Add `InitCommand.php` Interactive test case (#12068)

* Add single test case for interactive `init` command

* Fix spelling + use single quotes

* Fix test expectations

---------

Co-authored-by: Jordi Boggiano <j.boggiano@seld.be>

tests/Composer/Test/Command/InitCommandTest.php

@@ -696,4 +696,43 @@ class InitCommandTest extends TestCase
         $file = new JsonFile($dir . '/composer.json');
         self::assertEquals($expected, $file->read());
     }
+
+    public function testInteractiveRun(): void
+    {
+        $dir = $this->initTempComposer();
+        unlink($dir . '/composer.json');
+        unlink($dir . '/auth.json');
+
+        $appTester = $this->getApplicationTester();
+
+        $appTester->setInputs([
+            'vendor/pkg',                   // Pkg name
+            'my desciption',                // Description
+            'Mr. Test <test@example.org>',  // Author
+            'stable',                       // Minimum stability
+            'library',                      // Type
+            'Custom License',               // License
+            'no',                           // Define dependencies
+            'no',                           // Define dev dependencies
+            'n',                            // Add PSR-4 autoload mapping
+            '',                             // Confirm generation
+        ]);
+
+        $appTester->run(['command' => 'init']);
+
+        self::assertSame(0, $appTester->getStatusCode());
+
+        $expected = [
+            'name' => 'vendor/pkg',
+            'description' => 'my desciption',
+            'type' => 'library',
+            'license' => 'Custom License',
+            'authors' => [['name' => 'Mr. Test', 'email' => 'test@example.org']],
+            'minimum-stability' => 'stable',
+            'require' => [],
+        ];
+
+        $file = new JsonFile($dir . '/composer.json');
+        self::assertEquals($expected, $file->read());
+    }
 }