diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_break-on-dom-07.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_break-on-dom-07.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,104 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests that system event listeners don't get duplicated in the view.
+ */
+
+function test() {
+  initDebugger("about:blank").then(([aTab, aDebuggee, aPanel]) => {
+    let gDebugger = aPanel.panelWin;
+    let gView = gDebugger.DebuggerView;
+    let gEvents = gView.EventListeners;
+    let gL10N = gDebugger.L10N;
+
+    is(gEvents.itemCount, 0,
+      "There are no events displayed in the corresponding pane yet.");
+
+    gEvents.addListener({
+      type: "foo",
+      node: { selector: "#first" },
+      function: { url: null }
+    });
+
+    is(gEvents.itemCount, 1,
+      "There was a system event listener added in the view.");
+    is(gEvents.attachments[0].url, gL10N.getStr("eventNative"),
+      "The correct string is used as the event's url.");
+    is(gEvents.attachments[0].type, "foo",
+      "The correct string is used as the event's type.");
+    is(gEvents.attachments[0].selectors.toString(), "#first",
+      "The correct array of selectors is used as the event's target.");
+
+    gEvents.addListener({
+      type: "bar",
+      node: { selector: "#second" },
+      function: { url: null }
+    });
+
+    is(gEvents.itemCount, 2,
+      "There was another system event listener added in the view.");
+    is(gEvents.attachments[1].url, gL10N.getStr("eventNative"),
+      "The correct string is used as the event's url.");
+    is(gEvents.attachments[1].type, "bar",
+      "The correct string is used as the event's type.");
+    is(gEvents.attachments[1].selectors.toString(), "#second",
+      "The correct array of selectors is used as the event's target.");
+
+    gEvents.addListener({
+      type: "foo",
+      node: { selector: "#first" },
+      function: { url: null }
+    });
+
+    is(gEvents.itemCount, 2,
+      "There wasn't another system event listener added in the view.");
+    is(gEvents.attachments[0].url, gL10N.getStr("eventNative"),
+      "The correct string is used as the event's url.");
+    is(gEvents.attachments[0].type, "foo",
+      "The correct string is used as the event's type.");
+    is(gEvents.attachments[0].selectors.toString(), "#first",
+      "The correct array of selectors is used as the event's target.");
+
+    gEvents.addListener({
+      type: "foo",
+      node: { selector: "#second" },
+      function: { url: null }
+    });
+
+    is(gEvents.itemCount, 2,
+      "There still wasn't another system event listener added in the view.");
+    is(gEvents.attachments[0].url, gL10N.getStr("eventNative"),
+      "The correct string is used as the event's url.");
+    is(gEvents.attachments[0].type, "foo",
+      "The correct string is used as the event's type.");
+    is(gEvents.attachments[0].selectors.toString(), "#first,#second",
+      "The correct array of selectors is used as the event's target.");
+
+
+    gEvents.addListener({
+      type: null,
+      node: { selector: "#bogus" },
+      function: { url: null }
+    });
+
+    is(gEvents.itemCount, 2,
+      "No bogus system event listener was added in the view.");
+
+    is(gEvents.attachments[0].url, gL10N.getStr("eventNative"),
+      "The correct string is used as the first event's url.");
+    is(gEvents.attachments[0].type, "foo",
+      "The correct string is used as the first event's type.");
+    is(gEvents.attachments[0].selectors.toString(), "#first,#second",
+      "The correct array of selectors is used as the first event's target.");
+
+    is(gEvents.attachments[1].url, gL10N.getStr("eventNative"),
+      "The correct string is used as the second event's url.");
+    is(gEvents.attachments[1].type, "bar",
+      "The correct string is used as the second event's type.");
+    is(gEvents.attachments[1].selectors.toString(), "#second",
+      "The correct array of selectors is used as the second event's target.");
+
+    closeDebuggerAndFinish(aPanel);
+  });
+}