diff --git a/tests/Composer/Test/Command/AuditCommandTest.php b/tests/Composer/Test/Command/AuditCommandTest.php
index 1b820b479..53041f33d 100644
--- a/tests/Composer/Test/Command/AuditCommandTest.php
+++ b/tests/Composer/Test/Command/AuditCommandTest.php
@@ -13,6 +13,7 @@
 namespace Composer\Test\Command;
 
 use Composer\Test\TestCase;
+use UnexpectedValueException;
 
 class AuditCommandTest extends TestCase
 {
@@ -24,5 +25,20 @@ class AuditCommandTest extends TestCase
         $appTester->run(['command' => 'audit']);
 
         $appTester->assertCommandIsSuccessful();
+        self::assertEquals('No packages - skipping audit.', trim($appTester->getDisplay(true)));
+    }
+
+    public function testErrorAuditingLockFileWhenItIsMissing(): void
+    {
+        $this->initTempComposer();
+        $this->createInstalledJson([self::getPackage()]);
+
+        $this->expectException(UnexpectedValueException::class);
+        $this->expectExceptionMessage(
+            "Valid composer.json and composer.lock files are required to run this command with --locked"
+        );
+
+        $appTester = $this->getApplicationTester();
+        $appTester->run(['command' => 'audit', '--locked' => true]);
     }
 }