1 files changed, 46 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Frame-onStep-14.js b/js/src/jit-test/tests/debug/Frame-onStep-14.js
new file mode 100644
index 0000000000..a7139adb09
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Frame-onStep-14.js
@@ -0,0 +1,46 @@
+// Test how stepping interacts with switch statements.
+
+var g = newGlobal({newCompartment: true});
+
+g.eval('function bob() { return "bob"; }');
+
+// Stepping into a sparse switch should not stop on literal cases.
+evaluate(`function lit(x) {     // 1
+  debugger;                     // 2
+  switch(x) {                   // 3
+  case "nope":                  // 4
+    break;                      // 5
+  case "bob":                   // 6
+    break;                      // 7
+  }                             // 8
+}`, {lineNumber: 1, global: g});
+
+// Stepping into a sparse switch should stop on non-literal cases.
+evaluate(`function nonlit(x) {  // 1
+  debugger;                     // 2
+  switch(x) {                   // 3
+  case bob():                   // 4
+    break;                      // 5
+  }                             // 6
+}`, {lineNumber: 1, global: g});
+
+var dbg = Debugger(g);
+var badStep = false;
+
+function test(s, okLine) {
+  dbg.onDebuggerStatement = function(frame) {
+    frame.onStep = function() {
+      let thisLine = this.script.getOffsetLocation(this.offset).lineNumber;
+      // The stop at line 3 is the switch.
+      if (thisLine > 3) {
+        assertEq(thisLine, okLine)
+        frame.onStep = undefined;
+      }
+    };
+  };
+  g.eval(s);
+}
+
+test("lit('bob');", 7);
+
+test("nonlit('bob');", 4);