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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (c) 2018 Douglas Reith.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please view the LICENSE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * file that was distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Reith\ToyRobot\Infrastructure\Persistence;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PHPUnit\Framework\TestCase;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use org\bovigo\vfs\vfsStream;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use org\bovigo\vfs\vfsStreamDirectory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Reith\ToyRobot\Domain\Space\Table;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Reith\ToyRobot\Domain\Robot\Robot;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class FileRobotStoreTest extends TestCase  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @test  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function canCreateAStore()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $basePath = vfsStream::setup('basePath'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertFalse($basePath->hasChild('robotstore')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $store = FileRobotStore::getStore(vfsStream::url('basePath')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertTrue($basePath->hasChild('robotstore')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $version = '001';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fileName = $version . '-robot.txt';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $robotStorePath = $basePath->getChild('robotstore'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertTrue($robotStorePath->hasChild($fileName));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertInstanceOf(FileRobotStore::class, $store);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @test  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public static function canPersistAndRetrieveARobot()  | 
            
            
                                                        
            
                                    
            
            
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                        self::markTestSkipped('Issue with the vfsStream mock filesystem and SplFileObject'); | 
            
            
                                                        
            
                                    
            
            
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                        $basePath = vfsStream::setup('basePath'); | 
            
                            
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                        $store = FileRobotStore::getStore(vfsStream::url('basePath')); | 
            
            
                                                        
            
                                    
            
            
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                        $robot = Table::create(5)->placeRobot();  | 
            
            
                                                        
            
                                    
            
            
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                        $store->saveRobot($robot);  | 
            
            
                                                        
            
                                    
            
            
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                        $persistedRobot = $store->getRobot();  | 
            
            
                                                        
            
                                    
            
            
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                        self::assertInstanceOf(Robot::class, $persistedRobot);  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.