1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Object-getErrorMessageName.js b/js/src/jit-test/tests/debug/Object-getErrorMessageName.js
new file mode 100644
index 0000000000..11c98d93e5
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Object-getErrorMessageName.js
@@ -0,0 +1,29 @@
+// Debugger.Object.prototype.getErrorMessageName returns the error message name
+// associated with some error object.
+
+var g = newGlobal({newCompartment: true});
+var dbg = new Debugger();
+var gw = dbg.addDebuggee(g);
+
+assertEq(gw.executeInGlobal("(42).toString(0)").throw.errorMessageName, "JSMSG_BAD_RADIX");
+
+// Custom errors have no error message name.
+assertEq(gw.executeInGlobal("throw new Error()").throw.errorMessageName, undefined);
+
+// Ensure that the method works across globals.
+g.eval(`var g = newGlobal({newCompartment: true});
+        g.eval('var err; try { (42).toString(0); } catch (e) { err = e; }');
+        var err2 = g.err;`);
+assertEq(gw.executeInGlobal("throw err2").throw.errorMessageName, "JSMSG_BAD_RADIX");
+
+// Ensure that non-error objects return undefined.
+const Args = [
+    "1",
+    "'blah'",
+    "({})",
+    "[]",
+    "() => 1"
+]
+
+for (let arg of Args)
+    assertEq(gw.executeInGlobal(`${arg}`).return.errorMessageName, undefined);