1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onStep-generators-01.js b/js/src/jit-test/tests/debug/Frame-onStep-generators-01.js
new file mode 100644
index 0000000000..7fbf26a94d
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-onStep-generators-01.js
@@ -0,0 +1,31 @@
+// Stepping into the `.next()` method of a generator works as expected.
+
+let g = newGlobal({newCompartment: true});
+g.eval(`\
+function* nums() {      // line 1
+    yield 1;            //  2
+    yield 2;            //  3
+}                       //  4
+function f() {          //  5
+    let gen = nums();   //  6
+    gen.next();         //  7
+    gen.next();         //  8
+    gen.next();         //  9
+}                       // 10
+`);
+
+let log = [];
+let previousLine = -1;
+let dbg = new Debugger(g);
+dbg.onEnterFrame = frame => {
+    frame.onStep = () => {
+        let line = frame.script.getOffsetLocation(frame.offset).lineNumber;
+        if (previousLine != line) { // We stepped to a new line.
+            log.push(line);
+            previousLine = line;
+        }
+    };
+};
+
+g.f();
+assertEq(log.join(" "), "5 6 1 6 7 1 2 7 8 2 3 8 9 3 9 10");