Apply contribution guidelines to "Lowercase" rule

Co-Authored-By: Henrique Moody <henriquemoody@gmail.com>

docs/Lowercase.md

@@ -2,7 +2,7 @@
 
 - `Lowercase()`
 
-Validates if string characters are lowercase in the input:
+Validates whether the characters in the input are lowercase.
 
 ```php
 v::stringType()->lowercase()->validate('xkcd'); // true

library/Exceptions/LowercaseException.php

@@ -13,8 +13,16 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Exceptions;
 
-class LowercaseException extends ValidationException
+/**
+ * @author Danilo Benevides <danilobenevides01@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Jean Pimentel <jeanfap@gmail.com>
+ */
+final class LowercaseException extends ValidationException
 {
+    /**
+     * {@inheritdoc}
+     */
     public static $defaultTemplates = [
         self::MODE_DEFAULT => [
             self::STANDARD => '{{name}} must be lowercase',

library/Rules/Lowercase.php

@@ -13,10 +13,29 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
-class Lowercase extends AbstractRule
+use function is_string;
+use function mb_detect_encoding;
+use function mb_strtolower;
+
+/**
+ * Validates whether the characters in the input are lowercase.
+ *
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Danilo Benevides <danilobenevides01@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Jean Pimentel <jeanfap@gmail.com>
+ */
+final class Lowercase extends AbstractRule
 {
+    /**
+     * {@inheritdoc}
+     */
     public function validate($input): bool
     {
+        if (!is_string($input)) {
+            return false;
+        }
+
         return $input === mb_strtolower($input, mb_detect_encoding($input));
     }
 }

tests/integration/rules/lowercase.phpt

@@ -0,0 +1,38 @@
+--FILE--
+<?php
+require 'vendor/autoload.php';
+
+use Respect\Validation\Exceptions\LowercaseException;
+use Respect\Validation\Exceptions\NestedValidationException;
+use Respect\Validation\Validator as v;
+
+try {
+    v::lowercase()->check('UPPERCASE');
+} catch (LowercaseException $exception) {
+    echo $exception->getMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::lowercase())->check('lowercase');
+} catch (LowercaseException $exception) {
+    echo $exception->getMessage().PHP_EOL;
+}
+
+try {
+    v::lowercase()->assert('UPPERCASE');
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::lowercase())->assert('lowercase');
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+
+?>
+--EXPECTF--
+"UPPERCASE" must be lowercase
+"lowercase" must not be lowercase
+- "UPPERCASE" must be lowercase
+- "lowercase" must not be lowercase

tests/unit/Rules/LowercaseTest.php

@@ -13,58 +13,57 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
-use PHPUnit\Framework\TestCase;
+use Respect\Validation\Test\RuleTestCase;
+use stdClass;
 
 /**
- * @group  rule
+ * @group rule
+ *
  * @covers \Respect\Validation\Rules\Lowercase
- * @covers \Respect\Validation\Exceptions\LowercaseException
+ *
+ * @author Danilo Benevides <danilobenevides01@gmail.com>
+ * @author Gabriel Caruso <carusogabriel34@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Jean Pimentel <jeanfap@gmail.com>
  */
-class LowercaseTest extends TestCase
+final class LowercaseTest extends RuleTestCase
 {
-    /**
-     * @dataProvider providerForValidLowercase
-     */
-    public function testValidLowercaseShouldReturnTrue($input): void
+    /*
+    * {@inheritdoc}
+    */
+    public function providerForValidInput(): array
     {
-        $lowercase = new Lowercase();
-        self::assertTrue($lowercase->__invoke($input));
-        $lowercase->assert($input);
-        $lowercase->check($input);
-    }
+        $rule = new Lowercase();
 
-    /**
-     * @dataProvider providerForInvalidLowercase
-     * @expectedException \Respect\Validation\Exceptions\LowercaseException
-     */
-    public function testInvalidLowercaseShouldThrowException($input): void
-    {
-        $lowercase = new Lowercase();
-        self::assertFalse($lowercase->__invoke($input));
-        $lowercase->assert($input);
-    }
-
-    public function providerForValidLowercase()
-    {
         return [
-            [''],
-            ['lowercase'],
-            ['lowercase-with-dashes'],
-            ['lowercase with spaces'],
-            ['lowercase with numbers 123'],
-            ['lowercase with specials characters like ã ç ê'],
-            ['with specials characters like # $ % & * +'],
-            ['τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός'],
+            [$rule, ''],
+            [$rule, 'lowercase'],
+            [$rule, 'lowercase-with-dashes'],
+            [$rule, 'lowercase with spaces'],
+            [$rule, 'lowercase with numbers 123'],
+            [$rule, 'lowercase with specials characters like ã ç ê'],
+            [$rule, 'with specials characters like # $ % & * +'],
+            [$rule, 'τάχιστη αλώπηξ βαφής ψημένη γη, δρασκελίζει υπέρ νωθρού κυνός'],
+            [$rule, '42'],
+            [$rule, '!@#$%^'],
         ];
     }
 
-    public function providerForInvalidLowercase()
+    /*
+    * {@inheritdoc}
+    */
+    public function providerForInvalidInput(): array
     {
+        $rule = new Lowercase();
+
         return [
-            ['UPPERCASE'],
-            ['CamelCase'],
-            ['First Character Uppercase'],
-            ['With Numbers 1 2 3'],
+            [$rule, 42],
+            [$rule, []],
+            [$rule, new stdClass()],
+            [$rule, 'UPPERCASE'],
+            [$rule, 'CamelCase'],
+            [$rule, 'First Character Uppercase'],
+            [$rule, 'With Numbers 1 2 3'],
         ];
     }
 }