public function test_transpose()
 {
     $c = new Collection([['Joe', 'Jack', 'Daniel'], ['Biden', 'Daniels', 'Radcliffe']]);
     $this->assertEquals([['Joe', 'Biden'], ['Jack', 'Daniels'], ['Daniel', 'Radcliffe']], $c->transpose()->all());
     $c = new Collection(['foo' => ['a' => 'Joe', 'b' => 'Jack', 'c' => 'Daniel'], 'bar' => ['c' => 'Biden', 'b' => 'Daniels', 'a' => 'Radcliffe']]);
     $this->assertEquals([['Joe', 'Biden'], ['Jack', 'Daniels'], ['Daniel', 'Radcliffe']], $c->transpose()->all());
     $c = new Collection([['Joe', ['Jack', '4'], 'Daniel'], ['Biden', ['Daniels', '7'], 'Radcliffe']]);
     $this->assertEquals([['Joe', 'Biden'], [['Jack', '4'], ['Daniels', '7']], ['Daniel', 'Radcliffe']], $c->transpose()->all());
 }