From c83ebee29a038da6a9718d2a613e8149e963d416 Mon Sep 17 00:00:00 2001
From: Mithun Sasidharan <mithunsasidharan89@gmail.com>
Date: Wed, 13 Dec 2017 22:40:31 +0530
Subject: [PATCH] test: coverage for emitExperimentalWarning

PR-URL: https://github.com/nodejs/node/pull/17635
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
---
 .../test-util-emit-experimental-warning.js      | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 test/parallel/test-util-emit-experimental-warning.js

diff --git a/test/parallel/test-util-emit-experimental-warning.js b/test/parallel/test-util-emit-experimental-warning.js
new file mode 100644
index 00000000000..1c1759a4283
--- /dev/null
+++ b/test/parallel/test-util-emit-experimental-warning.js
@@ -0,0 +1,17 @@
+'use strict';
+// Flags: --expose-internals
+const common = require('../common');
+const assert = require('assert');
+const { emitExperimentalWarning } = require('internal/util');
+
+// This test ensures that the emitExperimentalWarning in internal/util emits a
+// warning when passed an unsupported feature and that it simply returns
+// when passed the same feature multiple times.
+
+process.on('warning', common.mustCall((warning) => {
+  assert(/is an experimental feature/.test(warning.message));
+}, 2));
+
+emitExperimentalWarning('feature1');
+emitExperimentalWarning('feature1'); // should not warn
+emitExperimentalWarning('feature2');