feat(utf8-handling): implement UTF-8 sanitization for command outputs and enhance error handling in logs processing

tests/Feature/Utf8HandlingTest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Tests\Feature;
+
+use Tests\TestCase;
+
+class Utf8HandlingTest extends TestCase
+{
+    public function test_sanitize_utf8_text_handles_malformed_utf8()
+    {
+        // Test with valid UTF-8
+        $validUtf8 = 'Hello World! 🚀';
+        $this->assertEquals($validUtf8, sanitize_utf8_text($validUtf8));
+
+        // Test with empty string
+        $this->assertEquals('', sanitize_utf8_text(''));
+
+        // Test with malformed UTF-8 (binary data)
+        $malformedUtf8 = "Hello\x80\x81\x82World";
+        $sanitized = sanitize_utf8_text($malformedUtf8);
+        $this->assertTrue(mb_check_encoding($sanitized, 'UTF-8'));
+
+        // Test that JSON encoding works after sanitization
+        $testArray = ['output' => $sanitized];
+        $this->assertIsString(json_encode($testArray, JSON_THROW_ON_ERROR));
+    }
+
+    public function test_remove_iip_handles_malformed_utf8()
+    {
+        // Test with malformed UTF-8 in command output
+        $malformedOutput = "Processing image\x80\x81file.webp";
+        $cleaned = remove_iip($malformedOutput);
+        $this->assertTrue(mb_check_encoding($cleaned, 'UTF-8'));
+
+        // Test that JSON encoding works after cleaning
+        $this->assertIsString(json_encode(['output' => $cleaned], JSON_THROW_ON_ERROR));
+    }
+}