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diff --git a/devtools/client/animationinspector/test/unit/test_findOptimalTimeInterval.js b/devtools/client/animationinspector/test/unit/test_findOptimalTimeInterval.js
new file mode 100644
index 000000000..64451bfdf
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+++ b/devtools/client/animationinspector/test/unit/test_findOptimalTimeInterval.js
@@ -0,0 +1,81 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint no-eval:0 */
+
+"use strict";
+
+var Cu = Components.utils;
+const {require} = Cu.import("resource://devtools/shared/Loader.jsm", {});
+const {findOptimalTimeInterval} = require("devtools/client/animationinspector/utils");
+
+// This test array contains objects that are used to test the
+// findOptimalTimeInterval function. Each object should have the following
+// properties:
+// - desc: an optional string that will be printed out
+// - minTimeInterval: a number that represents the minimum time in ms
+//   that should be displayed in one interval
+// - expectedInterval: a number that you expect the findOptimalTimeInterval
+//   function to return as a result.
+//   Optionally you can pass a string where `interval` is the calculated
+//   interval, this string will be eval'd and tested to be truthy.
+const TEST_DATA = [{
+  desc: "With no minTimeInterval, expect the interval to be 0",
+  minTimeInterval: null,
+  expectedInterval: 0
+}, {
+  desc: "With a minTimeInterval of 0 ms, expect the interval to be 0",
+  minTimeInterval: 0,
+  expectedInterval: 0
+}, {
+  desc: "With a minInterval of 1ms, expect the interval to be the 1ms too",
+  minTimeInterval: 1,
+  expectedInterval: 1
+}, {
+  desc: "With a very small minTimeInterval, expect the interval to be 1ms",
+  minTimeInterval: 1e-31,
+  expectedInterval: 1
+}, {
+  desc: "With a minInterval of 2.5ms, expect the interval to be 2.5ms too",
+  minTimeInterval: 2.5,
+  expectedInterval: 2.5
+}, {
+  desc: "With a minInterval of 5ms, expect the interval to be 5ms too",
+  minTimeInterval: 5,
+  expectedInterval: 5
+}, {
+  desc: "With a minInterval of 7ms, expect the interval to be the next " +
+        "multiple of 5",
+  minTimeInterval: 7,
+  expectedInterval: 10
+}, {
+  minTimeInterval: 20,
+  expectedInterval: 25
+}, {
+  minTimeInterval: 33,
+  expectedInterval: 50
+}, {
+  minTimeInterval: 987,
+  expectedInterval: 1000
+}, {
+  minTimeInterval: 1234,
+  expectedInterval: 2500
+}, {
+  minTimeInterval: 9800,
+  expectedInterval: 10000
+}];
+
+function run_test() {
+  for (let {minTimeInterval, desc, expectedInterval} of TEST_DATA) {
+    do_print(`Testing minTimeInterval: ${minTimeInterval}.
+              Expecting ${expectedInterval}.`);
+
+    let interval = findOptimalTimeInterval(minTimeInterval);
+    if (typeof expectedInterval == "string") {
+      ok(eval(expectedInterval), desc);
+    } else {
+      equal(interval, expectedInterval, desc);
+    }
+  }
+}