1 files changed, 39 insertions, 0 deletions
diff --git a/devtools/server/tests/xpcshell/test_stepping-13.js b/devtools/server/tests/xpcshell/test_stepping-13.js
new file mode 100644
index 0000000000..cbdb78ce2d
--- /dev/null
+++ b/devtools/server/tests/xpcshell/test_stepping-13.js
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * Check that is possible to step into both the inner and outer function
+ * calls.
+ */
+
+add_task(
+  threadFrontTest(async ({ commands, threadFront }) => {
+    dumpn("Evaluating test code and waiting for first debugger statement");
+
+    commands.scriptCommand.execute(
+      `(function () {
+        const a = () => { return 2 };
+        debugger;
+        a(a())
+      })()`
+    );
+
+    await waitForEvent(threadFront, "paused");
+    const step1 = await stepOver(threadFront);
+    Assert.equal(step1.frame.where.line, 4, "step to line 4");
+
+    const step2 = await stepIn(threadFront);
+    Assert.equal(step2.frame.where.line, 2, "step in to line 2");
+
+    const step3 = await stepOut(threadFront);
+    Assert.equal(step3.frame.where.line, 4, "step back to line 4");
+    Assert.equal(step3.frame.where.column, 9, "step out to column 9");
+
+    const step4 = await stepIn(threadFront);
+    Assert.equal(step4.frame.where.line, 2, "step in to line 2");
+
+    await threadFront.resume();
+  })
+);