diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/unit/test_breakpoint-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/unit/test_breakpoint-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,50 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check that setting breakpoints when the debuggee is running works.
+ */
+
+var gDebuggee;
+var gClient;
+var gThreadClient;
+
+function run_test()
+{
+  initTestDebuggerServer();
+  gDebuggee = addTestGlobal("test-stack");
+  gClient = new DebuggerClient(DebuggerServer.connectPipe());
+  gClient.connect(function () {
+    attachTestTabAndResume(gClient, "test-stack", function (aResponse, aTabClient, aThreadClient) {
+      gThreadClient = aThreadClient;
+      test_breakpoint_running();
+    });
+  });
+  do_test_pending();
+}
+
+function test_breakpoint_running()
+{
+  gDebuggee.eval("var line0 = Error().lineNumber;\n" +
+                 "var a = 1;\n" +  // line0 + 1
+                 "var b = 2;\n");  // line0 + 2
+
+  let path = getFilePath('test_breakpoint-02.js');
+  let location = { url: path, line: gDebuggee.line0 + 2};
+
+  // Setting the breakpoint later should interrupt the debuggee.
+  gThreadClient.addOneTimeListener("paused", function (aEvent, aPacket) {
+    do_check_eq(aPacket.type, "paused");
+    do_check_eq(aPacket.why.type, "interrupted");
+  });
+
+  gThreadClient.setBreakpoint(location, function(aResponse) {
+    // Eval scripts don't stick around long enough for the breakpoint to be set,
+    // so just make sure we got the expected response from the actor.
+    do_check_neq(aResponse.error, "noScript");
+
+    do_execute_soon(function() {
+      finishClient(gClient);
+    });
+  });
+}