Bug 1641796 - Add a debugger test for service worker sources on page reload r=jlast

Depends on D79053

Differential Revision: https://phabricator.services.mozilla.com/D79059

devtools/client/debugger/test/mochitest/browser.ini

@@ -186,6 +186,8 @@ skip-if = true #Bug 1571994
 [browser_dbg-windowless-workers.js]
 [browser_dbg-windowless-workers-early-breakpoint.js]
 [browser_dbg-worker-exception.js]
+[browser_dbg-windowless-service-workers-reload.js]
+skip-if = !serviceworker_e10s # parent intercept mode required.
 [browser_dbg-windowless-service-workers.js]
 skip-if = !nightly_build || (os == 'linux' && ccov) # parent intercept mode is needed bug 1588154. Bug 1613543, the test consistently timeouts on Linux coverage builds.
 [browser_dbg-worker-scopes.js]

devtools/client/debugger/test/mochitest/browser_dbg-windowless-service-workers-reload.js

@@ -0,0 +1,29 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+// Test that service worker sources are still displayed after reloading the page
+// and that we can hit breakpoints in them.
+add_task(async function() {
+  await pushPref("devtools.debugger.features.windowless-service-workers", true);
+  await pushPref("devtools.debugger.workers-visible", true);
+  await pushPref("dom.serviceWorkers.enabled", true);
+  await pushPref("dom.serviceWorkers.testing.enabled", true);
+  const dbg = await initDebugger("doc-service-workers.html");
+
+  invokeInTab("registerWorker");
+  await waitForSource(dbg, "service-worker.sjs");
+  const workerSource = findSource(dbg, "service-worker.sjs");
+
+  await reload(dbg, "service-worker.sjs");
+
+  await addBreakpoint(dbg, "service-worker.sjs", 13);
+  invokeInTab("fetchFromWorker");
+
+  await waitForPaused(dbg);
+  assertPausedAtSourceAndLine(dbg, workerSource.id, 13);
+
+  await resume(dbg);
+  await waitForRequestsToSettle(dbg);
+  await removeTab(gBrowser.selectedTab);
+});