Adds a test for UpdateCommand (#11724)

* test: Interactive mode should throw if no package

* PHPStan fix. Missing return type on test method

tests/Composer/Test/Command/UpdateCommandTest.php

@@ -13,6 +13,7 @@
 namespace Composer\Test\Command;
 
 use Composer\Test\TestCase;
+use InvalidArgumentException;
 
 class UpdateCommandTest extends TestCase
 {
@@ -101,4 +102,14 @@ Run `composer require root/req` or `composer require root/req:^2` instead to rep
 OUTPUT
         ];
     }
+
+    public function testInteractiveModeThrowsIfNoPackageEntered(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('You must enter minimum one package.');
+
+        $appTester = $this->getApplicationTester();
+        $appTester->setInputs(['']);
+        $appTester->run(['command' => 'update', '--interactive' => true]);
+    }
 }