[10.x] Fix collection shift less than one item

src/Illuminate/Collections/Collection.php

@@ -7,6 +7,7 @@
 use Illuminate\Contracts\Support\CanBeEscapedWhenCastToString;
 use Illuminate\Support\Traits\EnumeratesValues;
 use Illuminate\Support\Traits\Macroable;
+use InvalidArgumentException;
 use stdClass;
 use Traversable;
 
@@ -1124,17 +1125,23 @@ public function search($value, $strict = false)
      *
      * @param  int  $count
      * @return static<int, TValue>|TValue|null
+     *
+     * @throws \InvalidArgumentException
      */
     public function shift($count = 1)
     {
-        if ($count === 1) {
-            return array_shift($this->items);
+        if ($count < 0) {
+            throw new InvalidArgumentException('Number of shifted items may not be less than zero.');
         }
 
-        if ($this->isEmpty()) {
+        if ($count === 0 || $this->isEmpty()) {
             return new static;
         }
 
+        if ($count === 1) {
+            return array_shift($this->items);
+        }
+
         $results = [];
 
         $collectionCount = $this->count();

tests/Support/SupportCollectionTest.php

@@ -391,6 +391,17 @@ public function testShiftReturnsAndRemovesFirstXItemsInCollection()
         $this->assertSame('baz', $data->first());
 
         $this->assertEquals(new Collection(['foo', 'bar', 'baz']), (new Collection(['foo', 'bar', 'baz']))->shift(6));
+
+        $data = new Collection(['foo', 'bar', 'baz']);
+
+        $this->assertEquals(new Collection([]), $data->shift(0));
+        $this->assertEquals(collect(['foo', 'bar', 'baz']), $data);
+
+        $this->expectException('InvalidArgumentException');
+        (new Collection(['foo', 'bar', 'baz']))->shift(-1);
+
+        $this->expectException('InvalidArgumentException');
+        (new Collection(['foo', 'bar', 'baz']))->shift(-2);
     }
 
     /**