1 files changed, 65 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-link-reload.js b/devtools/client/debugger/test/mochitest/browser_dbg-link-reload.js
new file mode 100644
index 0000000000..c374fc6bba
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-link-reload.js
@@ -0,0 +1,65 @@
+/* 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 reload via an href link, which refers to the same document.
+ * It seems to cause different codepath compared to F5.
+ */
+
+"use strict";
+
+add_task(async function () {
+  const dbg = await initDebugger(
+    "doc-reload-link.html",
+    "doc-reload-link.html"
+  );
+
+  info("Add a breakpoint that will be hit on reload");
+  await addBreakpoint(dbg, "doc-reload-link.html", 3);
+
+  for (let i = 0; i < 5; i++) {
+    const onReloaded = waitForReload(dbg.commands);
+
+    info(
+      "Reload via a link, this causes special race condition different from F5"
+    );
+    await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+      const reloadLink = content.document.querySelector("a");
+      reloadLink.click();
+    });
+
+    info("Wait for paused\n");
+    await waitForPaused(dbg);
+
+    info("Check paused location\n");
+    const source = findSource(dbg, "doc-reload-link.html");
+    assertPausedAtSourceAndLine(dbg, source.id, 3);
+
+    await resume(dbg);
+
+    info("Wait for completion of the page load");
+    // This help ensure that the page loaded correctly and prevent pending request at teardown
+    await onReloaded;
+  }
+});
+
+async function waitForReload(commands) {
+  let resolve;
+  const onReloaded = new Promise(r => (resolve = r));
+  const { resourceCommand } = commands;
+  const { DOCUMENT_EVENT } = resourceCommand.TYPES;
+  const onAvailable = resources => {
+    if (resources.find(resource => resource.name == "dom-complete")) {
+      resourceCommand.unwatchResources([DOCUMENT_EVENT], { onAvailable });
+      resolve();
+    }
+  };
+  // Wait for watchResources completion before reloading, otherwise we might miss the dom-complete event
+  // if watchResources is still pending while the reload already started and finished loading the document early.
+  await resourceCommand.watchResources([DOCUMENT_EVENT], {
+    onAvailable,
+    ignoreExistingResources: true,
+  });
+  return onReloaded;
+}