Adds a dry-run option

Author: raphaelstolt

src/Commands/InitCommand.php

@@ -75,6 +75,12 @@ protected function configure(): void
             $presetDescription,
             self::DEFAULT_PRESET
         );
+        $this->getDefinition()->addOption(new InputOption(
+            'dry-run',
+            null,
+            InputOption::VALUE_NONE,
+            'Do not write any files. Output the content that would be written'
+        ));
     }
 
     /**
@@ -154,6 +160,12 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
         $lpvFileContent = \implode("\n", $defaultGlobPattern);
 
+        if ($input->getOption('dry-run') === true) {
+            $output->writeln($lpvFileContent);
+
+            return self::SUCCESS;
+        }
+
         $bytesWritten = file_put_contents(
             $defaultLpvFile,
             $lpvFileContent

tests/Commands/InitCommandTest.php

@@ -20,7 +20,7 @@
 class InitCommandTest extends TestCase
 {
     /**
-     * Set up test environment.
+     * Set up a test environment.
      */
     protected function setUp(): void
     {
@@ -32,7 +32,7 @@ protected function setUp(): void
     }
 
     /**
-     * Tear down test environment.
+     * Tear down the test environment.
      *
      * @return void
      */
@@ -43,6 +43,25 @@ protected function tearDown(): void
         }
     }
 
+    #[Test]
+    public function printsContentWithoutWritingAFile(): void
+    {
+        $command = new InitCommand(new Analyser(new Finder(new PhpPreset())));
+        $tester = new CommandTester($command);
+
+        $exitCode = $tester->execute([
+            '--preset' => 'PHP',
+            '--dry-run' => true,
+        ]);
+
+        $this->assertSame(0, $exitCode);
+
+        $display = $tester->getDisplay();
+
+        $this->assertStringContainsString('phpunit*', $display);
+
+        $this->assertFileDoesNotExist($this->temporaryDirectory.DIRECTORY_SEPARATOR.'.lpv');
+    }
     #[Test]
     public function createsExpectedDefaultLpvFile(): void
     {