fix: sort direction match usort

README.md

@@ -332,7 +332,7 @@ This means that if two elements have the same key, the one that appeared earlier
 in the input will also appear earlier in the sorted output.
 
 ```php
-$valueObjectFactory = static fn (int $id, int $weight) => new class($id, $weight)
+$valueObjectFactory = static fn (int $id, int $weight): object => new class($id, $weight)
 {
     public function __construct(public readonly int $id, public readonly int $weight) {}
 };

src/SortIterableAggregate.php

@@ -54,7 +54,7 @@ public function __construct(iterable $iterable, private Closure $callback)
              */
             protected function compare($value1, $value2): int
             {
-                return (0 === $return = ($this->callback)($value1[1][1], $value2[1][1], $value1[1][0], $value2[1][0])) ? $value2[0] <=> $value1[0] : $return;
+                return (0 === $return = ($this->callback)($value2[1][1], $value1[1][1], $value2[1][0], $value1[1][0])) ? $value2[0] <=> $value1[0] : $return;
             }
         };
 

tests/unit/SortIterableAggregateTest.php

@@ -22,53 +22,82 @@ final class SortIterableAggregateTest extends TestCase
 {
     public function testDoNothing(): void
     {
-        $input = ['a', 'b', 'c', 'd', 'e', 'f'];
+        $input = range('a', 'f');
 
-        $iterator = (new SortIterableAggregate($input, static fn ($right, $left): int => $left <=> $right));
+        $iterator = (new SortIterableAggregate($input, static fn (string $left, string $right): int => $left <=> $right));
 
-        $expected = [];
+        $actual = array_reduce(
+            iterator_to_array($iterator),
+            static fn (array $carry, string $item): array => [...$carry, $item],
+            []
+        );
 
-        foreach ($iterator as $value) {
-            $expected[] = $value;
-        }
-
-        self::assertSame($expected, $input);
+        self::assertSame($input, $actual);
     }
 
     public function testSimpleSort(): void
     {
         $input = array_combine(range('c', 'a'), range('c', 'a'));
 
-        $iterator = (new SortIterableAggregate($input, static fn ($right, $left): int => $left <=> $right));
+        $iterator = (new SortIterableAggregate($input, static fn (string $left, string $right): int => $left <=> $right));
+
+        $actual = array_reduce(
+            iterator_to_array($iterator),
+            static fn (array $carry, string $item): array => [...$carry, $item],
+            []
+        );
+
+        self::assertSame(range('a', 'c'), $actual);
+    }
+
+    public function testSortingDirectionMatchUsort(): void
+    {
+        $input = [
+            self::createValueObject(id: 1, weight: 2),
+            self::createValueObject(id: 160, weight: 1),
+            self::createValueObject(id: 1600, weight: 3),
+            self::createValueObject(id: 2, weight: 2),
+            self::createValueObject(id: 150, weight: 1),
+            self::createValueObject(id: 1500, weight: 3),
+            self::createValueObject(id: 3, weight: 2),
+        ];
 
-        $expected = [];
+        $sortCallback = static fn (object $a, object $b): int => $a->weight <=> $b->weight;
 
-        foreach ($iterator as $value) {
-            $expected[] = $value;
-        }
+        $actual = array_reduce(
+            iterator_to_array(new SortIterableAggregate($input, $sortCallback)),
+            static fn (array $carry, object $item): array => [...$carry, $item->id],
+            []
+        );
 
-        self::assertSame($expected, range('a', 'c'));
+        usort($input, $sortCallback);
+        $expected = array_map(static fn (object $item): int => $item->id, $input);
+
+        self::assertEquals($expected, $actual);
     }
 
     public function testStableSort(): void
     {
-        $valueObjectFactory = static fn (int $id, int $weight) => new class($id, $weight) {
-            public function __construct(
-                public readonly int $id,
-                public readonly int $weight,
-            ) {}
-        };
-
         $input = [
-            $valueObjectFactory(id: 1, weight: 1),
-            $valueObjectFactory(id: 2, weight: 1),
-            $valueObjectFactory(id: 3, weight: 1),
+            self::createValueObject(id: 1, weight: 1),
+            self::createValueObject(id: 2, weight: 1),
+            self::createValueObject(id: 3, weight: 1),
         ];
 
         $sort = new SortIterableAggregate($input, static fn (object $a, object $b): int => $a->weight <=> $b->weight);
 
-        $expected = [1, 2, 3];
+        $expected = range(1, 3);
 
         self::assertSame($expected, iterator_to_array(new MapIterableAggregate($sort, static fn (object $value): int => $value->id)));
     }
+
+    private static function createValueObject(int $id, int $weight): object
+    {
+        return new class($id, $weight) {
+            public function __construct(
+                public int $id,
+                public int $weight,
+            ) {}
+        };
+    }
 }