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src/Util.php

@@ -37,13 +37,14 @@ public static function normalizeIndex(int $index, int $containerLength, bool $th
      * Check if an array is sequential (indexed from 0 to n-1).
      *
      * @param array<mixed> $source The array to check for sequential indexing.
+     * @param bool $forceCustomImplementation Flag only for tests.
      *
      * @return bool Returns true if the array has sequential indexing, false otherwise.
      */
-    public static function isArraySequential(array $source): bool
+    public static function isArraySequential(array $source, bool $forceCustomImplementation = false): bool
     {
-        if (!function_exists('array_is_list')) {
-            return array_keys($source) === range(0, count($source) - 1);
+        if (!function_exists('array_is_list') || $forceCustomImplementation) {
+            return \count($source) === 0 || array_keys($source) === range(0, count($source) - 1);
         }
         return array_is_list($source);
     }

tests/unit/Utils/IsArraySequentialTest.php

@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Smoren\ArrayView\Tests\Unit\Utils;
+
+use Smoren\ArrayView\Exceptions\IndexError;
+use Smoren\ArrayView\Util;
+
+class IsArraySequentialTest extends \Codeception\Test\Unit
+{
+    /**
+     * @dataProvider dataProviderForIsSequentialTrue
+     */
+    public function testIsSequentialTrue(array $source)
+    {
+        $this->assertTrue(Util::isArraySequential($source));
+        $this->assertTrue(Util::isArraySequential($source, true));
+    }
+
+    /**
+     * @dataProvider dataProviderForIsSequentialFalse
+     */
+    public function testIsSequentialFalse(array $source)
+    {
+        $this->assertFalse(Util::isArraySequential($source));
+        $this->assertFalse(Util::isArraySequential($source, true));
+    }
+
+    public function dataProviderForIsSequentialTrue(): array
+    {
+        return [
+            [[]],
+            [['']],
+            [[null]],
+            [[1]],
+            [['1']],
+            [['test']],
+            [[1, 2, 3]],
+            [[0 => 1, 1 => 2, 2 => 3]],
+            [['0' => 1, 1 => 2, 2 => 3]],
+            [['0' => 1, '1' => 2, '2' => 3]],
+            [[10, '20', 30.5]],
+        ];
+    }
+
+    public function dataProviderForIsSequentialFalse(): array
+    {
+        return [
+            [['a' => 1]],
+            [[1 => 1]],
+            [[0 => 1, 1 => 2, 3 => 3]],
+            [[0 => 1, 1 => 2, 2 => 3, 'test' => 123]],
+            [[1 => 2, 2 => 3]],
+            [[1 => 2, 3 => 3, 'a' => 1000]],
+        ];
+    }
+}