fix: complete InvesteMoz validation and error corrections

tests/Unit/StructuredDataTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Support\CheckedPattern;
+use App\Support\StructuredData;
+use Illuminate\Support\Collection;
+use PHPUnit\Framework\TestCase;
+use UnexpectedValueException;
+
+class StructuredDataTest extends TestCase
+{
+    public function test_collection_normalisation_preserves_keys_and_object_identity(): void
+    {
+        $row = (object) ['id' => 7];
+        $items = StructuredData::collectionItems(new Collection(['row' => $row]));
+        self::assertSame(['row' => $row], $items);
+        self::assertSame($row, $items['row']);
+        $generator = (static function () use ($row) {
+            yield 'row' => $row;
+        })();
+        self::assertSame(['row' => $row], StructuredData::collectionItems($generator));
+    }
+
+    public function test_invalid_scalar_cannot_be_recovered_as_an_empty_collection(): void
+    {
+        $this->expectException(UnexpectedValueException::class);
+        StructuredData::collectionItems('invalid structured snapshot');
+    }
+
+    public function test_invalid_unicode_fails_without_overwriting_the_source(): void
+    {
+        $source = "original\xFF";
+        try {
+            CheckedPattern::split('/\s+/u', $source);
+            self::fail('Malformed text must not be accepted as an empty result.');
+        } catch (\RuntimeException) {
+            self::assertSame("original\xFF", $source);
+        }
+    }
+}