diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/unit/test_trace_actor-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/unit/test_trace_actor-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests that TraceActor is available and returns correct responses to
+ * startTrace and stopTrace requests.
+ */
+
+var gDebuggee;
+var gClient;
+var gTraceClient;
+
+function run_test()
+{
+  initTestTracerServer();
+  gDebuggee = addTestGlobal("test-tracer-actor");
+  gClient = new DebuggerClient(DebuggerServer.connectPipe());
+  gClient.connect(function() {
+    attachTestTab(gClient, "test-tracer-actor", function(aResponse, aTabClient) {
+      do_check_true(!!aResponse.traceActor, "TraceActor should be visible in tab");
+      gClient.attachTracer(aResponse.traceActor, function(aResponse, aTraceClient) {
+        gTraceClient = aTraceClient;
+        test_start_stop_response();
+      });
+    });
+  });
+  do_test_pending();
+}
+
+function test_start_stop_response()
+{
+  do_check_true(!gTraceClient.tracing, "TraceClient should start in idle state");
+  gTraceClient.startTrace([], null, function(aResponse) {
+    do_check_true(!!gTraceClient.tracing, "TraceClient should be in tracing state");
+    do_check_true(!aResponse.error,
+                  'startTrace should not respond with error: ' + aResponse.error);
+    do_check_eq(aResponse.type, "startedTrace",
+                'startTrace response should have "type":"startedTrace" property');
+    do_check_eq(aResponse.why, "requested",
+                'startTrace response should have "why":"requested" property');
+
+    gTraceClient.stopTrace(null, function(aResponse) {
+      do_check_true(!gTraceClient.tracing, "TraceClient should be in idle state");
+      do_check_true(!aResponse.error,
+                   'stopTrace should not respond with error: ' + aResponse.error);
+      do_check_eq(aResponse.type, "stoppedTrace",
+                  'stopTrace response should have "type":"stoppedTrace" property');
+      do_check_eq(aResponse.why, "requested",
+                  'stopTrace response should have "why":"requested" property');
+
+      finishClient(gClient);
+    });
+  });
+}