1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onStep-async-01.js b/js/src/jit-test/tests/debug/Frame-onStep-async-01.js
new file mode 100644
index 0000000000..4490524f2c
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-onStep-async-01.js
@@ -0,0 +1,35 @@
+// Stepping works across `await` in async functions.
+
+// Set up debuggee.
+var g = newGlobal({newCompartment: true});
+g.log = "";
+g.eval(`                              // line 1
+async function aloop() {              // 2
+    for (let i = 0; i < 3; i++) {     // 3
+        await i;                      // 4
+        log += " ";                   // 5
+    }                                 // 6
+    log += "^";                       // 7
+}
+`);
+
+// Set up debugger.
+let previousLine = -1;
+let dbg = new Debugger(g);
+dbg.onEnterFrame = frame => {
+    frame.onStep = function () {
+        assertEq(this, frame);
+        let line = frame.script.getOffsetLocation(frame.offset).lineNumber;
+        if (previousLine != line) {
+            g.log += line; // We stepped to a new line.
+            previousLine = line;
+        }
+    };
+    dbg.onEnterFrame = undefined;
+};
+
+// Run.
+g.aloop();
+drainJobQueue();
+
+assertEq(g.log, "2345 345 345 37^");