isTrue() public method

Evaluate is key 'is true'
public isTrue ( $condition, Blueprint $sourceBlueprint = null ) : boolean
$condition
$sourceBlueprint StackFormation\Blueprint
return boolean
 /**
  * @param string $key
  * @throws \Exception
  * @test
  * @dataProvider invalidConditionProvider
  */
 public function invalidCondition($key)
 {
     $this->setExpectedException('Exception', 'Invalid condition');
     $this->conditionalValueStage->isTrue($key);
 }