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+<?php
+
+/**
+ * ThaiTest.php
+ *
+ * @since     2026-04-30
+ * @category  Library
+ * @package   Unicode
+ * @author    Nicola Asuni <info@tecnick.com>
+ * @copyright 2011-2026 Nicola Asuni - Tecnick.com LTD
+ * @license   https://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE)
+ * @link      https://github.com/tecnickcom/tc-lib-unicode
+ *
+ * This file is part of tc-lib-unicode software library.
+ */
+
+namespace Test\Substitution;
+
+use Com\Tecnick\Unicode\Substitution\Thai;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Test\TestUtil;
+
+/**
+ * Thai substitution test
+ *
+ * @since     2026-04-30
+ * @category  Library
+ * @package   Unicode
+ * @author    Nicola Asuni <info@tecnick.com>
+ * @copyright 2011-2026 Nicola Asuni - Tecnick.com LTD
+ * @license   https://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE)
+ * @link      https://github.com/tecnickcom/tc-lib-unicode
+ */
+class ThaiTest extends TestUtil
+{
+    /**
+     * @param array<int, int> $input
+     * @param array<int, int> $expected
+     */
+    #[DataProvider('thaiDataProvider')]
+    public function testGetOrdarr(array $input, array $expected): void
+    {
+        $obj = new Thai($input);
+        $this->assertSame($expected, $obj->getOrdarr());
+    }
+
+    /**
+     * @return array<string, array{0: array<int, int>, 1: array<int, int>}>
+     */
+    public static function thaiDataProvider(): array
+    {
+        return [
+            // Empty input returns empty output
+            'empty' => [
+                [],
+                [],
+            ],
+
+            // Pure ASCII: no Thai codepoints, pass through unchanged
+            'ascii_only' => [
+                [0x41, 0x42, 0x43],
+                [0x41, 0x42, 0x43],
+            ],
+
+            // Thai consonant only (no leading vowel): unchanged
+            // U+0E01 THAI CHARACTER KO KAI
+            'consonant_only' => [
+                [0x0E01],
+                [0x0E01],
+            ],
+
+            // Tone mark only: not a leading vowel, unchanged
+            // U+0E48 THAI CHARACTER MAI EK
+            'tone_mark_only' => [
+                [0x0E48],
+                [0x0E48],
+            ],
+
+            // Single leading vowel at end of array (orphaned): leave unchanged
+            // U+0E40 THAI CHARACTER SARA E
+            'orphaned_leading_vowel_end' => [
+                [0x0E40],
+                [0x0E40],
+            ],
+
+            // Leading vowel followed by a tone mark (not a base consonant):
+            // leave unchanged: U+0E40, U+0E48
+            'leading_vowel_then_tone_mark' => [
+                [0x0E40, 0x0E48],
+                [0x0E40, 0x0E48],
+            ],
+
+            // Leading vowel followed by an ASCII character (not a base
+            // consonant): leave unchanged: U+0E40, 0x41
+            'leading_vowel_then_ascii' => [
+                [0x0E40, 0x41],
+                [0x0E40, 0x41],
+            ],
+
+            // Preposed vowel: stored and displayed before the consonant
+            // U+0E40 (SARA E) + U+0E01 (KO KAI)
+            'sara_e_before_ko_kai' => [
+                [0x0E40, 0x0E01],
+                [0x0E40, 0x0E01],
+            ],
+
+            // U+0E41 (SARA AE) + U+0E02 (KHO KHAI)
+            'sara_ae_before_kho_khai' => [
+                [0x0E41, 0x0E02],
+                [0x0E41, 0x0E02],
+            ],
+
+            // U+0E44 (SARA AI MAIMALAI) + last base consonant U+0E2E
+            'sara_ai_before_ho_nokhuk' => [
+                [0x0E44, 0x0E2E],
+                [0x0E44, 0x0E2E],
+            ],
+
+            // Multiple consecutive preposed vowels before one consonant
+            'two_leading_vowels_then_consonant' => [
+                [0x0E40, 0x0E41, 0x0E01],
+                [0x0E40, 0x0E41, 0x0E01],
+            ],
+
+            // Preposed vowel + consonant + tone mark
+            'vowel_consonant_tone' => [
+                [0x0E40, 0x0E01, 0x0E48],
+                [0x0E40, 0x0E01, 0x0E48],
+            ],
+
+            // Mixed: ASCII + Thai cluster + ASCII
+            'mixed_ascii_thai' => [
+                [0x41, 0x0E40, 0x0E01, 0x0E48, 0x42],
+                [0x41, 0x0E40, 0x0E01, 0x0E48, 0x42],
+            ],
+
+            // Two separate Thai clusters in one array
+            'two_clusters' => [
+                [0x0E40, 0x0E01, 0x0E44, 0x0E2E],
+                [0x0E40, 0x0E01, 0x0E44, 0x0E2E],
+            ],
+
+            // Multiple consecutive leading vowels followed by non-consonant
+            // (both left unchanged)
+            'two_leading_vowels_no_consonant' => [
+                [0x0E40, 0x0E41],
+                [0x0E40, 0x0E41],
+            ],
+        ];
+    }
+
+    public function testNormalizesSparseIndexes(): void
+    {
+        $obj = new Thai([3 => 0x0E40, 7 => 0x0E01]);
+        $this->assertSame([0x0E40, 0x0E01], $obj->getOrdarr());
+    }
+}