1 files changed, 98 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-bfcache.js b/devtools/client/debugger/test/mochitest/browser_dbg-bfcache.js
new file mode 100644
index 0000000000..d66bd294bc
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-bfcache.js
@@ -0,0 +1,98 @@
+/* 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 the debugger when navigating using the BFCache.
+
+"use strict";
+
+PromiseTestUtils.allowMatchingRejectionsGlobally(/Connection closed/);
+
+add_task(async function () {
+  info("Run test with bfcacheInParent DISABLED");
+  await pushPref("fission.bfcacheInParent", false);
+  await testSourcesOnNavigation();
+  await testDebuggerPauseStateOnNavigation();
+
+  // bfcacheInParent only works if sessionHistoryInParent is enable
+  // so only test it if both settings are enabled.
+  if (Services.appinfo.sessionHistoryInParent) {
+    info("Run test with bfcacheInParent ENABLED");
+    await pushPref("fission.bfcacheInParent", true);
+    await testSourcesOnNavigation();
+    await testDebuggerPauseStateOnNavigation();
+  }
+});
+
+async function testSourcesOnNavigation() {
+  info(
+    "Test that sources appear in the debugger when navigating using the BFCache"
+  );
+  const dbg = await initDebugger("doc-bfcache1.html");
+
+  await navigate(dbg, "doc-bfcache2.html", "doc-bfcache2.html");
+
+  invokeInTab("goBack");
+  await waitForSources(dbg, "doc-bfcache1.html");
+
+  invokeInTab("goForward");
+  await waitForSources(dbg, "doc-bfcache2.html");
+  ok(true, "Found sources after BFCache navigations");
+
+  await dbg.toolbox.closeToolbox();
+}
+
+async function testDebuggerPauseStateOnNavigation() {
+  info("Test the debugger pause state when navigating using the BFCache");
+
+  info("Open debugger on the first page");
+  const dbg = await initDebugger("doc-bfcache1.html");
+
+  await addBreakpoint(dbg, "doc-bfcache1.html", 4);
+
+  info("Navigate to the second page");
+  await navigate(dbg, "doc-bfcache2.html");
+  await waitForSources(dbg, "doc-bfcache2.html");
+
+  info("Navigate back to the first page (which should resurect from bfcache)");
+  await goBack(`${EXAMPLE_URL}doc-bfcache1.html`);
+  await waitForSources(dbg, "doc-bfcache1.html");
+
+  // We paused when navigation back to bfcache1.html
+  // The previous navigation will prevent the page from completing its load.
+  // And we will do the same with this reload, which will pause page load
+  // and we will navigate forward and never complete the reload page load.
+  info("Reload the first page (which was in bfcache)");
+  await reloadWhenPausedBeforePageLoaded(dbg);
+  await waitForPaused(dbg);
+
+  ok(dbg.toolbox.isHighlighted("jsdebugger"), "Debugger is highlighted");
+
+  info(
+    "Navigate forward to the second page (which should also coming from bfcache)"
+  );
+  await goForward(`${EXAMPLE_URL}doc-bfcache2.html`);
+
+  await waitUntil(() => !dbg.toolbox.isHighlighted("jsdebugger"));
+  ok(true, "Debugger is not highlighted");
+
+  dbg.toolbox.closeToolbox();
+}
+
+async function goBack(expectedUrl) {
+  const onLocationChange = BrowserTestUtils.waitForLocationChange(
+    gBrowser,
+    expectedUrl
+  );
+  gBrowser.goBack();
+  await onLocationChange;
+}
+
+async function goForward(expectedUrl) {
+  const onLocationChange = BrowserTestUtils.waitForLocationChange(
+    gBrowser,
+    expectedUrl
+  );
+  gBrowser.goForward();
+  await onLocationChange;
+}