1 files changed, 50 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-fission-frame-breakpoint.js b/devtools/client/debugger/test/mochitest/browser_dbg-fission-frame-breakpoint.js
new file mode 100644
index 0000000000..783b86f80c
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-fission-frame-breakpoint.js
@@ -0,0 +1,50 @@
+/* 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/>. */
+
+"use strict";
+
+const TEST_COM_URI = `${URL_ROOT_COM_SSL}examples/doc_dbg-fission-frame-sources.html`;
+
+add_task(async function () {
+  // Load a test page with a remote frame:
+  // simple1.js is imported by the main page. simple2.js comes from the remote frame.
+  const dbg = await initDebuggerWithAbsoluteURL(
+    TEST_COM_URI,
+    "simple1.js",
+    "simple2.js"
+  );
+  const {
+    selectors: { getSelectedSource },
+  } = dbg;
+
+  // Add breakpoint within the iframe, which is hit early on load
+  await selectSource(dbg, "simple2.js");
+  await addBreakpoint(dbg, "simple2.js", 7);
+
+  const onBreakpoint = waitForDispatch(dbg.store, "SET_BREAKPOINT");
+  info("Reload the page to hit the breakpoint on load");
+  const onReloaded = reload(dbg);
+  await onBreakpoint;
+  await waitForSelectedSource(dbg, "simple2.js");
+
+  ok(
+    getSelectedSource().url.includes("simple2.js"),
+    "Selected source is simple2.js"
+  );
+  await waitForPaused(dbg);
+  assertPausedAtSourceAndLine(dbg, findSource(dbg, "simple2.js").id, 7);
+
+  await stepIn(dbg);
+  assertPausedAtSourceAndLine(dbg, findSource(dbg, "simple2.js").id, 7);
+
+  // We can't used `stepIn` helper as this last step will resume
+  // and the helper is expecting to pause again
+  await dbg.actions.stepIn(getThreadContext(dbg));
+  assertNotPaused(dbg, "Stepping in two times resumes");
+
+  info("Wait for reload to complete after resume");
+  await onReloaded;
+
+  await dbg.toolbox.closeToolbox();
+});