/**
* Adds the given expression as a filter to this query.
*
* @since 0.3
*
* @param string $expression
* @return self
* @throws InvalidArgumentException
*/
public function filter($expression)
{
$this->graphBuilder->filter($expression);
return $this;
}
public function testFilter_invalidExpression()
{
$graphBuilder = new GraphBuilder(new UsageValidator());
$this->setExpectedException('InvalidArgumentException');
$graphBuilder->filter('FooBar');
}