public function testDropAll()
 {
     // create a flow
     $createLocationFlow = $this->getFlow($this->createLocationFlowName, $this->createLocationFlowInstanceId);
     // save its data
     $this->dataManager->save($createLocationFlow, $this->createLocationFlowData);
     // drop all data
     $this->dataManager->dropAll();
     // ensure all data has been dropped
     $this->assertFalse($this->storage->has(DataManagerInterface::STORAGE_ROOT));
 }
 public function testHas()
 {
     $this->assertFalse($this->storage->has('foo'));
 }
 public function testRemove_empty()
 {
     $this->storage->remove('foo');
     $this->assertFalse($this->storage->has('foo'));
 }