Issue #2707619 by alexpott: Composer install generates warning

core/tests/Drupal/Tests/ComposerIntegrationTest.php

@@ -77,6 +77,15 @@ public function testComposerJson() {
     }
   }
 
+  /**
+   * Tests composer.lock hash.
+   */
+  public function testComposerLockHash() {
+    $json = file_get_contents($this->root . '/composer.json');
+    $lock = json_decode(file_get_contents($this->root . '/composer.lock'), TRUE);
+    $this->assertSame(md5($json), $lock['hash']);
+  }
+
   /**
    * Tests core's composer.json replace section.
    *