commit 78c11a12b038dec532147d6a4e2dd4a13d95ba30
Author: Viktor Smagin <thinlineseverywhere@gmail.com>
Date:   Fri Dec 12 10:38:33 2025 +0400

    Version 1.0.0

diff --git a/.editorconfig b/.editorconfig
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+++ b/.editorconfig
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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.php]
+indent_style = space
+indent_size = 4
+
+[*.yml]
+indent_size = 2
+
+[*.json]
+indent_size = 2
diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+vendor/
+
+.phpunit.cache/
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+Copyright 2025 Viktor S. <thinlineseverywhere@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the “Software”),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,156 @@
+# PHP DTO Library
+
+Simple and lightweight PHP library for representing Data Transfer Objects (DTOs) with property value tracking.
+
+## Features
+
+- Easy to use abstract `Dto` class for creating data transfer objects
+- Property value tracking with `Property` wrapper class
+- Support for creating DTOs from arrays with automatic property name conversion
+- Track whether properties are initialized or not
+- Automatic conversion between kebab-case and camelCase
+- Type-safe with PHP 7.4+ and PHP 8.0+
+
+## Installation
+
+Install the library via Composer:
+
+```bash
+composer require diffhead/php-dto
+```
+
+## Testing
+
+Run the test suite:
+
+```bash
+composer test
+```
+
+## Requirements
+
+- PHP 7.4 or higher
+- `diffhead/php-interfaces` ^1.0
+- `jawira/case-converter` ^3.6
+
+## Quick Start
+
+Create a DTO class by extending the `Dto` abstract class:
+
+```php
+<?php
+
+use Diffhead\PHP\Dto\Dto;
+use Diffhead\PHP\Dto\Property;
+
+/**
+ * Properties inside the Dto class
+ * should be camelCase named and 
+ * protected
+ */
+class UserCreate extends Dto
+{
+    protected Property $firstName;
+    protected Property $lastName;
+    protected Property $email;
+}
+```
+
+## Usage
+
+### Creating a DTO from Array
+
+```php
+/**
+ * But inside the source array you can use
+ * camelCase, pascal_case, kebab-case, etc
+ */
+$data = [
+    'first_name' => 'John',
+    'lastName' => 'Doe',
+    'email' => 'john@example.com'
+];
+
+$user = UserCreate::fromArray($data);
+```
+
+### Accessing Properties
+
+Access properties using magic methods. 
+Each property returns a `Property` object that 
+tracks both the value and whether it exists:
+
+```php
+/**
+ * Get the property object
+ */
+$firstName = $user->firstName;
+
+/**
+ * Check property exists and set
+ */
+if ($firstName->exists()) {
+    echo $firstName->value(); // Output: John
+}
+```
+
+### Working with Property Objects
+
+The `Property` class wraps values and tracks their existence:
+
+```php
+$property = new \Diffhead\PHP\Dto\Property('1', true);
+
+$property->value();    // Returns: '1'
+$property->exists();   // Returns: true
+$property->toInt();    // Returns: 1
+$property->toFloat();  // Returns: 1.0
+$proprety->toBool();   // Returns: true
+$property->toArray();  // Returns: ['1']
+$property->toString(); // Returns: '1'
+
+$property = new \Diffhead\PHP\Dto\Property(null, false);
+
+$property->value();    // Returns: null
+$property->exists();   // Returns: false
+```
+
+### Retrieving Values
+
+Get multiple property values at once:
+
+```php
+/**
+ * Get all properties values
+ * 
+ * output: ['first_name' => 'John', 'lastName' => 'Doe', 'email' => 'john@example.com', 'age' => null]
+ */
+$values = $user->getValues(['first_name', 'lastName', 'email', 'age']);
+
+/**
+ * Get only existing properties values
+ * 
+ * output: ['first-name' => 'John', 'last.name' => 'Doe', 'email' => 'john@example.com']
+ */
+$values = $user->getValues(['first-name', 'last.name', 'email', 'age'], true);
+```
+
+## Property Name Conversion
+
+The library automatically handles 
+class property name conversion:
+
+- **dot.case** (e.g., `first.name`) → **camelCase** (e.g., `firstName`)
+- **kebab-case** (e.g., `first-name`) → **camelCase** (e.g., `firstName`)
+- **snake_case** (e.g., `first_name`) → **camelCase** (e.g., `firstName`)
+
+This makes it easy to work with API responses and 
+form data that might use different naming conventions.
+
+But `Diffhead\PHP\Dto\Dto::getValues` method 
+returns raw array keys as they was been passed.
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.
+
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..f7611d3
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+{
+  "name": "diffhead/php-dto",
+  "description": "",
+  "type": "library",
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+  "version": "1.0.0",
+  "keywords": [
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+  ],
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+    }
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+  },
+  "scripts": {
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+  },
+  "minimum-stability": "stable",
+  "authors": [
+    {
+      "name": "Viktor S.",
+      "email": "thinlineseverywhere@gmail.com"
+    }
+  ]
+}
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+            "support": {
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-14T16:00:52+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
+                "reference": "75e2c2a32f5e0b3aef905b9ed0b179b953b3d7c7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.2-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",
+                "source": "https://github.com/sebastianbergmann/type/tree/3.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-02-03T06:13:03+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "3.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c6c1022351a901512170118436c764e473f6de8c",
+                "reference": "c6c1022351a901512170118436c764e473f6de8c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-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",
+                "source": "https://github.com/sebastianbergmann/version/tree/3.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T06:39:44+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.3.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "b7489ce515e168639d17feec34b8847c326b0b3c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/b7489ce515e168639d17feec34b8847c326b0b3c",
+                "reference": "b7489ce515e168639d17feec34b8847c326b0b3c",
+                "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/1.3.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-11-17T20:03:58+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": {},
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": "^7.4 || ^8.0"
+    },
+    "platform-dev": {},
+    "plugin-api-version": "2.9.0"
+}
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..570d32f
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         executionOrder="depends,defects"
+         beStrictAboutOutputDuringTests="true"
+         failOnRisky="true"
+         failOnWarning="true"
+         testdox="true"
+         colors="true"
+         cacheResult="false">
+    <testsuites>
+        <testsuite name="Unit">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
diff --git a/src/Dto.php b/src/Dto.php
new file mode 100644
index 0000000..350a984
--- /dev/null
+++ b/src/Dto.php
@@ -0,0 +1,101 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Diffhead\PHP\Dto;
+
+use Diffhead\PHP\Interfaces\Object\ArrayInstantiable;
+use Jawira\CaseConverter\Convert;
+use TypeError;
+
+abstract class Dto implements ArrayInstantiable
+{
+    /**
+     * @var array<int,string>
+     */
+    private array $initializedProperties = [];
+
+    public static function fromArray(array $data): static
+    {
+        $dto = new static();
+
+        foreach ($data as $prop => $value) {
+            if (str_contains($prop, '-')) {
+                $prop = str_replace('-', '_', $prop);
+            }
+
+            $propConverter = new Convert($prop);
+            $prop = $propConverter->toCamel();
+
+            if (property_exists($dto, $prop)) {
+                $dto->setProperty($prop, $value);
+            }
+        }
+
+        return $dto;
+    }
+
+    public function __get(string $name): Property
+    {
+        return $this->getProperty($name);
+    }
+
+    /**
+     * @param array<int,string> $properties
+     * @param bool $existingOnly
+     *
+     * @return array<string,mixed>
+     */
+    public function getValues(array $properties, bool $existingOnly = false): array
+    {
+        $values = [];
+
+        foreach ($properties as $property) {
+            if (! is_string($property)) {
+                throw new TypeError(
+                    sprintf('Expected string as prop name. Passed "%s"', $property)
+                );
+            }
+
+            $propertyNotExisting = ! $this->getProperty($property)->exists();
+
+            if ($existingOnly && $propertyNotExisting) {
+                continue;
+            }
+
+            $values[$property] = $this->getProperty($property)->value();
+        }
+
+        return $values;
+    }
+
+    final protected function setProperty(string $propName, mixed $value): void
+    {
+        $this->$propName = new Property($value);
+        $this->setPropertyInitialized($propName);
+    }
+
+    final protected function getProperty(string $name): Property
+    {
+        $nameConvert = new Convert($name);
+
+        $propExists = property_exists($this, $name)
+                   || property_exists($this, $name = $nameConvert->toCamel());
+
+        if ($propExists && $this->isPropertyInitialized($name)) {
+            return $this->$name;
+        }
+
+        return new Property(null, false);
+    }
+
+    private function setPropertyInitialized(string $propName): void
+    {
+        $this->initializedProperties[] = $propName;
+    }
+
+    private function isPropertyInitialized(string $propName): bool
+    {
+        return in_array($propName, $this->initializedProperties);
+    }
+}
diff --git a/src/Property.php b/src/Property.php
new file mode 100644
index 0000000..5cfbba0
--- /dev/null
+++ b/src/Property.php
@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Diffhead\PHP\Dto;
+
+/**
+ * @template ValueType
+ */
+class Property
+{
+    /**
+     * @var ValueType
+     */
+    private $value;
+
+    /**
+     * @var bool
+     */
+    private bool $exists;
+
+    /**
+     * @param ValueType $value
+     * @param bool $exists
+     */
+    public function __construct($value, bool $exists = true)
+    {
+        $this->value = $value;
+        $this->exists = $exists;
+    }
+
+    /**
+     * @return ValueType
+     */
+    public function value()
+    {
+        return $this->value;
+    }
+
+    public function toBool(): bool
+    {
+        return (bool) $this->value;
+    }
+
+    public function toInt(): int
+    {
+        return (int) $this->value;
+    }
+
+    public function toFloat(): float
+    {
+        return (float) $this->value;
+    }
+
+    public function toString(): string
+    {
+        return (string) $this->value;
+    }
+
+    public function toArray(): array
+    {
+        return (array) $this->value;
+    }
+
+    public function exists(): bool
+    {
+        return $this->exists;
+    }
+}
diff --git a/tests/DtoTest.php b/tests/DtoTest.php
new file mode 100644
index 0000000..3379975
--- /dev/null
+++ b/tests/DtoTest.php
@@ -0,0 +1,176 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Diffhead\PHP\Dto\Tests;
+
+use Diffhead\PHP\Dto\Dto;
+use Diffhead\PHP\Dto\Property;
+use PHPUnit\Framework\TestCase;
+
+class DtoTest extends TestCase
+{
+    public function testProperlyInitializes(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'John Doe',
+            'age' => 30,
+        ]);
+
+        $this->assertSame('John Doe', $dto->name->value());
+        $this->assertTrue($dto->name->exists());
+        $this->assertSame(30, $dto->age->value());
+        $this->assertTrue($dto->age->exists());
+        $this->assertNull($dto->homeAddress->value());
+        $this->assertFalse($dto->homeAddress->exists());
+    }
+
+    public function testInitializationFromKebabCase(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'Jane Doe',
+            'age' => 25,
+            'home-address' => '39 Vicar Lane, Sandilands, United Kingdom',
+        ]);
+
+        $this->assertSame('Jane Doe', $dto->name->value());
+        $this->assertTrue($dto->name->exists());
+        $this->assertSame(25, $dto->age->value());
+        $this->assertTrue($dto->age->exists());
+        $this->assertSame('39 Vicar Lane, Sandilands, United Kingdom', $dto->homeAddress->value());
+        $this->assertTrue($dto->homeAddress->exists());
+    }
+
+    public function testInitializationFromPascalCase(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'Alice',
+            'age' => 28,
+            'home_address' => '123 Main St, Anytown, USA',
+        ]);
+
+        $this->assertSame('Alice', $dto->name->value());
+        $this->assertTrue($dto->name->exists());
+        $this->assertSame(28, $dto->age->value());
+        $this->assertTrue($dto->age->exists());
+        $this->assertSame('123 Main St, Anytown, USA', $dto->homeAddress->value());
+        $this->assertTrue($dto->homeAddress->exists());
+    }
+
+    public function testInitializationFromCamelCase(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'Bob',
+            'age' => 35,
+            'homeAddress' => '456 Elm St, Othertown, USA',
+        ]);
+
+        $this->assertSame('Bob', $dto->name->value());
+        $this->assertTrue($dto->name->exists());
+        $this->assertSame(35, $dto->age->value());
+        $this->assertTrue($dto->age->exists());
+        $this->assertSame('456 Elm St, Othertown, USA', $dto->homeAddress->value());
+        $this->assertTrue($dto->homeAddress->exists());
+    }
+
+    public function testGetStrictExistingPropertiesValues(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'Charlie',
+            'age' => 40,
+        ]);
+
+        $values = $dto->getValues(['name', 'age', 'home_address'], true);
+
+        $this->assertArrayHasKey('name', $values);
+        $this->assertSame('Charlie', $values['name']);
+        $this->assertArrayHasKey('age', $values);
+        $this->assertSame(40, $values['age']);
+        $this->assertArrayNotHasKey('home_address', $values);
+    }
+
+    public function testGetNonStrictExistingPropertiesValues(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'Diana',
+        ]);
+
+        $values = $dto->getValues(['name', 'age', 'home_address'], false);
+
+        $this->assertArrayHasKey('name', $values);
+        $this->assertSame('Diana', $values['name']);
+        $this->assertArrayHasKey('age', $values);
+        $this->assertNull($values['age']);
+        $this->assertArrayHasKey('home_address', $values);
+        $this->assertNull($values['home_address']);
+    }
+
+    public function testGetStrictNonExistingPropertiesValues(): void
+    {
+        $dto = DtoExample::fromArray([]);
+
+        $values = $dto->getValues(['name', 'age'], true);
+
+        $this->assertEmpty($values);
+    }
+
+    public function testGetNonStrictNonExistingPropertiesValues(): void
+    {
+        $dto = DtoExample::fromArray([]);
+
+        $values = $dto->getValues(['name', 'age'], false);
+
+        $this->assertArrayHasKey('name', $values);
+        $this->assertNull($values['name']);
+        $this->assertArrayHasKey('age', $values);
+        $this->assertNull($values['age']);
+    }
+
+    public function testGetKebabCasePropertiesValues(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'Eve',
+            'age' => 29,
+            'home-address' => '789 Oak St, Sometown, USA',
+        ]);
+
+        $values = $dto->getValues(['name', 'age', 'home-address'], false);
+
+        $this->assertArrayHasKey('name', $values);
+        $this->assertSame('Eve', $values['name']);
+        $this->assertArrayHasKey('age', $values);
+        $this->assertSame(29, $values['age']);
+        $this->assertArrayHasKey('home-address', $values);
+        $this->assertSame('789 Oak St, Sometown, USA', $values['home-address']);
+    }
+
+    public function testGetCamelCasePropertiesValues(): void
+    {
+        $dto = DtoExample::fromArray([
+            'name' => 'Frank',
+            'age' => 33,
+            'homeAddress' => '101 Pine St, Newcity, USA',
+        ]);
+
+        $values = $dto->getValues(['name', 'age', 'homeAddress'], false);
+
+        $this->assertArrayHasKey('name', $values);
+        $this->assertSame('Frank', $values['name']);
+        $this->assertArrayHasKey('age', $values);
+        $this->assertSame(33, $values['age']);
+        $this->assertArrayHasKey('homeAddress', $values);
+        $this->assertSame('101 Pine St, Newcity, USA', $values['homeAddress']);
+    }
+}
+
+/**
+ * @property \Diffhead\PHP\Dto\Property<string> $name
+ * @property \Diffhead\PHP\Dto\Property<int> $age
+ * @property \Diffhead\PHP\Dto\Property<string> $homeAddress
+ */
+class DtoExample extends Dto
+{
+    protected Property $name;
+    protected Property $age;
+    protected Property $homeAddress;
+}
diff --git a/tests/PropertyTest.php b/tests/PropertyTest.php
new file mode 100644
index 0000000..39c17f4
--- /dev/null
+++ b/tests/PropertyTest.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Diffhead\PHP\Dto\Tests;
+
+use Diffhead\PHP\Dto\Property;
+use PHPUnit\Framework\TestCase;
+
+class PropertyTest extends TestCase
+{
+    public function testProperlyInitializes(): void
+    {
+        $property = new Property(131, true);
+
+        $this->assertSame(131, $property->value());
+        $this->assertTrue($property->exists());
+
+        $property = new Property(null, false);
+
+        $this->assertNull($property->value());
+        $this->assertFalse($property->exists());
+    }
+
+    public function testValueCasting(): void
+    {
+        $property = new Property('1', true);
+
+        $this->assertSame('1', $property->toString());
+        $this->assertSame(1, $property->toInt());
+        $this->assertSame(1.0, $property->toFloat());
+        $this->assertTrue($property->toBool());
+        $this->assertSame(['1'], $property->toArray());
+    }
+}