| Conditions | 3 | 
| Paths | 4 | 
| Total Lines | 17 | 
| Code Lines | 11 | 
| Lines | 0 | 
| Ratio | 0 % | 
| Changes | 1 | ||
| Bugs | 0 | Features | 0 | 
| 1 | <?php  | 
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| 30 | protected function execute(InputInterface $input, OutputInterface $output)  | 
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| 31 |     { | 
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| 32 | $updater = new Updater(null, false, Updater::STRATEGY_GITHUB);  | 
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| 33 |         $updater->getStrategy()->setPackageName('friendsofphp/pickle'); | 
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| 34 | $updater->getStrategy()->setPharName(self::PHAR_NAME);  | 
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| 35 | $updater->getStrategy()->setCurrentLocalVersion($this->getApplication()->getVersion());  | 
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| 36 | |||
| 37 |         if ($input->getOption('unstable')) { | 
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| 38 |             $updater->getStrategy()->setStability('unstable'); | 
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| 39 | }  | 
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| 40 | |||
| 41 |         if ($updater->update() === false) { | 
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| 42 |             $output->writeln('<info>Already up-to-date.</info>'); | 
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| 43 |         } else { | 
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| 44 |             $output->writeln('<info>' . $updater->getLocalPharFileBasename() . ' has been updated!</info>'); | 
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| 45 | }  | 
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| 46 | }  | 
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| 47 | }  | 
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| 50 | 
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: