1 files changed, 97 insertions, 0 deletions
diff --git a/devtools/client/aboutdebugging/test/browser_service_workers_start.js b/devtools/client/aboutdebugging/test/browser_service_workers_start.js
new file mode 100644
index 000000000..8c15d97c4
--- /dev/null
+++ b/devtools/client/aboutdebugging/test/browser_service_workers_start.js
@@ -0,0 +1,97 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that clicking on the Start button next to a Service Worker works as
+// intended in about:debugging.
+// It should cause a worker to start running in a child process.
+
+// Service workers can't be loaded from chrome://, but http:// is ok with
+// dom.serviceWorkers.testing.enabled turned on.
+const SERVICE_WORKER = URL_ROOT + "service-workers/empty-sw.js";
+const TAB_URL = URL_ROOT + "service-workers/empty-sw.html";
+
+const SW_TIMEOUT = 1000;
+
+add_task(function* () {
+  info("Turn on workers via mochitest http.");
+  yield new Promise(done => {
+    let options = { "set": [
+      // Accept workers from mochitest's http.
+      ["dom.serviceWorkers.enabled", true],
+      ["dom.serviceWorkers.openWindow.enabled", true],
+      ["dom.serviceWorkers.testing.enabled", true],
+      // Reduce the timeout to accelerate service worker freezing
+      ["dom.serviceWorkers.idle_timeout", SW_TIMEOUT],
+      ["dom.serviceWorkers.idle_extended_timeout", SW_TIMEOUT],
+    ]};
+    SpecialPowers.pushPrefEnv(options, done);
+  });
+
+  let { tab, document } = yield openAboutDebugging("workers");
+
+  // Listen for mutations in the service-workers list.
+  let serviceWorkersElement = getServiceWorkerList(document);
+  let onMutation = waitForMutation(serviceWorkersElement, { childList: true });
+
+  // Open a tab that registers an empty service worker.
+  let swTab = yield addTab(TAB_URL);
+
+  // Wait for the service-workers list to update.
+  yield onMutation;
+
+  // Check that the service worker appears in the UI.
+  assertHasTarget(true, document, "service-workers", SERVICE_WORKER);
+
+  info("Ensure that the registration resolved before trying to interact with " +
+    "the service worker.");
+  yield waitForServiceWorkerRegistered(swTab);
+  ok(true, "Service worker registration resolved");
+
+  yield waitForServiceWorkerActivation(SERVICE_WORKER, document);
+
+  // Retrieve the Target element corresponding to the service worker.
+  let names = [...document.querySelectorAll("#service-workers .target-name")];
+  let name = names.filter(element => element.textContent === SERVICE_WORKER)[0];
+  ok(name, "Found the service worker in the list");
+  let targetElement = name.parentNode.parentNode;
+
+  // The service worker may already be killed with the low 1s timeout
+  if (!targetElement.querySelector(".start-button")) {
+    // Check that there is a Debug button but not a Start button.
+    ok(targetElement.querySelector(".debug-button"), "Found its debug button");
+
+    // Wait for the service worker to be killed due to inactivity.
+    yield waitForMutation(targetElement, { childList: true });
+  } else {
+    // Check that there is no Debug button when the SW is already shut down.
+    ok(!targetElement.querySelector(".debug-button"), "No debug button when " +
+      "the worker is already killed");
+  }
+
+  // We should now have a Start button but no Debug button.
+  let startBtn = targetElement.querySelector(".start-button");
+  ok(startBtn, "Found its start button");
+  ok(!targetElement.querySelector(".debug-button"), "No debug button");
+
+  // Click on the Start button and wait for the service worker to be back.
+  let onStarted = waitForMutation(targetElement, { childList: true });
+  startBtn.click();
+  yield onStarted;
+
+  // Check that we have a Debug button but not a Start button again.
+  ok(targetElement.querySelector(".debug-button"), "Found its debug button");
+  ok(!targetElement.querySelector(".start-button"), "No start button");
+
+  // Finally, unregister the service worker itself.
+  try {
+    yield unregisterServiceWorker(swTab, serviceWorkersElement);
+    ok(true, "Service worker registration unregistered");
+  } catch (e) {
+    ok(false, "SW not unregistered; " + e);
+  }
+
+  yield removeTab(swTab);
+  yield closeAboutDebugging(tab);
+});