1 files changed, 15 insertions, 0 deletions
diff --git a/testing/xpcshell/node-ws/test/buffer-util.test.js b/testing/xpcshell/node-ws/test/buffer-util.test.js
new file mode 100644
index 0000000000..a6b84c94b1
--- /dev/null
+++ b/testing/xpcshell/node-ws/test/buffer-util.test.js
@@ -0,0 +1,15 @@
+'use strict';
+
+const assert = require('assert');
+
+const { concat } = require('../lib/buffer-util');
+
+describe('bufferUtil', () => {
+  describe('concat', () => {
+    it('never returns uninitialized data', () => {
+      const buf = concat([Buffer.from([1, 2]), Buffer.from([3, 4])], 6);
+
+      assert.ok(buf.equals(Buffer.from([1, 2, 3, 4])));
+    });
+  });
+});