clear() public method

Removes all commands from the collection.
public clear ( )
 public function testCount()
 {
     $this->assertCount(0, $this->collection);
     $this->collection->add(new Command(new CommandConfig('ls')));
     $this->assertCount(1, $this->collection);
     $this->collection->add(new Command(new CommandConfig('cd')));
     $this->assertCount(2, $this->collection);
     $this->collection->remove('ls');
     $this->assertCount(1, $this->collection);
     $this->collection->clear();
     $this->assertCount(0, $this->collection);
 }