fix: complete InvesteMoz validation and error corrections

tests/Unit/CheckedFileTest.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Support\CheckedFile;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+use RuntimeException;
+
+class CheckedFileTest extends TestCase
+{
+    public function test_empty_file_is_valid_content_with_a_real_hash_and_zero_size(): void
+    {
+        $path = tempnam(sys_get_temp_dir(), 'investmoz-file-');
+        try {
+            self::assertSame('', CheckedFile::read($path));
+            self::assertSame(hash('sha256', ''), CheckedFile::sha256($path));
+            self::assertSame(0, CheckedFile::size($path));
+        } finally {
+            unlink($path);
+        }
+    }
+
+    public static function operations(): array
+    {
+        return [['read'], ['sha256'], ['size']];
+    }
+
+    public function test_integrity_check_reads_again_after_content_changes(): void
+    {
+        $path = tempnam(sys_get_temp_dir(), 'investmoz-integrity-');
+        try {
+            file_put_contents($path, 'original');
+            $expected = CheckedFile::sha256($path);
+            self::assertTrue(CheckedFile::matches($path, $expected));
+            file_put_contents($path, 'changed');
+            self::assertFalse(CheckedFile::matches($path, $expected));
+        } finally {
+            unlink($path);
+        }
+    }
+
+    #[DataProvider('operations')]
+    public function test_missing_file_cannot_be_converted_to_empty_content_or_a_false_hash(string $operation): void
+    {
+        $this->expectException(RuntimeException::class);
+        CheckedFile::$operation(sys_get_temp_dir().'/investmoz-absent-'.bin2hex(random_bytes(12)));
+    }
+}