Pinq\ITraversable::groupJoin PHP Method

    public function groupJoin($values);

 /**
  * @dataProvider assocMixedValues
  */
 public function testCalledWithCorrectValueAndKeyParameters(\Pinq\ITraversable $traversable, array $data)
 {
     $traversable->groupJoin([0 => 0])->on(function ($outer, $inner, $outerKey, $innerKey) use($data) {
         $this->assertSame($data[$outerKey], $outer);
         $this->assertSame($inner, 0);
         $this->assertSame($innerKey, 0);
         return true;
     })->to(function ($outer, \Pinq\ITraversable $group, $outerKey, $groupKey) use($data) {
         $this->assertSame($data[$outerKey], $outer);
         $this->assertSame($group->asArray(), [0 => 0]);
         $this->assertSame($groupKey, 0);
     })->asArray();
     $traversable->groupJoin([0 => 0])->onEquality(function ($outer, $outerKey) use($data) {
         $this->assertSame($data[$outerKey], $outer);
         return 'group Key';
     }, function ($inner, $innerKey) {
         $this->assertSame($inner, 0);
         $this->assertSame($innerKey, 0);
         return 'group Key';
     })->to(function ($outer, \Pinq\ITraversable $group, $outerKey, $groupKey) use($data) {
         $this->assertSame($data[$outerKey], $outer);
         $this->assertSame($group->asArray(), [0 => 0]);
         $this->assertSame($groupKey, 'group Key');
     })->asArray();
 }