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diff --git a/devtools/server/tests/unit/test_promises_object_timetosettle-01.js b/devtools/server/tests/unit/test_promises_object_timetosettle-01.js
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+++ b/devtools/server/tests/unit/test_promises_object_timetosettle-01.js
@@ -0,0 +1,80 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Test whether or not we get the time to settle depending on the state of the
+ * promise.
+ */
+
+"use strict";
+
+const { PromisesFront } = require("devtools/shared/fronts/promises");
+
+var events = require("sdk/event/core");
+
+add_task(function* () {
+  let client = yield startTestDebuggerServer("test-promises-timetosettle");
+  let chromeActors = yield getChromeActors(client);
+
+  ok(Promise.toString().includes("native code"), "Expect native DOM Promise.");
+
+  // We have to attach the chrome TabActor before playing with the PromiseActor
+  yield attachTab(client, chromeActors);
+  yield testGetTimeToSettle(client, chromeActors, () => {
+    let p = new Promise(() => {});
+    p.name = "p";
+    let q = p.then();
+    q.name = "q";
+
+    return p;
+  });
+
+  let response = yield listTabs(client);
+  let targetTab = findTab(response.tabs, "test-promises-timetosettle");
+  ok(targetTab, "Found our target tab.");
+
+  yield testGetTimeToSettle(client, targetTab, () => {
+    const debuggee =
+      DebuggerServer.getTestGlobal("test-promises-timetosettle");
+
+    let p = new debuggee.Promise(() => {});
+    p.name = "p";
+    let q = p.then();
+    q.name = "q";
+
+    return p;
+  });
+
+  yield close(client);
+});
+
+function* testGetTimeToSettle(client, form, makePromises) {
+  let front = PromisesFront(client, form);
+
+  yield front.attach();
+  yield front.listPromises();
+
+  let onNewPromise = new Promise(resolve => {
+    events.on(front, "new-promises", promises => {
+      for (let p of promises) {
+        if (p.promiseState.state === "pending") {
+          ok(!p.promiseState.timeToSettle,
+            "Expect no time to settle for unsettled promise.");
+        } else {
+          ok(p.promiseState.timeToSettle,
+            "Expect time to settle for settled promise.");
+          equal(typeof p.promiseState.timeToSettle, "number",
+            "Expect time to settle to be a number.");
+        }
+      }
+      resolve();
+    });
+  });
+
+  let promise = makePromises();
+
+  yield onNewPromise;
+  yield front.detach();
+  // Appease eslint
+  void promise;
+}