diff --git a/.idea/laravel-idea.xml b/.idea/laravel-idea.xml
new file mode 100644
index 0000000..bd941a4
--- /dev/null
+++ b/.idea/laravel-idea.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="InertiaPackage">
+    <option name="directoryPaths">
+      <list />
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/patterns.iml b/.idea/patterns.iml
index 7b7ef23..acf0426 100644
--- a/.idea/patterns.iml
+++ b/.idea/patterns.iml
@@ -3,6 +3,7 @@
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" packagePrefix="App\Tests\" />
       <excludeFolder url="file://$MODULE_DIR$/vendor/clue/ndjson-react" />
       <excludeFolder url="file://$MODULE_DIR$/vendor/composer" />
       <excludeFolder url="file://$MODULE_DIR$/vendor/evenement/evenement" />
@@ -36,6 +37,30 @@
       <excludeFolder url="file://$MODULE_DIR$/vendor/symfony/service-contracts" />
       <excludeFolder url="file://$MODULE_DIR$/vendor/symfony/stopwatch" />
       <excludeFolder url="file://$MODULE_DIR$/vendor/symfony/string" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/myclabs/deep-copy" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/nikic/php-parser" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phar-io/manifest" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phar-io/version" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phpunit/php-code-coverage" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phpunit/php-file-iterator" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phpunit/php-invoker" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phpunit/php-text-template" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phpunit/php-timer" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/phpunit/phpunit" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/cli-parser" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/comparator" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/complexity" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/environment" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/exporter" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/global-state" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/lines-of-code" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/object-enumerator" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/object-reflector" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/recursion-context" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/type" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/sebastian/version" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/staabm/side-effects-detector" />
+      <excludeFolder url="file://$MODULE_DIR$/vendor/theseer/tokenizer" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
diff --git a/.idea/php.xml b/.idea/php.xml
index 12760d0..77693e8 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -71,6 +71,30 @@
       <path value="$PROJECT_DIR$/vendor/friendsofphp/php-cs-fixer" />
       <path value="$PROJECT_DIR$/vendor/react/stream" />
       <path value="$PROJECT_DIR$/vendor/fidry/cpu-core-counter" />
+      <path value="$PROJECT_DIR$/vendor/nikic/php-parser" />
+      <path value="$PROJECT_DIR$/vendor/myclabs/deep-copy" />
+      <path value="$PROJECT_DIR$/vendor/phar-io/manifest" />
+      <path value="$PROJECT_DIR$/vendor/phar-io/version" />
+      <path value="$PROJECT_DIR$/vendor/staabm/side-effects-detector" />
+      <path value="$PROJECT_DIR$/vendor/theseer/tokenizer" />
+      <path value="$PROJECT_DIR$/vendor/phpunit/php-code-coverage" />
+      <path value="$PROJECT_DIR$/vendor/phpunit/php-file-iterator" />
+      <path value="$PROJECT_DIR$/vendor/phpunit/php-invoker" />
+      <path value="$PROJECT_DIR$/vendor/phpunit/php-text-template" />
+      <path value="$PROJECT_DIR$/vendor/phpunit/php-timer" />
+      <path value="$PROJECT_DIR$/vendor/phpunit/phpunit" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/global-state" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/complexity" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/recursion-context" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/object-enumerator" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/object-reflector" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/cli-parser" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/lines-of-code" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/type" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/version" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/comparator" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/exporter" />
+      <path value="$PROJECT_DIR$/vendor/sebastian/environment" />
     </include_path>
   </component>
   <component name="PhpProjectSharedConfiguration" php_language_level="8.3" />
@@ -82,6 +106,11 @@
   <component name="PhpStanOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>
+  <component name="PhpUnit">
+    <phpunit_settings>
+      <PhpUnitSettings custom_loader_path="$PROJECT_DIR$/vendor/autoload.php" />
+    </phpunit_settings>
+  </component>
   <component name="Psalm">
     <Psalm_settings>
       <psalm_fixer_by_interpreter asDefaultInterpreter="true" interpreter_id="6adcaaf8-6d8b-41cc-8523-d95f7e166ea1" timeout="60000" />
diff --git a/.idea/phpspec.xml b/.idea/phpspec.xml
new file mode 100644
index 0000000..33107fd
--- /dev/null
+++ b/.idea/phpspec.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="PHPSpec">
+    <suites>
+      <PhpSpecSuiteConfiguration>
+        <option name="myPath" value="$PROJECT_DIR$" />
+      </PhpSpecSuiteConfiguration>
+    </suites>
+  </component>
+</project>
\ No newline at end of file
diff --git a/code/decorator.php b/code/decorator.php
index ae4e1ec..a1d6e78 100644
--- a/code/decorator.php
+++ b/code/decorator.php
@@ -9,4 +9,9 @@
 
 declare(strict_types = 1);
 
-dump('Decorator');
\ No newline at end of file
+use Pattern\Structural\Decorator\{BasicInspection, OilChange, TireRotation};
+
+$service = new TireRotation(new OilChange(new BasicInspection()));
+
+echo $service->getDescription() . ': $';
+echo $service->getCost();
diff --git a/composer.json b/composer.json
index f3b6eaa..59796be 100644
--- a/composer.json
+++ b/composer.json
@@ -5,6 +5,11 @@
       "": "src/"
     }
   },
+  "autoload-dev": {
+    "psr-4": {
+      "App\\Tests\\": "tests/"
+    }
+  },
   "authors": [
     {
       "name": "Yevhen Odynets",
@@ -16,7 +21,8 @@
     "ext-simplexml": "*"
   },
   "require-dev": {
-    "friendsofphp/php-cs-fixer": "^3.76"
+    "friendsofphp/php-cs-fixer": "^3.76",
+    "phpunit/phpunit": "^12.2"
   },
   "scripts": {
     "cs": "php-cs-fixer --config=./.php-cs-fixer.php check -v",
diff --git a/composer.lock b/composer.lock
index 33e17b1..3bbf1de 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "15fcc4c375fa23daddd63652d90fdeab",
+    "content-hash": "5651de22c93c7d4e49074f663acf5f87",
     "packages": [],
     "packages-dev": [
         {
@@ -510,6 +510,681 @@
             ],
             "time": "2025-06-30T14:15:06+00:00"
         },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.13.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "faed855a7b5f4d4637717c2b3863e277116beb36"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/faed855a7b5f4d4637717c2b3863e277116beb36",
+                "reference": "faed855a7b5f4d4637717c2b3863e277116beb36",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3 <3.2.2"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpspec/prophecy": "^1.10",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.13.3"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-07-05T12:25:42+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v5.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "ae59794362fe85e051a58ad36b289443f57be7a9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/ae59794362fe85e051a58ad36b289443f57be7a9",
+                "reference": "ae59794362fe85e051a58ad36b289443f57be7a9",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "ext-json": "*",
+                "ext-tokenizer": "*",
+                "php": ">=7.4"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.5.0"
+            },
+            "time": "2025-05-31T08:24:38+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/54750ef60c58e43759730615a392c31c80e23176",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:33:53+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "12.3.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "ddec29dfc128eba9c204389960f2063f3b7fa170"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/ddec29dfc128eba9c204389960f2063f3b7fa170",
+                "reference": "ddec29dfc128eba9c204389960f2063f3b7fa170",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-xmlwriter": "*",
+                "nikic/php-parser": "^5.4.0",
+                "php": ">=8.3",
+                "phpunit/php-file-iterator": "^6.0",
+                "phpunit/php-text-template": "^5.0",
+                "sebastian/complexity": "^5.0",
+                "sebastian/environment": "^8.0",
+                "sebastian/lines-of-code": "^4.0",
+                "sebastian/version": "^6.0",
+                "theseer/tokenizer": "^1.2.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.1"
+            },
+            "suggest": {
+                "ext-pcov": "PHP extension that provides line coverage",
+                "ext-xdebug": "PHP extension that provides line coverage as well as branch and path coverage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "12.3.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "security": "https://github.com/sebastianbergmann/php-code-coverage/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/12.3.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpunit/php-code-coverage",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-06-18T08:58:13+00:00"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "961bc913d42fe24a257bfff826a5068079ac7782"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/961bc913d42fe24a257bfff826a5068079ac7782",
+                "reference": "961bc913d42fe24a257bfff826a5068079ac7782",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "security": "https://github.com/sebastianbergmann/php-file-iterator/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:58:37+00:00"
+        },
+        {
+            "name": "phpunit/php-invoker",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "12b54e689b07a25a9b41e57736dfab6ec9ae5406"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/12b54e689b07a25a9b41e57736dfab6ec9ae5406",
+                "reference": "12b54e689b07a25a9b41e57736dfab6ec9ae5406",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "ext-pcntl": "*",
+                "phpunit/phpunit": "^12.0"
+            },
+            "suggest": {
+                "ext-pcntl": "*"
+            },
+            "type": "library",
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+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "8.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "https://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "security": "https://github.com/sebastianbergmann/global-state/security/policy",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/8.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:56:59+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "97ffee3bcfb5805568d6af7f0f893678fc076d2f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/97ffee3bcfb5805568d6af7f0f893678fc076d2f",
+                "reference": "97ffee3bcfb5805568d6af7f0f893678fc076d2f",
+                "shasum": ""
+            },
+            "require": {
+                "nikic/php-parser": "^5.0",
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "security": "https://github.com/sebastianbergmann/lines-of-code/security/policy",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/4.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:57:28+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "7.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "1effe8e9b8e068e9ae228e542d5d11b5d16db894"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/1effe8e9b8e068e9ae228e542d5d11b5d16db894",
+                "reference": "1effe8e9b8e068e9ae228e542d5d11b5d16db894",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3",
+                "sebastian/object-reflector": "^5.0",
+                "sebastian/recursion-context": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "security": "https://github.com/sebastianbergmann/object-enumerator/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/7.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:57:48+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "4bfa827c969c98be1e527abd576533293c634f6a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/4bfa827c969c98be1e527abd576533293c634f6a",
+                "reference": "4bfa827c969c98be1e527abd576533293c634f6a",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "security": "https://github.com/sebastianbergmann/object-reflector/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:58:17+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "7.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "c405ae3a63e01b32eb71577f8ec1604e39858a7c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/c405ae3a63e01b32eb71577f8ec1604e39858a7c",
+                "reference": "c405ae3a63e01b32eb71577f8ec1604e39858a7c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "security": "https://github.com/sebastianbergmann/recursion-context/security/policy",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/7.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T05:00:01+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "6.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "1d7cd6e514384c36d7a390347f57c385d4be6069"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/1d7cd6e514384c36d7a390347f57c385d4be6069",
+                "reference": "1d7cd6e514384c36d7a390347f57c385d4be6069",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "security": "https://github.com/sebastianbergmann/type/security/policy",
+                "source": "https://github.com/sebastianbergmann/type/tree/6.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-03-18T13:37:31+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "3e6ccf7657d4f0a59200564b08cead899313b53c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/3e6ccf7657d4f0a59200564b08cead899313b53c",
+                "reference": "3e6ccf7657d4f0a59200564b08cead899313b53c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "security": "https://github.com/sebastianbergmann/version/security/policy",
+                "source": "https://github.com/sebastianbergmann/version/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T05:00:38+00:00"
+        },
+        {
+            "name": "staabm/side-effects-detector",
+            "version": "1.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/staabm/side-effects-detector.git",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/staabm/side-effects-detector/zipball/d8334211a140ce329c13726d4a715adbddd0a163",
+                "reference": "d8334211a140ce329c13726d4a715adbddd0a163",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": "^7.4 || ^8.0"
+            },
+            "require-dev": {
+                "phpstan/extension-installer": "^1.4.3",
+                "phpstan/phpstan": "^1.12.6",
+                "phpunit/phpunit": "^9.6.21",
+                "symfony/var-dumper": "^5.4.43",
+                "tomasvotruba/type-coverage": "1.0.0",
+                "tomasvotruba/unused-public": "1.0.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "lib/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "A static analysis tool to detect side effects in PHP code",
+            "keywords": [
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/staabm/side-effects-detector/issues",
+                "source": "https://github.com/staabm/side-effects-detector/tree/1.0.5"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/staabm",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-10-20T05:08:20+00:00"
+        },
         {
             "name": "symfony/console",
             "version": "v7.3.1",
@@ -2537,6 +4034,56 @@
                 }
             ],
             "time": "2025-04-20T20:19:01+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:36:25+00:00"
         }
     ],
     "aliases": [],
diff --git a/src/Pattern/Behavioral/Observer/User.php b/src/Pattern/Behavioral/Observer/User.php
new file mode 100644
index 0000000..f84ffe2
--- /dev/null
+++ b/src/Pattern/Behavioral/Observer/User.php
@@ -0,0 +1,83 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-06
+ * @time: 13:55
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Behavioral\Observer;
+
+use SplObjectStorage;
+use SplObserver;
+use SplSubject;
+
+class User implements SplSubject
+{
+    /**
+     * @var string
+     */
+    private string $name;
+
+    /**
+     * @var SplObjectStorage
+     */
+    private SplObjectStorage $observers;
+
+    public function __construct()
+    {
+        $this->observers = new SplObjectStorage();
+    }
+
+    /**
+     * Attach an observer
+     */
+    public function attach(SplObserver $observer): void
+    {
+        $this->observers->attach($observer);
+    }
+
+    /**
+     * Detach an observer
+     */
+    public function detach(SplObserver $observer): void
+    {
+        $this->observers->detach($observer);
+    }
+
+    /**
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param  string  $name
+     *
+     * @return void
+     */
+    public function setName(string $name): void
+    {
+        $this->name = $name;
+
+        $this->notify();
+    }
+
+    /**
+     * Notify an observer
+     */
+    public function notify(): void
+    {
+        /** @var SplObserver $observer */
+        foreach ($this->observers as $observer) {
+            var_dump($observer);
+            $observer->update($this);
+        }
+    }
+
+}
diff --git a/src/Pattern/Behavioral/Observer/UserObserver.php b/src/Pattern/Behavioral/Observer/UserObserver.php
new file mode 100644
index 0000000..23b1153
--- /dev/null
+++ b/src/Pattern/Behavioral/Observer/UserObserver.php
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-06
+ * @time: 14:06
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Behavioral\Observer;
+
+use SplObserver;
+use SplSubject;
+
+class UserObserver implements SplObserver
+{
+    private array $namesLog = [];
+
+    public function update(SplSubject $subject): void
+    {
+        /** @var User $subject */
+        $this->namesLog[] = $subject->getName();
+    }
+
+    public function getNamesLog(): array
+    {
+        return $this->namesLog;
+    }
+}
diff --git a/src/Pattern/Structural/Decorator/BasicInspection.php b/src/Pattern/Structural/Decorator/BasicInspection.php
new file mode 100644
index 0000000..7d3fed3
--- /dev/null
+++ b/src/Pattern/Structural/Decorator/BasicInspection.php
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-06
+ * @time: 11:38
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Structural\Decorator;
+
+class BasicInspection implements CarServiceInterface
+{
+    public function getCost(): float
+    {
+        return 25.14;
+    }
+
+    public function getDescription(): string
+    {
+        return 'Basic inspection';
+    }
+}
diff --git a/src/Pattern/Structural/Decorator/BorderDecorator.php b/src/Pattern/Structural/Decorator/BorderDecorator.php
deleted file mode 100644
index b679bf9..0000000
--- a/src/Pattern/Structural/Decorator/BorderDecorator.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-
-/**
- * @package: patterns
- * @author: Yevhen Odynets
- * @date: 2025-07-04
- * @time: 10:42
- */
-
-declare(strict_types = 1);
-
-namespace Pattern\Structural\Decorator;
-
-class BorderDecorator implements ShapeInterface
-{
-    public function __construct(private ShapeInterface $shape) {}
-
-    public function draw(): void
-    {
-        echo '<div style="width: 8rem; height: 8rem; border: .5rem solid orange"></div>';
-    }
-}
\ No newline at end of file
diff --git a/src/Pattern/Structural/Decorator/CarServiceInterface.php b/src/Pattern/Structural/Decorator/CarServiceInterface.php
new file mode 100644
index 0000000..66f8ca0
--- /dev/null
+++ b/src/Pattern/Structural/Decorator/CarServiceInterface.php
@@ -0,0 +1,19 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-06
+ * @time: 11:53
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Structural\Decorator;
+
+interface CarServiceInterface
+{
+    public function getCost(): float;
+
+    public function getDescription(): string;
+}
diff --git a/src/Pattern/Structural/Decorator/Circle.php b/src/Pattern/Structural/Decorator/Circle.php
deleted file mode 100644
index 6bb7562..0000000
--- a/src/Pattern/Structural/Decorator/Circle.php
+++ /dev/null
@@ -1,20 +0,0 @@
-<?php
-
-/**
- * @package: patterns
- * @author: Yevhen Odynets
- * @date: 2025-07-04
- * @time: 10:41
- */
-
-declare(strict_types = 1);
-
-namespace Pattern\Structural\Decorator;
-
-class Circle implements ShapeInterface
-{
-    public function draw(): void
-    {
-        // TODO: Implement draw() method.
-    }
-}
\ No newline at end of file
diff --git a/src/Pattern/Structural/Decorator/EmailDecorator.php b/src/Pattern/Structural/Decorator/EmailDecorator.php
deleted file mode 100644
index 99b2ec3..0000000
--- a/src/Pattern/Structural/Decorator/EmailDecorator.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-
-/**
- * @package: patterns
- * @author: Yevhen Odynets
- * @date: 2025-07-04
- * @time: 10:43
- */
-
-declare(strict_types = 1);
-
-namespace Pattern\Structural\Decorator;
-
-class EmailDecorator implements ShapeInterface
-{
-    public function __construct(private ShapeInterface $shape) {}
-
-    public function draw(): void
-    {
-        // TODO: Implement draw() method.
-    }
-}
\ No newline at end of file
diff --git a/src/Pattern/Structural/Decorator/OilChange.php b/src/Pattern/Structural/Decorator/OilChange.php
new file mode 100644
index 0000000..d05b2f9
--- /dev/null
+++ b/src/Pattern/Structural/Decorator/OilChange.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-06
+ * @time: 12:08
+ */
+
+declare(strict_types = 1);
+
+namespace Pattern\Structural\Decorator;
+
+class OilChange implements CarServiceInterface
+{
+    public function __construct(protected CarServiceInterface $carService) {}
+
+    public function getCost(): float
+    {
+        return 29.89 + $this->carService->getCost();
+    }
+
+    public function getDescription(): string
+    {
+        return $this->carService->getDescription() . ', and oil change';
+    }
+}
diff --git a/src/Pattern/Structural/Decorator/ShapeInterface.php b/src/Pattern/Structural/Decorator/ShapeInterface.php
deleted file mode 100644
index 66cfb98..0000000
--- a/src/Pattern/Structural/Decorator/ShapeInterface.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-/**
- * @package: patterns
- * @author: Yevhen Odynets
- * @date: 2025-07-04
- * @time: 10:38
- */
-
-declare(strict_types = 1);
-
-namespace Pattern\Structural\Decorator;
-
-interface ShapeInterface
-{
-    public function draw(): void;
-}
\ No newline at end of file
diff --git a/src/Pattern/Structural/Decorator/SmileDecorator.php b/src/Pattern/Structural/Decorator/SmileDecorator.php
deleted file mode 100644
index 2e57530..0000000
--- a/src/Pattern/Structural/Decorator/SmileDecorator.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-
-/**
- * @package: patterns
- * @author: Yevhen Odynets
- * @date: 2025-07-04
- * @time: 10:47
- */
-
-declare(strict_types = 1);
-
-namespace Pattern\Structural\Decorator;
-
-class SmileDecorator implements ShapeInterface
-{
-    public function __construct(private ShapeInterface $shape) {}
-
-    public function draw(): void
-    {
-        // TODO: Implement draw() method.
-    }
-}
\ No newline at end of file
diff --git a/src/Pattern/Structural/Decorator/Square.php b/src/Pattern/Structural/Decorator/Square.php
deleted file mode 100644
index 6363022..0000000
--- a/src/Pattern/Structural/Decorator/Square.php
+++ /dev/null
@@ -1,20 +0,0 @@
-<?php
-
-/**
- * @package: patterns
- * @author: Yevhen Odynets
- * @date: 2025-07-04
- * @time: 10:41
- */
-
-declare(strict_types = 1);
-
-namespace Pattern\Structural\Decorator;
-
-class Square implements ShapeInterface
-{
-    public function draw(): void
-    {
-        // TODO: Implement draw() method.
-    }
-}
\ No newline at end of file
diff --git a/src/Pattern/Structural/Decorator/TireRotation.php b/src/Pattern/Structural/Decorator/TireRotation.php
new file mode 100644
index 0000000..544aac3
--- /dev/null
+++ b/src/Pattern/Structural/Decorator/TireRotation.php
@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-06
+ * @time: 12:41
+ */
+
+declare(strict_types = 1);
+namespace Pattern\Structural\Decorator;
+
+class TireRotation implements CarServiceInterface
+{
+    public function __construct(protected CarServiceInterface $carService) {}
+
+    public function getCost(): float
+    {
+        return 25.14 + $this->carService->getCost();
+    }
+
+    public function getDescription(): string
+    {
+        return $this->carService->getDescription() . ', and tire rotation';
+    }
+}
diff --git a/tests/ObserverTest.php b/tests/ObserverTest.php
new file mode 100644
index 0000000..5dfc0ce
--- /dev/null
+++ b/tests/ObserverTest.php
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * @package: patterns
+ * @author: Yevhen Odynets
+ * @date: 2025-07-06
+ * @time: 13:31
+ */
+
+declare(strict_types = 1);
+
+namespace App\Tests;
+
+use Pattern\Behavioral\Observer\User;
+use Pattern\Behavioral\Observer\UserObserver;
+use PHPUnit\Framework\TestCase;
+
+class ObserverTest extends TestCase
+{
+    public function testObserver(): void
+    {
+        $user = new User();
+
+        /** These names will be skipped and not be added to the log of names */
+        $user->setName("Just a name");
+        $user->setName("Some new name");
+
+        $userObserver = new UserObserver();
+        $user->attach($userObserver);
+
+        /** After creating a new instance of UserObserver::class
+         * and attached it to User::class instance,
+         * these names will be added to the log of names */
+        $user->setName("Another new name");
+        $user->setName("Once again new name");
+        $user->setName("Possibly other new name");
+
+        $this->assertEquals(
+            ["Another new name", "Once again new name", "Possibly other new name"],
+            $userObserver->getNamesLog()
+        );
+    }
+}