1 files changed, 34 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-step-in-navigate.js b/devtools/client/debugger/test/mochitest/browser_dbg-step-in-navigate.js
new file mode 100644
index 0000000000..53d66c6f12
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-step-in-navigate.js
@@ -0,0 +1,34 @@
+/* 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/>. */
+
+// Tests that Step In is cancelled when navigating to another page
+
+"use strict";
+
+add_task(async function () {
+  const dbg = await initDebugger("doc-scripts.html", "simple3.js", "long.js");
+
+  // With the debugger stopped at a breakpoint, blackbox the current source and step in
+  await selectSource(dbg, "simple3.js");
+  await addBreakpoint(dbg, "simple3.js", 5);
+  invokeInTab("simple");
+  await waitForPaused(dbg, "simple3");
+
+  await clickElement(dbg, "blackbox");
+  await waitForDispatch(dbg.store, "BLACKBOX_WHOLE_SOURCES");
+  await dbg.actions.stepIn();
+
+  // We should stop at this breakpoint, rather than the first executed script
+  await selectSource(dbg, "long.js");
+  await addBreakpoint(dbg, "long.js", 1);
+
+  // Navigation should clear the stepping state
+  const reloaded = reload(dbg);
+  await waitForPaused(dbg);
+  assertPausedAtSourceAndLine(dbg, findSource(dbg, "long.js").id, 1);
+
+  await resume(dbg);
+  await reloaded;
+  await waitForSource(dbg, "simple3.js");
+});