From 226e8ce8fd9fee33e8d8b37dd4d7d9c24483b4f9 Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Wed, 19 Jun 2019 18:55:27 +0200
Subject: [PATCH] add test case for holey array

---
 test/Validation.test.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/test/Validation.test.js b/test/Validation.test.js
index e82f8de54fa..694dcd39b33 100644
--- a/test/Validation.test.js
+++ b/test/Validation.test.js
@@ -404,6 +404,25 @@ describe("Validation", () => {
  - configuration.mode should be one of these:
    \\"development\\" | \\"production\\" | \\"none\\"
    -> Enable production optimizations or development hints."
+`)
+	);
+
+	createTestCase(
+		"holey array",
+		// eslint-disable-next-line no-sparse-arrays
+		[
+			{
+				mode: "production"
+			},
+			,
+			{
+				mode: "development"
+			}
+		],
+		msg =>
+			expect(msg).toMatchInlineSnapshot(`
+"Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
+ - configuration should be an object."
 `)
 	);
 });