| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  |  * This file is part of graze/data-file | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  |  * Copyright (c) 2016 Nature Delivered Ltd. <https://www.graze.com> | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  |  * For the full copyright and license information, please view the LICENSE | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  |  * file that was distributed with this source code. | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  |  * @license https://github.com/graze/data-file/blob/master/LICENSE.md | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  |  * @link    https://github.com/graze/data-file | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  | namespace Graze\DataFile\Test\Unit\Node; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  | use Graze\DataFile\Format\CsvFormat; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  | use Graze\DataFile\Format\CsvFormatInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  | use Graze\DataFile\Format\FormatAwareInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  | use Graze\DataFile\Format\FormatInterface; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  | use Graze\DataFile\Node\LocalFile; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  | use Graze\DataFile\Test\TestCase; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  | class LocalCsvFileTest extends TestCase | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  | { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  |     public function testCloneWillCloneTheCsvDefinition() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |         $file = (new LocalFile('some/path/here')) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |             ->setFormat(new CsvFormat()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  |         $clone = $file->getClone(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |         static::assertNotSame($file, $clone); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |         $clone->getFormat()->setDelimiter('--'); | 
                            
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                | 34 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |         static::assertNotEquals($file->getFormat()->getDelimiter(), $clone->getFormat()->getDelimiter()); | 
                            
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                | 36 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |     public function testImplementsInterface() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |         $file = (new LocalFile('fake/path')) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |             ->setFormat(new CsvFormat()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |         static::assertInstanceOf(FormatAwareInterface::class, $file); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |         static::assertInstanceOf(FormatInterface::class, $file->getFormat()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |         static::assertInstanceOf(CsvFormatInterface::class, $file->getFormat()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |     public function testFormatTypeIsCsv() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |         $file = (new LocalFile('fake/path')) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |             ->setFormat(new CsvFormat()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |         static::assertEquals('csv', $file->getFormatType()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |     } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 55 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 56 |  |  |  | 
            
                        
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: