Added unique_values validation rule

Author: freost

CHANGELOG.md

@@ -16,6 +16,7 @@
 	- `ClassFinder::using()`
 	- `ClassFinder::with()`
 * Added `ClassFinder::findWith()` method to to enable finding classes using a certain attribute.
+* Added `unique_values` validation rule.
 
 #### Deprecations
 

src/mako/validator/Validator.php

@@ -80,6 +80,7 @@
 use mako\validator\rules\session\Token;
 use mako\validator\rules\Str;
 use mako\validator\rules\TimeZone;
+use mako\validator\rules\UniqueValues;
 use mako\validator\rules\URL;
 use mako\validator\rules\UUID;
 
@@ -173,6 +174,7 @@ class Validator
 		'string'                   => Str::class,
 		'time_zone'                => TimeZone::class,
 		'token'                    => Token::class,
+		'unique_values'            => UniqueValues::class,
 		'unique'                   => Unique::class,
 		'url'                      => URL::class,
 		'uuid'                     => UUID::class,

src/mako/validator/rules/UniqueValues.php

@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * @copyright Frederic G. Østby
+ * @license   http://www.makoframework.com/license
+ */
+
+namespace mako\validator\rules;
+
+use Override;
+
+use function array_unique;
+use function count;
+use function sprintf;
+
+/**
+ * Unique values rule.
+ */
+class UniqueValues extends Rule implements RuleInterface
+{
+	/**
+	 * I18n parameters.
+	 */
+	protected array $i18nParameters = ['unique'];
+
+	/**
+	 * {@inheritDoc}
+	 */
+	#[Override]
+	public function validate(mixed $value, string $field, array $input): bool
+	{
+		return count($value) === count(array_unique($value));
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	#[Override]
+	public function getErrorMessage(string $field): string
+	{
+		return sprintf('The %s field must only contain unique values.', $field);
+	}
+}

tests/unit/validator/rules/UniqueValuesTest.php

@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * @copyright Frederic G. Østby
+ * @license   http://www.makoframework.com/license
+ */
+
+namespace mako\tests\unit\validator\rules;
+
+use mako\tests\TestCase;
+use mako\validator\rules\UniqueValues;
+use PHPUnit\Framework\Attributes\Group;
+
+#[Group('unit')]
+class UniqueValuesTest extends TestCase
+{
+	/**
+	 *
+	 */
+	public function testValidatesWhenEmpty(): void
+	{
+		$rule = new UniqueValues;
+
+		$this->assertFalse($rule->validateWhenEmpty());
+	}
+
+	/**
+	 *
+	 */
+	public function testWithValidValue(): void
+	{
+		$rule = new UniqueValues;
+
+		$this->assertTrue($rule->validate([], '', []));
+		$this->assertTrue($rule->validate([1, 2, 3], '', []));
+		$this->assertTrue($rule->validate([1, 2, 3, 4], '', []));
+	}
+
+	/**
+	 *
+	 */
+	public function testWithInvalidValue(): void
+	{
+		$rule = new UniqueValues;
+
+		$this->assertFalse($rule->validate([1, 2, 3, 3], '', []));
+
+		$this->assertSame('The foobar field must only contain unique values.', $rule->getErrorMessage('foobar'));
+	}
+}