1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Script-sourceStart-03.js b/js/src/jit-test/tests/debug/Script-sourceStart-03.js
new file mode 100644
index 000000000..1910dde5a
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Script-sourceStart-03.js
@@ -0,0 +1,35 @@
+/*
+ * For arrow functions, Script.prototype.sourceStart and
+ * Script.prototype.sourceLength should comprise the entire function expression
+ * (including arguments)
+ */
+let g = newGlobal();
+let dbg = new Debugger(g);
+
+function test(string, ranges) {
+    var index = 0;
+    dbg.onNewScript = function (script) {
+        function traverse(script) {
+            script.getChildScripts().forEach(function (script) {
+                assertEq(script.sourceStart, ranges[index][0]);
+                assertEq(script.sourceLength, ranges[index][1]);
+                ++index;
+                traverse(script);
+            });
+        }
+        traverse(script);
+    };
+
+    g.eval(string);
+
+    /*
+     * In some configurations certain child scripts are listed twice, so we
+     * cannot rely on index always having the exact same value
+     */
+    assertEq(0 < index && index <= ranges.length, true);
+};
+
+test("() => {}", [[0, 8]]);
+test("(x, y) => { x * y }", [[0, 19]]);
+test("x => x * x", [[0, 10]]);
+test("x => x => x * x", [[0, 15], [5, 10], [5, 10]]);