1 files changed, 30 insertions, 0 deletions
diff --git a/toolkit/modules/tests/xpcshell/test_Log_stackTrace.js b/toolkit/modules/tests/xpcshell/test_Log_stackTrace.js
new file mode 100644
index 000000000..6e53db058
--- /dev/null
+++ b/toolkit/modules/tests/xpcshell/test_Log_stackTrace.js
@@ -0,0 +1,30 @@
+print("Define some functions in well defined line positions for the test");
+function foo(v) { return bar(v + 1); } // line 2
+function bar(v) { return baz(v + 1); } // line 3
+function baz(v) { throw new Error(v + 1); } // line 4
+
+print("Make sure lazy constructor calling/assignment works");
+Components.utils.import("resource://gre/modules/Log.jsm");
+
+function run_test() {
+  print("Make sure functions, arguments, files are pretty printed in the trace");
+  let trace = "";
+  try {
+    foo(0);
+  }
+  catch (ex) {
+    trace = Log.stackTrace(ex);
+  }
+  print(`Got trace: ${trace}`);
+  do_check_neq(trace, "");
+
+  let bazPos = trace.indexOf("baz@test_Log_stackTrace.js:4");
+  let barPos = trace.indexOf("bar@test_Log_stackTrace.js:3");
+  let fooPos = trace.indexOf("foo@test_Log_stackTrace.js:2");
+  print(`String positions: ${bazPos} ${barPos} ${fooPos}`);
+
+  print("Make sure the desired messages show up");
+  do_check_true(bazPos >= 0);
+  do_check_true(barPos > bazPos);
+  do_check_true(fooPos > barPos);
+}