#18 - Age vo

Author: danitome24

src/PhpValueObject/Person/Age.php

@@ -0,0 +1,71 @@
+<?php
+/**
+ * This software was built by:
+ * Daniel Tomé Fernández <danieltomefer@gmail.com>
+ * GitHub: danitome24
+ */
+
+namespace PhpValueObject\Person;
+
+use PhpValueObject\Person\Exception\InvalidAgeException;
+use PhpValueObject\ValueObject;
+
+final class Age implements ValueObject
+{
+    private const MIN_AGE = 0;
+    private const MAX_AGE = 150;
+
+    /**
+     * @var int
+     */
+    private $age;
+
+    /**
+     * Age constructor.
+     * @param int $age
+     */
+    private function __construct(int $age)
+    {
+        $this->checkIsValidAge($age);
+        $this->age = $age;
+    }
+
+    /**
+     * @param int $age
+     * @return static
+     */
+    public static function from(int $age)
+    {
+        return new static($age);
+    }
+
+    /**
+     * @return int
+     */
+    public function age(): int
+    {
+        return $this->age;
+    }
+
+    /**
+     * @param int $age
+     * @throws \PhpValueObject\Person\Exception\InvalidAgeException
+     */
+    private function checkIsValidAge(int $age)
+    {
+        if ($age < self::MIN_AGE || $age > self::MAX_AGE) {
+            throw new InvalidAgeException('Age ' . $age . ' is invalid');
+        }
+    }
+
+    /**
+     * Compare a value object with another one.
+     *
+     * @param static|ValueObject $valueObjectToCompare
+     * @return bool
+     */
+    public function equals(ValueObject $valueObjectToCompare): bool
+    {
+        return ($this->age() === $valueObjectToCompare->age());
+    }
+}

src/PhpValueObject/Person/Exception/InvalidAgeException.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * This software was built by:
+ * Daniel Tomé Fernández <danieltomefer@gmail.com>
+ * GitHub: danitome24
+ */
+
+namespace PhpValueObject\Person\Exception;
+
+use Throwable;
+
+class InvalidAgeException extends \Exception
+{
+    public function __construct($message = "", $code = 0, Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+}

tests/Person/AgeTest.php

@@ -0,0 +1,45 @@
+<?php
+/**
+ * This software was built by:
+ * Daniel Tomé Fernández <danieltomefer@gmail.com>
+ * GitHub: danitome24
+ */
+
+namespace Person;
+
+use PhpValueObject\Person\Age;
+use PHPUnit\Framework\TestCase;
+use PhpValueObject\Person\Exception\InvalidAgeException;
+
+class AgeTest extends TestCase
+{
+    public function testAgeIsValid()
+    {
+        $this->assertEquals(5, Age::from(5)->age());
+    }
+
+    public function testInvalidAgeExceptionIsThrown()
+    {
+        $this->expectException(InvalidAgeException::class);
+        Age::from(-5);
+    }
+
+    /**
+     * @dataProvider ages
+     * @param Age $age
+     * @param Age $ageToCompare
+     * @param bool $isEquals
+     */
+    public function testEqualsMethod(Age $age, Age $ageToCompare, bool $isEquals)
+    {
+        $this->assertEquals($isEquals, $age->equals($ageToCompare));
+    }
+
+    public function ages()
+    {
+        return [
+            [Age::from(14), Age::from(14), true],
+            [Age::from(12), Age::from(11), false]
+        ];
+    }
+}