1 files changed, 68 insertions, 0 deletions
diff --git a/devtools/server/tests/xpcshell/test_breakpoint-06.js b/devtools/server/tests/xpcshell/test_breakpoint-06.js
new file mode 100644
index 0000000000..79ddcdc3d4
--- /dev/null
+++ b/devtools/server/tests/xpcshell/test_breakpoint-06.js
@@ -0,0 +1,68 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable no-shadow, max-nested-callbacks */
+
+"use strict";
+
+/**
+ * Check that setting a breakpoint in a line without code in a deeply-nested
+ * child script will skip forward.
+ */
+
+add_task(
+  threadFrontTest(({ threadFront, debuggee }) => {
+    return new Promise(resolve => {
+      threadFront.once("paused", async function (packet) {
+        const source = await getSourceById(
+          threadFront,
+          packet.frame.where.actor
+        );
+        const location = { line: debuggee.line0 + 5 };
+
+        source.setBreakpoint(location).then(function ([response, bpClient]) {
+          // Check that the breakpoint has properly skipped forward one line.
+          Assert.equal(response.actualLocation.source.actor, source.actor);
+          Assert.equal(response.actualLocation.line, location.line + 1);
+
+          threadFront.once("paused", function (packet) {
+            // Check the return value.
+            Assert.equal(packet.frame.where.actor, source.actor);
+            Assert.equal(packet.frame.where.line, location.line + 1);
+            Assert.equal(packet.why.type, "breakpoint");
+            Assert.equal(packet.why.actors[0], bpClient.actor);
+            // Check that the breakpoint worked.
+            Assert.equal(debuggee.a, 1);
+            Assert.equal(debuggee.b, undefined);
+
+            // Remove the breakpoint.
+            bpClient.remove(function (response) {
+              threadFront.resume().then(resolve);
+            });
+          });
+
+          // Continue until the breakpoint is hit.
+          threadFront.resume();
+        });
+      });
+
+      // prettier-ignore
+      Cu.evalInSandbox(
+        "var line0 = Error().lineNumber;\n" +
+        "function foo() {\n" +     // line0 + 1
+        "  function bar() {\n" +   // line0 + 2
+        "    function baz() {\n" + // line0 + 3
+        "      this.a = 1;\n" +    // line0 + 4
+        "      // A comment.\n" +  // line0 + 5
+        "      this.b = 2;\n" +    // line0 + 6
+        "    }\n" +                // line0 + 7
+        "    baz();\n" +           // line0 + 8
+        "  }\n" +                  // line0 + 9
+        "  bar();\n" +             // line0 + 10
+        "}\n" +                    // line0 + 11
+        "debugger;\n" +            // line0 + 12
+        "foo();\n",               // line0 + 13
+        debuggee
+      );
+    });
+  })
+);