Inital commit after splitting from project

2026-07-21 22:00:16 +02:00
commit f299f2c60e
49 changed files with 3102 additions and 0 deletions
@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tez\Utils\Tests\Arr;
+
+use PHPUnit\Framework\TestCase;
+use Tez\Utils\Arr\CartesianProduct;
+
+final class CartesianProductTest extends TestCase
+{
+    public function testEmptySetsYieldsOneEmptyTuple(): void
+    {
+        $result = iterator_to_array(CartesianProduct::create(), false);
+
+        self::assertSame([[]], $result);
+    }
+
+    public function testSingleSet(): void
+    {
+        $result = iterator_to_array(CartesianProduct::create([1, 2, 3]), false);
+
+        self::assertSame([[1], [2], [3]], $result);
+    }
+
+    public function testTwoSets(): void
+    {
+        $result = iterator_to_array(CartesianProduct::create([1, 2], ['a', 'b']), false);
+
+        self::assertSame(
+            [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']],
+            $result,
+        );
+    }
+
+    public function testThreeSets(): void
+    {
+        $result = iterator_to_array(
+            CartesianProduct::create(['x', 'y'], [1, 2], ['a', 'b']),
+            false,
+        );
+
+        self::assertCount(8, $result);
+        self::assertSame(['x', 1, 'a'], $result[0]);
+        self::assertSame(['x', 1, 'b'], $result[1]);
+        self::assertSame(['x', 2, 'a'], $result[2]);
+        self::assertSame(['x', 2, 'b'], $result[3]);
+        self::assertSame(['y', 1, 'a'], $result[4]);
+        self::assertSame(['y', 2, 'b'], $result[7]);
+    }
+
+    public function testAssociativeArrayKeysAreStripped(): void
+    {
+        $result = iterator_to_array(
+            CartesianProduct::create(['foo' => 'A', 'bar' => 'B'], ['x' => 1, 'y' => 2]),
+            false,
+        );
+
+        self::assertSame(
+            [['A', 1], ['A', 2], ['B', 1], ['B', 2]],
+            $result,
+        );
+    }
+
+    public function testTotalCountEqualsProductOfSetSizes(): void
+    {
+        $result = iterator_to_array(CartesianProduct::create([1, 2, 3], ['a', 'b'], [true, false]), false);
+
+        self::assertCount(3 * 2 * 2, $result);
+    }
+
+    public function testSingleElementSets(): void
+    {
+        $result = iterator_to_array(CartesianProduct::create(['only'], [42]), false);
+
+        self::assertSame([['only', 42]], $result);
+    }
+
+    public function testGeneratorAsInput(): void
+    {
+        $gen = (static function (): \Generator {
+            yield 10;
+            yield 20;
+        })();
+
+        $result = iterator_to_array(CartesianProduct::create([1, 2], $gen), false);
+
+        self::assertSame([[1, 10], [1, 20], [2, 10], [2, 20]], $result);
+    }
+
+    public function testReturnsGenerator(): void
+    {
+        $generator = CartesianProduct::create([1], [2]);
+
+        self::assertInstanceOf(\Generator::class, $generator);
+    }
+}