2 files changed, 100 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/webappapis/idle-callbacks/callback-suspended.html b/testing/web-platform/tests/html/webappapis/idle-callbacks/callback-suspended.html
new file mode 100644
index 000000000..6040de922
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/idle-callbacks/callback-suspended.html
@@ -0,0 +1,93 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Dispatching idle callbacks should be able to be suspended and then resumed</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id="log"></div>
+<script>
+  function withEventListener(target, event, handler) {
+    handler = handler || (e => e);
+    return new Promise(resolve => {
+      let wrapper = function(e) {
+        let result = handler(e);
+        if (!result) {
+          return;
+        }
+
+        resolve(result);
+      }
+      target.addEventListener(event, wrapper, { once: true });
+    });
+  }
+
+  function makePostBackUrl(name) {
+    return new URL('resources/post_name_on_load.html?name=' + name,
+                   window.location).href;
+  }
+
+  function waitForMessage(message, handler) {
+    return withEventListener(window, 'message', e => (e.data === message) && handler(e));;
+  }
+
+  function withWindow(name) {
+    let win = window.open(makePostBackUrl(name))
+    return waitForMessage(name, _ => win);
+  }
+
+  function navigateWindow(win, name) {
+    win.location = makePostBackUrl(name);
+    return waitForMessage(name, _ => win);
+  }
+
+  function waitDuration(delay) {
+    return new Promise(resolve => {
+      setTimeout(resolve, delay);
+    })
+  }
+
+  function goBack(win) {
+    var p = withEventListener(win, 'pagehide');
+    win.history.back();
+    return p;
+  }
+
+  promise_test(t => {
+    let idleCalled = false;
+    let running = true;
+    return withWindow('foo')
+      .then(win => {
+        let callback = function(d) {
+          idleCalled = true;
+          if (running) {
+            win.requestIdleCallback(callback);
+          }
+        };
+
+        win.requestIdleCallback(callback);
+
+        return navigateWindow(win, 'bar')
+          .then(_ => idleCalled = false)
+          .then(_ => waitDuration(2000))
+          .then(_ => {
+            assert_false(idleCalled, "idle callback shouldn't have been called yet");
+            return goBack(win);
+          })
+          .then(_ => Promise.race([
+            // At this point it's a matter of having bfcache ...
+            waitDuration(2000)
+              .then(_ => {
+                assert_true(idleCalled, "idle callback should've been called by now");
+                running = false;
+              }),
+            // ... or not. If not, we expect a load event.
+            waitForMessage("foo")
+          ]))
+          .then(_ => win.close())
+          .catch(e => {
+            win.close();
+            throw e;
+          })
+      });
+  });
+
+</script>
diff --git a/testing/web-platform/tests/html/webappapis/idle-callbacks/resources/post_name_on_load.html b/testing/web-platform/tests/html/webappapis/idle-callbacks/resources/post_name_on_load.html
new file mode 100644
index 000000000..4679a6e6e
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/idle-callbacks/resources/post_name_on_load.html
@@ -0,0 +1,7 @@
+<!doctype html>
+<script>
+  addEventListener('load', _ => {
+    let params = new URLSearchParams(window.location.search);
+    window.opener.postMessage(params.get('name'), '*');
+  });
+</script>