diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/unit/test_listsources-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/unit/test_listsources-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check basic getSources functionality.
+ */
+
+var gDebuggee;
+var gClient;
+var gThreadClient;
+
+var gNumTimesSourcesSent = 0;
+
+function run_test()
+{
+  initTestDebuggerServer();
+  gDebuggee = addTestGlobal("test-stack");
+  gClient = new DebuggerClient(DebuggerServer.connectPipe());
+  gClient.request = (function (request) {
+    return function (aRequest, aOnResponse) {
+      if (aRequest.type === "sources") {
+        ++gNumTimesSourcesSent;
+      }
+      return request.call(this, aRequest, aOnResponse);
+    };
+  }(gClient.request));
+  gClient.connect(function () {
+    attachTestTabAndResume(gClient, "test-stack", function (aResponse, aTabClient, aThreadClient) {
+      gThreadClient = aThreadClient;
+      test_simple_listsources();
+    });
+  });
+  do_test_pending();
+}
+
+function test_simple_listsources()
+{
+  gThreadClient.addOneTimeListener("paused", function (aEvent, aPacket) {
+    gThreadClient.getSources(function (aResponse) {
+      do_check_true(aResponse.sources.some(function (s) {
+        return s.url.match(/test_listsources-01.js$/);
+      }));
+
+      do_check_true(gNumTimesSourcesSent <= 1,
+                    "Should only send one sources request at most, even though we"
+                    + " might have had to send one to determine feature support.");
+
+      gThreadClient.resume(function () {
+        finishClient(gClient);
+      });
+    });
+  });
+
+  gDebuggee.eval("var line0 = Error().lineNumber;\n" +
+       "debugger;\n" +   // line0 + 1
+       "var a = 1;\n" +  // line0 + 2
+       "var b = 2;\n");  // line0 + 3
+}