I have just fixed an error in the method isEmpty and added new test

Author: ssheduardo

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 All Notable changes to `Redsys` will be documented in this file
 
+## Version 1.5.0 (2025-01-16)
+### Added
+- None
+
+### Changed
+- Updated isEmpty method to properly handle non-string values
+
+### Fixed
+- Fixed deprecated warning in isEmpty method when passing null values to trim().
+- Fixed incorrect validation of boolean values in isEmpty method
+
 ## Version 1.4.9 (2025-01-11)
 ### Added
 - None

src/Sermepa/Tpv/Tpv.php

@@ -1076,7 +1076,11 @@ protected function decodeParameters($data)
      */
     protected function isEmpty($value)
     {
-        return '' === trim($value);
+        if ($value === null) {
+            return true;
+        }
+
+        return is_string($value) && '' === trim($value);
     }
 
     /**

tests/TpvTest.php

@@ -2,11 +2,76 @@
 
 namespace Sermepa\Tpv;
 
+use ReflectionClass;
 use PHPUnit\Framework\TestCase as PHPUnitTestCase;
 
 class TpvTest extends PHPUnitTestCase
 {
 
+    private $isEmptyMethod;
+    private $redsys;
+
+    protected function setUp(): void
+    {
+        $this->redsys = new Tpv();
+        $reflection = new ReflectionClass(Tpv::class);
+        $this->isEmptyMethod = $reflection->getMethod('isEmpty');
+        $this->isEmptyMethod->setAccessible(true);
+    }
+
+    /**
+     * Data provider for the isEmpty method
+     *
+     * @return array Array of empty values
+     */
+    public function emptyValuesProvider()
+    {
+        return [
+            'null value' => [null],
+            'empty string' => [''],
+            'whitespace string' => ['   '],
+            'tabs' => ["\t\t"],
+            'newlines' => ["\n\r"],
+        ];
+    }
+
+    /**
+     * @test
+     * @dataProvider emptyValuesProvider
+     */
+    public function isEmpty_should_handle_empty_values($value)
+    {
+        $result = $this->isEmptyMethod->invoke($this->redsys, $value);
+        $this->assertTrue($result);
+    }
+
+    /**
+     * Data provider for the isEmpty method
+     *
+     * @return array Array of empty values
+     */
+    public function nonEmptyValuesProvider()
+    {
+        return [
+            'boolean true' => [true],
+            'boolean false' => [false],
+            'empty array' => [[]],
+            'zero as string' => ['0'],
+            'zero as integer' => [0],
+            'normal string' => ['test'],
+        ];
+    }
+
+    /**
+     * @test
+     * @dataProvider nonEmptyValuesProvider
+     */
+    public function isEmpty_returns_false_for_non_empty_values($value)
+    {
+        $result = $this->isEmptyMethod->invoke($this->redsys, $value);
+        $this->assertFalse($result);
+    }
+
     /** @test */
     public function identifier_by_default_required()
     {
@@ -650,7 +715,6 @@ public function test_should_validate_a_merchant_cof_ini($cofIni)
         $parameters = $redsys->getParameters();
         $this->assertArrayHasKey('DS_MERCHANT_COF_INI', $parameters);
         $this->assertContains($parameters['DS_MERCHANT_COF_INI'], [$cofIni]);
-
     }
 
     public function invalidSetMerchantCofIni()