1 files changed, 72 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-features-breakpoints.js b/devtools/client/debugger/test/mochitest/browser_dbg-features-breakpoints.js
new file mode 100644
index 0000000000..6cd3354cff
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-features-breakpoints.js
@@ -0,0 +1,72 @@
+/* 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";
+
+/**
+ * Assert that breakpoints and stepping works in various conditions
+ */
+
+const testServer = createVersionizedHttpTestServer(
+  "examples/sourcemaps-reload-uncompressed"
+);
+const TEST_URL = testServer.urlFor("index.html");
+
+add_task(
+  async function testSteppingFromOriginalToGeneratedAndAnotherOriginal() {
+    const dbg = await initDebuggerWithAbsoluteURL(
+      TEST_URL,
+      "index.html",
+      "script.js",
+      "original.js"
+    );
+
+    await selectSource(dbg, "original.js");
+    await addBreakpoint(dbg, "original.js", 8);
+    assertBreakpointSnippet(dbg, 1, "await nonSourceMappedFunction();");
+
+    info("Test pausing on an original source");
+    invokeInTab("foo");
+    await waitForPaused(dbg, "original.js");
+    assertPausedAtSourceAndLine(dbg, findSource(dbg, "original.js").id, 8);
+
+    info("Then stepping into a generated source");
+    await stepIn(dbg);
+    assertPausedAtSourceAndLine(dbg, findSource(dbg, "script.js").id, 5);
+
+    info("Stepping another time within the same generated source");
+    await stepIn(dbg);
+    assertPausedAtSourceAndLine(dbg, findSource(dbg, "script.js").id, 7);
+
+    info("And finally stepping into another original source");
+    await stepIn(dbg);
+    assertPausedAtSourceAndLine(
+      dbg,
+      findSource(dbg, "removed-original.js").id,
+      4
+    );
+
+    info("Walk up the stack backward, until we resume execution");
+    await stepIn(dbg);
+    assertPausedAtSourceAndLine(
+      dbg,
+      findSource(dbg, "removed-original.js").id,
+      5
+    );
+
+    await stepIn(dbg);
+    assertPausedAtSourceAndLine(dbg, findSource(dbg, "script.js").id, 8);
+
+    await stepIn(dbg);
+    assertPausedAtSourceAndLine(dbg, findSource(dbg, "original.js").id, 9);
+
+    await stepIn(dbg);
+    assertPausedAtSourceAndLine(dbg, findSource(dbg, "original.js").id, 10);
+
+    // We can't use the `stepIn` helper as this last step will resume
+    // and the helper is expecting to pause again
+    await dbg.actions.stepIn(getThreadContext(dbg));
+    await assertNotPaused(dbg);
+  }
+);