-command": false
+                },
                 "branch-alias": {
-                    "dev-master": "2.1-dev"
+                    "dev-master": "2.4-dev"
                 }
             },
             "autoload": {
@@ -311,7 +319,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/psr7/issues",
-                "source": "https://github.com/guzzle/psr7/tree/2.1.0"
+                "source": "https://github.com/guzzle/psr7/tree/2.4.3"
             },
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                 {
@@ -327,7 +335,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-10-06T17:43:30+00:00"
+            "time": "2022-10-26T14:07:24+00:00"
         },
         {
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@@ -535,25 +543,25 @@
         },
         {
             "name": "symfony/deprecation-contracts",
-            "version": "v3.0.0",
+            "version": "v3.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/deprecation-contracts.git",
-                "reference": "c726b64c1ccfe2896cb7df2e1331c357ad1c8ced"
+                "reference": "1ee04c65529dea5d8744774d474e7cbd2f1206d3"
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             "dist": {
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-                "url": "https://api.github.com/repos/symfony/deprecation-contracts/zipball/c726b64c1ccfe2896cb7df2e1331c357ad1c8ced",
-                "reference": "c726b64c1ccfe2896cb7df2e1331c357ad1c8ced",
+                "url": "https://api.github.com/repos/symfony/deprecation-contracts/zipball/1ee04c65529dea5d8744774d474e7cbd2f1206d3",
+                "reference": "1ee04c65529dea5d8744774d474e7cbd2f1206d3",
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             },
             "require": {
-                "php": ">=8.0.2"
+                "php": ">=8.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "3.0-dev"
+                    "dev-main": "3.3-dev"
                 },
                 "thanks": {
                     "name": "symfony/contracts",
@@ -582,7 +590,7 @@
             "description": "A generic function and convention to trigger deprecation notices",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.0.0"
+                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.2.0"
             },
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                 {
@@ -598,35 +606,36 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-11-01T23:48:49+00:00"
+            "time": "2022-11-25T10:21:52+00:00"
         }
     ],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.4.0",
+            "version": "1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b"
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-                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/0a0fa9780f5d4e507415a065172d26a98d02047b",
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b",
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             },
             "require": {
                 "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^8.0",
+                "doctrine/coding-standard": "^9 || ^11",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpbench/phpbench": "^0.13 || 1.0.0-alpha2",
-                "phpstan/phpstan": "^0.12",
-                "phpstan/phpstan-phpunit": "^0.12",
-                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+                "phpbench/phpbench": "^0.16 || ^1",
+                "phpstan/phpstan": "^1.4",
+                "phpstan/phpstan-phpunit": "^1",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+                "vimeo/psalm": "^4.30 || ^5.4"
             },
             "type": "library",
             "autoload": {
@@ -653,7 +662,7 @@
             ],
             "support": {
                 "issues": "https://github.com/doctrine/instantiator/issues",
-                "source": "https://github.com/doctrine/instantiator/tree/1.4.0"
+                "source": "https://github.com/doctrine/instantiator/tree/1.5.0"
             },
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@@ -669,38 +678,42 @@
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-            "time": "2020-11-10T18:47:58+00:00"
+            "time": "2022-12-30T00:15:36+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.10.2",
+            "version": "1.11.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
+                "reference": "14daed4296fae74d9e3201d2c4925d1acb7aa614"
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-                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
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             },
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                 "php": "^7.1 || ^8.0"
             },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+            },
             "require-dev": {
-                "doctrine/collections": "^1.0",
-                "doctrine/common": "^2.6",
-                "phpunit/phpunit": "^7.1"
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
             },
             "type": "library",
             "autoload": {
-                "psr-4": {
-                    "DeepCopy\\": "src/DeepCopy/"
-                },
                 "files": [
                     "src/DeepCopy/deep_copy.php"
-                ]
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
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@@ -716,7 +729,7 @@
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             "support": {
                 "issues": "https://github.com/myclabs/DeepCopy/issues",
-                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.0"
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@@ -724,7 +737,7 @@
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             ],
-            "time": "2020-11-13T09:40:50+00:00"
+            "time": "2022-03-03T13:19:32+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -788,16 +801,16 @@
         },
         {
             "name": "phar-io/version",
-            "version": "3.1.0",
+            "version": "3.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "bae7c545bef187884426f042434e561ab1ddb182"
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
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-                "reference": "bae7c545bef187884426f042434e561ab1ddb182",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
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@@ -833,22 +846,22 @@
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                 "issues": "https://github.com/phar-io/version/issues",
-                "source": "https://github.com/phar-io/version/tree/3.1.0"
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
             },
-            "time": "2021-02-23T14:00:09+00:00"
+            "time": "2022-02-21T01:04:05+00:00"
         },
         {
             "name": "php-coveralls/php-coveralls",
-            "version": "v2.5.2",
+            "version": "v2.5.3",
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                 "url": "https://github.com/php-coveralls/php-coveralls.git",
-                "reference": "007e13afdcdba2cd0efcc5f72c3b7efb356a8bd4"
+                "reference": "9d8243bbf0e053333692857c98fab7cfba0d60a9"
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-                "reference": "007e13afdcdba2cd0efcc5f72c3b7efb356a8bd4",
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@@ -863,7 +876,7 @@
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@@ -916,253 +929,26 @@
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-            "homepage": "http://www.phpdoc.org",
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     "platform": {
-        "php": ">=7.3 <8.2",
+        "php": ">=7.4 <8.3",
         "ext-json": "*"
     },
     "platform-dev": [],
diff --git a/phpstan.neon b/phpstan.neon
index 0915bca..0b6508e 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,5 +1,4 @@
 parameters:
 	level: 8
-	checkMissingIterableValueType: false
 	paths:
 		- src
\ No newline at end of file
diff --git a/src/Formatter.php b/src/Formatter.php
index 4f129fc..3e1d1b4 100644
--- a/src/Formatter.php
+++ b/src/Formatter.php
@@ -13,16 +13,16 @@
  */
 class Formatter
 {
-    /**
-     * @var Imposter
-     */
-    protected $imposter;
+    private Imposter $imposter;
 
     public function __construct(Imposter $imposter)
     {
         $this->imposter = $imposter;
     }
 
+    /**
+     * @return array<string, mixed>
+     */
     public function toArray(): array
     {
         $stubs = [];
@@ -56,6 +56,9 @@ public function toArray(): array
         return $array;
     }
 
+    /**
+     * @return array<string, mixed>
+     */
     private function stubToArray(Stub $stub): array
     {
         $array = [];
@@ -76,6 +79,9 @@ private function stubToArray(Stub $stub): array
         return $array;
     }
 
+    /**
+     * @return array<string, mixed>
+     */
     private function responseToArray(Response $response): array
     {
         $key = $response->getType();
@@ -92,6 +98,9 @@ private function responseToArray(Response $response): array
         return $array;
     }
 
+    /**
+     * @return array<string, mixed>
+     */
     private function predicateToArray(Predicate $predicate): array
     {
         $operator = $predicate->getOperator();
@@ -121,7 +130,7 @@ private function predicateToArray(Predicate $predicate): array
 
     /**
      * @param Behavior $behavior
-     * @return array|int|string|null
+     * @return array<string, mixed>|int|string|null
      */
     private function behaviorConfig(Behavior $behavior)
     {
@@ -143,7 +152,7 @@ private function behaviorConfig(Behavior $behavior)
                 $result = $config->getJs();
                 break;
             case $config instanceof Behavior\Config\ShellTransform:
-                $result = $config->getValues();
+                $result = $config->getValue();
                 break;
             default:
                 throw new \InvalidArgumentException('Unknown behavior config class');
diff --git a/src/Imposter.php b/src/Imposter.php
index 0e06299..cdb33e5 100644
--- a/src/Imposter.php
+++ b/src/Imposter.php
@@ -19,21 +19,18 @@ class Imposter
 
     /**
      * The port to run the imposter on.
-     * @var int
      */
-    protected $port;
+    private int $port;
 
     /**
      * Defines the protocol that the imposter will respond to.
-     * @var string
      */
-    protected $protocol;
+    private string $protocol;
 
     /**
      * Optional. Allows you to provide a descriptive name that will show up in the logs and the imposters UI.
-     * @var string
      */
-    protected $name;
+    private string $name;
 
     /**
      * A set of behaviors used to generate a response for an imposter.
@@ -41,54 +38,47 @@ class Imposter
      * and support different responses.
      * @var Stub[]
      */
-    protected $stubs = [];
+    private array $stubs = [];
 
     /**
      * The SSL server private key
-     * @var string|null
      */
-    protected $key;
+    private ?string $key = null;
 
     /**
      * The SSL server certificate
-     * @var string|null
      */
-    protected $cert;
+    private ?string $cert = null;
 
     /**
      * If true, the server will request a client certificate.
      * Since the goal is simply to virtualize a server requiring mutual auth,
      * invalid certificates will not be rejected.
-     * @var bool
      */
-    protected $mutualAuth = false;
+    private bool $mutualAuth = false;
 
     /**
      * The default response to send if no predicate matches.
-     * @var Response|null
      */
-    protected $defaultResponse;
+    private ?Response $defaultResponse = null;
 
     /**
      * If true, mountebank will allow all CORS preflight requests on the imposter.
-     * @var bool
      */
-    protected $allowCORS = false;
+    private bool $allowCORS = false;
 
     /**
      * If true, mountebank will record requests to enable mock verification
-     * @var bool
      */
-    protected $recordRequests = false;
+    private bool $recordRequests = false;
 
     /**
      * Only use for support mb-graphl (https://github.com/bashj79/mb-graphql)
-     * @var string|null
      */
-    protected $schema = null;
+    private ?string $schema = null;
 
     /**
-     * @return array
+     * @return string[]
      */
     public static function getProtocols(): array
     {
@@ -101,36 +91,22 @@ public static function getProtocols(): array
         ];
     }
 
-    /**
-     * @return int
-     */
     public function getPort(): int
     {
         return $this->port;
     }
 
-    /**
-     * @param int $port
-     * @return Imposter
-     */
     public function setPort(int $port): Imposter
     {
         $this->port = $port;
         return $this;
     }
 
-    /**
-     * @return string
-     */
     public function getProtocol(): string
     {
         return $this->protocol;
     }
 
-    /**
-     * @param string $protocol
-     * @return Imposter
-     */
     public function setProtocol(string $protocol): Imposter
     {
         if (!\in_array($protocol, static::getProtocols())) {
@@ -140,18 +116,11 @@ public function setProtocol(string $protocol): Imposter
         return $this;
     }
 
-    /**
-     * @return string
-     */
     public function getName(): string
     {
         return $this->name;
     }
 
-    /**
-     * @param string $name
-     * @return Imposter
-     */
     public function setName(string $name): Imposter
     {
         $this->name = $name;
@@ -168,7 +137,6 @@ public function getStubs(): array
 
     /**
      * @param Stub[] $stubs
-     * @return Imposter
      */
     public function setStubs(array $stubs): Imposter
     {
@@ -176,136 +144,83 @@ public function setStubs(array $stubs): Imposter
         return $this;
     }
 
-    /**
-     * @param Stub $stub
-     * @return Imposter
-     */
     public function addStub(Stub $stub): Imposter
     {
         $this->stubs[] = $stub;
         return $this;
     }
 
-    /**
-     * @return null|string
-     */
     public function getKey(): ?string
     {
         return $this->key;
     }
 
-    /**
-     * @param null|string $key
-     * @return Imposter
-     */
     public function setKey(?string $key): Imposter
     {
         $this->key = $key;
         return $this;
     }
 
-    /**
-     * @return null|string
-     */
     public function getCert(): ?string
     {
         return $this->cert;
     }
 
-    /**
-     * @param null|string $cert
-     * @return Imposter
-     */
     public function setCert(?string $cert): Imposter
     {
         $this->cert = $cert;
         return $this;
     }
 
-    /**
-     * @return bool
-     */
     public function isMutualAuth(): bool
     {
         return $this->mutualAuth;
     }
 
-    /**
-     * @param bool $mutualAuth
-     * @return Imposter
-     */
     public function setMutualAuth(bool $mutualAuth): Imposter
     {
         $this->mutualAuth = $mutualAuth;
         return $this;
     }
 
-    /**
-     * @return Response
-     */
     public function getDefaultResponse(): ?Response
     {
         return $this->defaultResponse;
     }
 
-    /**
-     * @param Response $defaultResponse
-     * @return Imposter
-     */
     public function setDefaultResponse(Response $defaultResponse): Imposter
     {
         $this->defaultResponse = $defaultResponse;
         return $this;
     }
 
-    /**
-     * @return bool
-     */
     public function isAllowCORS(): bool
     {
         return $this->allowCORS;
     }
 
-    /**
-     * @param bool $allowCORS
-     * @return Imposter
-     */
     public function setAllowCORS(bool $allowCORS): Imposter
     {
         $this->allowCORS = $allowCORS;
         return $this;
     }
 
-    /**
-     * @return bool
-     */
     public function isRecordRequests(): bool
     {
         return $this->recordRequests;
     }
 
-    /**
-     * @param bool $recordRequests
-     * @return Imposter
-     */
     public function setRecordRequests(bool $recordRequests): Imposter
     {
         $this->recordRequests = $recordRequests;
         return $this;
     }
 
-    /**
-     * @return string|null
-     */
     public function getSchema(): ?string
     {
         return $this->schema;
     }
 
-    /**
-     * @param null|string $schema
-     * @return Imposter
-     */
     public function setSchema(?string $schema): Imposter
     {
         $this->schema = $schema;
diff --git a/src/Mountebank.php b/src/Mountebank.php
index b1d50a2..1e452f9 100644
--- a/src/Mountebank.php
+++ b/src/Mountebank.php
@@ -19,85 +19,49 @@ class Mountebank
     const URI_CONFIG = 'config';
     const URI_LOGS = 'logs';
 
-    /**
-     * @var ClientInterface
-     */
-    protected $client;
+    private ClientInterface $client;
 
-    /**
-     * @var string
-     */
-    protected $host = 'http://localhost';
+    private string $host = 'http://localhost';
 
-    /**
-     * @var int
-     */
-    protected $port = 2525;
+    private int $port = 2525;
 
-    /**
-     * Mountebank constructor.
-     * @param ClientInterface $client
-     */
     public function __construct(ClientInterface $client)
     {
         $this->client = $client;
     }
 
-    /**
-     * @return string
-     */
     public function getHost(): string
     {
         return $this->host;
     }
 
-    /**
-     * @param string $host
-     * @return Mountebank
-     */
     public function setHost(string $host): self
     {
         $this->host = $host;
         return $this;
     }
 
-    /**
-     * @return int
-     */
     public function getPort(): int
     {
         return $this->port;
     }
 
-    /**
-     * @param int $port
-     * @return Mountebank
-     */
     public function setPort(int $port): self
     {
         $this->port = $port;
         return $this;
     }
 
-    /**
-     * @return string
-     */
     public function getImpostersUrl(): string
     {
         return $this->host . ':' . $this->port . '/' . static::URI_IMPOSTERS;
     }
 
-    /**
-     * @return string
-     */
     public function getLogsUrl(): string
     {
         return $this->host . ':' . $this->port . '/' . static::URI_LOGS;
     }
 
-    /**
-     * @return string
-     */
     public function getConfigUrl(): string
     {
         return $this->host . ':' . $this->port . '/' . static::URI_CONFIG;
@@ -105,8 +69,6 @@ public function getConfigUrl(): string
 
     /**
      * @codeCoverageIgnore
-     * @param int $port
-     * @return ResponseInterface
      */
     public function getImposter(int $port): ResponseInterface
     {
@@ -115,7 +77,6 @@ public function getImposter(int $port): ResponseInterface
 
     /**
      * @codeCoverageIgnore
-     * @return ResponseInterface
      */
     public function getImposters(): ResponseInterface
     {
@@ -124,8 +85,6 @@ public function getImposters(): ResponseInterface
 
     /**
      * @codeCoverageIgnore
-     * @param Imposter $imposter
-     * @return ResponseInterface
      */
     public function addImposter(Imposter $imposter): ResponseInterface
     {
@@ -141,8 +100,6 @@ public function addImposter(Imposter $imposter): ResponseInterface
 
     /**
      * @codeCoverageIgnore
-     * @param int $port
-     * @return ResponseInterface
      */
     public function removeImposter(int $port): ResponseInterface
     {
@@ -151,7 +108,6 @@ public function removeImposter(int $port): ResponseInterface
 
     /**
      * @codeCoverageIgnore
-     * @return ResponseInterface
      */
     public function removeImposters(): ResponseInterface
     {
@@ -160,7 +116,6 @@ public function removeImposters(): ResponseInterface
 
     /**
      * @codeCoverageIgnore
-     * @return ResponseInterface
      */
     public function getConfig(): ResponseInterface
     {
@@ -169,7 +124,6 @@ public function getConfig(): ResponseInterface
 
     /**
      * @codeCoverageIgnore
-     * @return ResponseInterface
      */
     public function getLogs(): ResponseInterface
     {
diff --git a/src/Predicate.php b/src/Predicate.php
index b860a41..de966f7 100644
--- a/src/Predicate.php
+++ b/src/Predicate.php
@@ -3,6 +3,7 @@
 declare(strict_types=1);
 
 namespace Demyan112rv\MountebankPHP;
+
 use Demyan112rv\MountebankPHP\Predicate\JsonPath;
 use Demyan112rv\MountebankPHP\Predicate\XPath;
 
@@ -26,52 +27,38 @@ class Predicate
     const OPERATOR_AND = 'and';
     const OPERATOR_INJECT = 'inject';
 
-    /**
-     * @var string
-     */
-    protected $operator;
+    private string $operator;
 
     /**
-     * @var array
+     * @var array<string, mixed>
      */
-    protected $config = [];
+    private array $config = [];
 
-    /**
-     * @var string
-     */
-    protected $injectJs;
+    private string $injectJs;
 
     /**
      * Determines if the match is case sensitive or not.
      * This includes keys for objects such as query parameters.
-     * @var bool
      */
-    protected $caseSensitive = false;
+    private bool $caseSensitive = false;
 
     /**
      * Defines a regular expression that is stripped out of the request field before matching.
-     * @var string
      */
-    protected $except = '';
+    private string $except = '';
 
     /**
      * Defines an object containing a selector string and, optionally, an ns object field that defines a namespace map.
      * The predicate's scope is limited to the selected value in the request field.
-     * @var XPath|null
      */
-    protected $xPath;
+    private ?XPath $xPath = null;
 
     /**
      * Defines an object containing a selector string.
      * The predicate's scope is limited to the selected value in the request field.
-     * @var JsonPath|null
      */
-    protected $jsonPath;
+    private ?JsonPath $jsonPath = null;
 
-    /**
-     * Predicate constructor.
-     * @param string|null $operator
-     */
     public function __construct(string $operator = null)
     {
         if ($operator) {
@@ -80,7 +67,7 @@ public function __construct(string $operator = null)
     }
 
     /**
-     * @return array
+     * @return string[]
      */
     public static function getOperators(): array
     {
@@ -99,18 +86,11 @@ public static function getOperators(): array
         ];
     }
 
-    /**
-     * @return string
-     */
     public function getOperator(): string
     {
         return $this->operator;
     }
 
-    /**
-     * @param string $operator
-     * @return Predicate
-     */
     public function setOperator(string $operator): self
     {
         if (!\in_array($operator, static::getOperators())) {
@@ -121,7 +101,7 @@ public function setOperator(string $operator): self
     }
 
     /**
-     * @return array
+     * @return array<string, mixed>
      */
     public function getConfig(): array
     {
@@ -129,8 +109,7 @@ public function getConfig(): array
     }
 
     /**
-     * @param array $config
-     * @return Predicate
+     * @param array<string, mixed> $config
      */
     public function setConfig(array $config): self
     {
@@ -138,90 +117,55 @@ public function setConfig(array $config): self
         return $this;
     }
 
-    /**
-     * @return string
-     */
     public function getInjectJs(): string
     {
         return $this->injectJs;
     }
 
-    /**
-     * @param string $injectJs
-     * @return Predicate
-     */
     public function setInjectJs(string $injectJs): self
     {
         $this->injectJs = $injectJs;
         return $this;
     }
 
-    /**
-     * @return bool
-     */
     public function isCaseSensitive(): bool
     {
         return $this->caseSensitive;
     }
 
-    /**
-     * @param bool $caseSensitive
-     * @return Predicate
-     */
     public function setCaseSensitive(bool $caseSensitive): self
     {
         $this->caseSensitive = $caseSensitive;
         return $this;
     }
 
-    /**
-     * @return string
-     */
     public function getExcept(): string
     {
         return $this->except;
     }
 
-    /**
-     * @param string $except
-     * @return Predicate
-     */
     public function setExcept(string $except): self
     {
         $this->except = $except;
         return $this;
     }
 
-    /**
-     * @return XPath
-     */
     public function getXPath(): ?XPath
     {
         return $this->xPath;
     }
 
-    /**
-     * @param XPath $xPath
-     * @return Predicate
-     */
     public function setXPath(XPath $xPath): self
     {
         $this->xPath = $xPath;
         return $this;
     }
 
-    /**
-     * @return JsonPath
-     */
     public function getJsonPath(): ?JsonPath
     {
         return $this->jsonPath;
     }
 
-    /**
-     * @param JsonPath $jsonPath
-     * @return Predicate
-     */
     public function setJsonPath(JsonPath $jsonPath): self
     {
         $this->jsonPath = $jsonPath;
diff --git a/src/Predicate/JsonPath.php b/src/Predicate/JsonPath.php
index a800250..612ca7b 100644
--- a/src/Predicate/JsonPath.php
+++ b/src/Predicate/JsonPath.php
@@ -14,22 +14,14 @@ class JsonPath
 {
     /**
      * The JSONPath selector
-     * @var string
      */
-    protected $selector;
+    private string $selector;
 
-    /**
-     * @return string
-     */
     public function getSelector(): string
     {
         return $this->selector;
     }
 
-    /**
-     * @param string $selector
-     * @return JsonPath
-     */
     public function setSelector(string $selector): self
     {
         $this->selector = $selector;
diff --git a/src/Predicate/XPath.php b/src/Predicate/XPath.php
index ce6f696..30845ef 100644
--- a/src/Predicate/XPath.php
+++ b/src/Predicate/XPath.php
@@ -16,27 +16,20 @@ class XPath
      * The XPath selector
      * @var string
      */
-    protected $selector;
+    protected string $selector;
 
     /**
      * The XPath namespace map, aliasing a prefix to a URL,
      * which allows you to use the prefix in the selector.
-     * @var array
+     * @var array<string, string>
      */
-    protected $ns;
+    protected array $ns;
 
-    /**
-     * @return string
-     */
     public function getSelector(): string
     {
         return $this->selector;
     }
 
-    /**
-     * @param string $selector
-     * @return XPath
-     */
     public function setSelector(string $selector): self
     {
         $this->selector = $selector;
@@ -44,7 +37,7 @@ public function setSelector(string $selector): self
     }
 
     /**
-     * @return array
+     * @return array<string, string>
      */
     public function getNs(): array
     {
@@ -52,8 +45,7 @@ public function getNs(): array
     }
 
     /**
-     * @param array $ns
-     * @return XPath
+     * @param array<string, string> $ns
      */
     public function setNs(array $ns): self
     {
diff --git a/src/Response.php b/src/Response.php
index 2d09f17..68aeecb 100644
--- a/src/Response.php
+++ b/src/Response.php
@@ -20,27 +20,23 @@ class Response
     /**
      * @var string
      */
-    protected $type;
+    private string $type;
 
     /**
-     * @var array
+     * @var array<string, mixed>
      */
-    protected $config = [];
+    private array $config = [];
 
     /**
      * @var string
      */
-    protected $injectJs;
+    private string $injectJs;
 
     /**
      * @var Behavior[]
      */
-    protected $behaviors = [];
+    private array $behaviors = [];
 
-    /**
-     * Response constructor.
-     * @param string|null $type
-     */
     public function __construct(string $type = null)
     {
         if ($type) {
@@ -49,25 +45,18 @@ public function __construct(string $type = null)
     }
 
     /**
-     * @return array
+     * @return string[]
      */
     public static function getTypes(): array
     {
         return [static::TYPE_IS, static::TYPE_PROXY, static::TYPE_INJECT];
     }
 
-    /**
-     * @return string
-     */
     public function getType(): string
     {
         return $this->type;
     }
 
-    /**
-     * @param string $type
-     * @return Response
-     */
     public function setType(string $type): Response
     {
         if (!\in_array($type, static::getTypes())) {
@@ -78,7 +67,7 @@ public function setType(string $type): Response
     }
 
     /**
-     * @return array
+     * @return array<string, mixed>
      */
     public function getConfig(): array
     {
@@ -86,8 +75,7 @@ public function getConfig(): array
     }
 
     /**
-     * @param array $config
-     * @return Response
+     * @param array<string, mixed> $config
      */
     public function setConfig(array $config): Response
     {
@@ -95,18 +83,11 @@ public function setConfig(array $config): Response
         return $this;
     }
 
-    /**
-     * @return string
-     */
     public function getInjectJs(): string
     {
         return $this->injectJs;
     }
 
-    /**
-     * @param string $injectJs
-     * @return Response
-     */
     public function setInjectJs(string $injectJs): Response
     {
         $this->injectJs = $injectJs;
@@ -123,7 +104,6 @@ public function getBehaviors(): array
 
     /**
      * @param Behavior[] $behaviors
-     * @return Response
      */
     public function setBehaviors(array $behaviors): Response
     {
@@ -131,10 +111,6 @@ public function setBehaviors(array $behaviors): Response
         return $this;
     }
 
-    /**
-     * @param Behavior $behavior
-     * @return Response
-     */
     public function addBehavior(Behavior $behavior): Response
     {
         $this->behaviors[] = $behavior;
diff --git a/src/Response/Behavior.php b/src/Response/Behavior.php
index 81d4a07..2939093 100644
--- a/src/Response/Behavior.php
+++ b/src/Response/Behavior.php
@@ -21,29 +21,19 @@ class Behavior
     const TYPE_DECORATE = 'decorate';
     const TYPE_SHELL_TRANSFORM = 'shellTransform';
 
-    /**
-     * @var string
-     */
-    protected $type;
+    private string $type;
 
-    /**
-     * @var Config
-     */
-    protected $config;
+    private Config $config;
 
-    /**
-     * Behavior constructor.
-     * @param string|null $type
-     */
     public function __construct(string $type = null)
     {
-        if ($type) {
+        if (null !== $type) {
             $this->setType($type);
         }
     }
 
     /**
-     * @return array
+     * @return string[]
      */
     public static function getTypes(): array
     {
@@ -57,18 +47,11 @@ public static function getTypes(): array
         ];
     }
 
-    /**
-     * @return string
-     */
     public function getType(): string
     {
         return $this->type;
     }
 
-    /**
-     * @param string $type
-     * @return Behavior
-     */
     public function setType(string $type): Behavior
     {
         if (!\in_array($type, static::getTypes())) {
@@ -78,18 +61,11 @@ public function setType(string $type): Behavior
         return $this;
     }
 
-    /**
-     * @return Config
-     */
-    public function getConfig()
+    public function getConfig(): Config
     {
         return $this->config;
     }
 
-    /**
-     * @param Config $config
-     * @return Behavior
-     */
     public function setConfig(Config $config): Behavior
     {
         $this->config = $config;
diff --git a/src/Response/Behavior/Config/Copy.php b/src/Response/Behavior/Config/Copy.php
index 1f4555b..946c348 100644
--- a/src/Response/Behavior/Config/Copy.php
+++ b/src/Response/Behavior/Config/Copy.php
@@ -18,12 +18,12 @@ class Copy implements Config
      * A list of objects specifying the request field and response token,
      * as well as a way of selecting the value from the request field
      *
-     * @var array
+     * @var array<string, mixed>
      */
-    protected $values;
+    private array $values;
 
     /**
-     * @return array
+     * @return array<string, mixed>
      */
     public function getValues(): array
     {
@@ -31,8 +31,7 @@ public function getValues(): array
     }
 
     /**
-     * @param array $values
-     * @return Copy
+     * @param array<string, mixed> $values
      */
     public function setValues(array $values): Copy
     {
diff --git a/src/Response/Behavior/Config/Decorate.php b/src/Response/Behavior/Config/Decorate.php
index 77f6e38..7163d72 100644
--- a/src/Response/Behavior/Config/Decorate.php
+++ b/src/Response/Behavior/Config/Decorate.php
@@ -22,20 +22,13 @@ class Decorate implements Config
      * The --allowInjection command line flag must be set to support passing in a JavaScript function
      * @var string
      */
-    protected $js;
+    private string $js;
 
-    /**
-     * @return string
-     */
     public function getJs(): string
     {
         return $this->js;
     }
 
-    /**
-     * @param string $js
-     * @return Decorate
-     */
     public function setJs(string $js): Decorate
     {
         $this->js = $js;
diff --git a/src/Response/Behavior/Config/Lookup.php b/src/Response/Behavior/Config/Lookup.php
index 9fdcdd8..dbc4640 100644
--- a/src/Response/Behavior/Config/Lookup.php
+++ b/src/Response/Behavior/Config/Lookup.php
@@ -18,12 +18,12 @@ class Lookup implements Config
      * A list of objects specifying the key (copied from a request field),
      * the data source, and the response token
      *
-     * @var array
+     * @var array<string, mixed>
      */
-    protected $values;
+    private array $values;
 
     /**
-     * @return array
+     * @return array<string, mixed>
      */
     public function getValues(): array
     {
@@ -31,8 +31,7 @@ public function getValues(): array
     }
 
     /**
-     * @param array $values
-     * @return Lookup
+     * @param array<string, mixed> $values
      */
     public function setValues(array $values): Lookup
     {
diff --git a/src/Response/Behavior/Config/Repeat.php b/src/Response/Behavior/Config/Repeat.php
index 0145013..634dfce 100644
--- a/src/Response/Behavior/Config/Repeat.php
+++ b/src/Response/Behavior/Config/Repeat.php
@@ -16,23 +16,14 @@ class Repeat implements Config
 {
     /**
      * The number of times to repeat this response.
-     *
-     * @var int
      */
-    protected $value;
+    private int $value;
 
-    /**
-     * @return int
-     */
     public function getValue(): int
     {
         return $this->value;
     }
 
-    /**
-     * @param int $value
-     * @return Repeat
-     */
     public function setValue(int $value): Repeat
     {
         $this->value = $value;
diff --git a/src/Response/Behavior/Config/ShellTransform.php b/src/Response/Behavior/Config/ShellTransform.php
index f311aa7..d8e11cf 100644
--- a/src/Response/Behavior/Config/ShellTransform.php
+++ b/src/Response/Behavior/Config/ShellTransform.php
@@ -15,29 +15,22 @@
 class ShellTransform implements Config
 {
     /**
-     * Each array element represents the path of a command line application.
-     * The application should accept the JSON-encoded request and response as arguments
-     * and print out the transformed response to stdout.
+     * Represents the path to a command line application.
+     * The application should retrieve the JSON-encoded request
+     * and response from the environment and print out the transformed response to stdout.
      *
-     * @var array
+     * The --allowInjection command line flag must be set to support this behavior.
      */
-    protected $values;
+    private string $value;
 
-    /**
-     * @return array
-     */
-    public function getValues(): array
+    public function getValue(): string
     {
-        return $this->values;
+        return $this->value;
     }
 
-    /**
-     * @param array $values
-     * @return ShellTransform
-     */
-    public function setValues(array $values): ShellTransform
+    public function setValues(string $value): ShellTransform
     {
-        $this->values = $values;
+        $this->value = $value;
         return $this;
     }
 }
\ No newline at end of file
diff --git a/src/Response/Behavior/Config/Wait.php b/src/Response/Behavior/Config/Wait.php
index 4a65810..74a8900 100644
--- a/src/Response/Behavior/Config/Wait.php
+++ b/src/Response/Behavior/Config/Wait.php
@@ -16,17 +16,15 @@ class Wait implements Config
 {
     /**
      * If a number is passed in, mountebank will wait that number of milliseconds before returning.
-     * @var int|null
      */
-    protected $value;
+    private ?int $value = null;
 
     /**
      * If a string is passed in, it is expected to be a parameterless JavaScript function
      * that returns the number of milliseconds to wait.
      * The --allowInjection command line flag must be set to support passing in a JavaScript function
-     * @var string|null
      */
-    protected $js;
+    private ?string $js = null;
 
     /**
      * @return int
@@ -36,28 +34,17 @@ public function getValue(): ?int
         return $this->value;
     }
 
-    /**
-     * @param int $value
-     * @return Wait
-     */
     public function setValue(int $value): Wait
     {
         $this->value = $value;
         return $this;
     }
 
-    /**
-     * @return string
-     */
     public function getJs(): ?string
     {
         return $this->js;
     }
 
-    /**
-     * @param string $js
-     * @return Wait
-     */
     public function setJs(string $js): Wait
     {
         $this->js = $js;
diff --git a/src/Stub.php b/src/Stub.php
index 61288f2..76f43e0 100644
--- a/src/Stub.php
+++ b/src/Stub.php
@@ -15,12 +15,12 @@ class Stub
     /**
      * @var Response[]
      */
-    protected $responses = [];
+    private array $responses = [];
 
     /**
      * @var Predicate[]
      */
-    protected $predicates = [];
+    private array $predicates = [];
 
     /**
      * @return Response[]
@@ -32,7 +32,6 @@ public function getResponses(): array
 
     /**
      * @param Response[] $responses
-     * @return Stub
      */
     public function setResponses(array $responses): self
     {
@@ -42,7 +41,6 @@ public function setResponses(array $responses): self
 
     /**
      * @param Response $response
-     * @return Stub
      */
     public function addResponse(Response $response): self
     {
@@ -60,7 +58,6 @@ public function getPredicates(): array
 
     /**
      * @param Predicate[] $predicates
-     * @return Stub
      */
     public function setPredicates(array $predicates): self
     {
@@ -70,7 +67,6 @@ public function setPredicates(array $predicates): self
 
     /**
      * @param Predicate $predicate
-     * @return Stub
      */
     public function addPredicate(Predicate $predicate): self
     {
diff --git a/tests/Unit/FormatterTest.php b/tests/Unit/FormatterTest.php
index 62f3ea5..62a5dff 100644
--- a/tests/Unit/FormatterTest.php
+++ b/tests/Unit/FormatterTest.php
@@ -43,7 +43,7 @@ public function testHttps(): void
                 (new Behavior(Behavior::TYPE_DECORATE))->setConfig((new Behavior\Config\Decorate())->setJs('js'))
             )
             ->addBehavior(
-                (new Behavior(Behavior::TYPE_SHELL_TRANSFORM))->setConfig((new Behavior\Config\ShellTransform())->setValues([['foo'], ['bar']]))
+                (new Behavior(Behavior::TYPE_SHELL_TRANSFORM))->setConfig((new Behavior\Config\ShellTransform())->setValues('shell string'))
             );
 
         $predicate = new Predicate(Predicate::OPERATOR_EQUALS);
@@ -110,7 +110,7 @@ public function testHttp(): void
                 (new Behavior(Behavior::TYPE_DECORATE))->setConfig((new Behavior\Config\Decorate())->setJs('js'))
             )
             ->addBehavior(
-                (new Behavior(Behavior::TYPE_SHELL_TRANSFORM))->setConfig((new Behavior\Config\ShellTransform())->setValues([['foo'], ['bar']]))
+                (new Behavior(Behavior::TYPE_SHELL_TRANSFORM))->setConfig((new Behavior\Config\ShellTransform())->setValues('shell string'))
             );
 
         $predicate = new Predicate(Predicate::OPERATOR_EQUALS);
diff --git a/tests/Unit/Response/Behavior/Config/ShellTransformTest.php b/tests/Unit/Response/Behavior/Config/ShellTransformTest.php
index 5320bbc..e197525 100644
--- a/tests/Unit/Response/Behavior/Config/ShellTransformTest.php
+++ b/tests/Unit/Response/Behavior/Config/ShellTransformTest.php
@@ -12,8 +12,8 @@ class ShellTransformTest extends TestCase
     public function testFill(): void
     {
         $config = new ShellTransform();
-        $config->setValues([['foo'], ['bar']]);
-        $this->assertNotEmpty($config->getValues());
-        $this->assertTrue(is_array($config->getValues()));
+        $config->setValues('shell string');
+        $this->assertNotEmpty($config->getValue());
+        $this->assertSame('shell string', $config->getValue());
     }
 }
\ No newline at end of file