getPrefix() final public method

get the prefix for all keys used
final public getPrefix ( ) : string
return string
 /**
  * @test
  */
 public function shouldBeAbleToLoadConfigurationAndTestSomeGettersAndSetters()
 {
     $redis = new Redis();
     $redis->setDatabase(15);
     //clear the redis database for testing
     $redis->flushdb();
     $machine = new StateMachine(new Context(new Identifier(1, 'test-machine'), null, $redis));
     //create the loader
     //get the configuration from the json file
     $configuration = file_get_contents(__DIR__ . '/../loader/fixture-example.json');
     //set it. normally, this would be done by a seperate process that has already loaded the configuration
     $redis->set(Redis::KEY_CONFIGURATION, $configuration);
     //load the machine
     $count = $redis->load($machine);
     $this->assertEquals(4, $count, 'expect 4 transitions to be loaded');
     $this->assertCount(4, $machine->getTransitions(), 'there is a regex transition that adds 2 transitions (a-c and b-c)');
     $this->assertCount(4, $machine->getStates());
     $this->assertNotNull($redis->toString());
     $this->assertNotNull($redis . '');
     $redis->setConfigurationKey("bogus");
     $this->assertEquals("bogus", $redis->getConfigurationKey());
     $redis->setPrefix("foobar");
     $this->assertEquals("foobar", $redis->getPrefix());
 }