diff --git a/test/help/timing_safe_equal.test.js b/test/help/timing_safe_equal.test.js
new file mode 100644
index 00000000..a50affbe
--- /dev/null
+++ b/test/help/timing_safe_equal.test.js
@@ -0,0 +1,12 @@
+const test = require('ava')
+
+const timingSafeEqual = require('../../lib/help/timing_safe_equal')
+
+test('same length buffers', t => {
+  t.is(true, timingSafeEqual(Buffer.from('foo'), Buffer.from('foo')))
+  t.is(false, timingSafeEqual(Buffer.from('foo'), Buffer.from('bar')))
+})
+
+test('different length buffers', t => {
+  t.is(false, timingSafeEqual(Buffer.from('foo'), Buffer.from('barbaz')))
+})