public function testRemove()
{
$set = new Text('B-G');
$this->assertSame((string) $set->remove('A-J'), '');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('C-E'), 'B-C,E-G');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('E'), 'B-G');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('-C'), 'C-G');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('B-D'), 'D-G');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('D-'), 'B-D');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('D-'), 'B-D');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('D-G'), 'B-D');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('D-G'), 'B-D');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('B-G'), '');
$set = new Text('B-G');
$this->assertSame((string) $set->remove('-'), '');
}
