diff -r 000000000000 -r 6474c204b198 browser/devtools/webaudioeditor/test/browser_wa_graph_mouseover.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webaudioeditor/test/browser_wa_graph_mouseover.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests if the shader editor shows the appropriate UI when opened.
+ */
+
+function spawnTest() {
+  let [target, debuggee, panel] = yield initWebAudioEditor(COMPLEX_CONTEXT_URL);
+  let { gFront, $, $$, EVENTS, WebAudioParamView } = panel.panelWin;
+  let gVars = WebAudioParamView._paramsView;
+
+  let started = once(gFront, "start-context");
+
+  reload(target);
+
+  yield Promise.all([
+    getN(gFront, "create-node", 8),
+    getNSpread(panel.panelWin, EVENTS.UI_ADD_NODE_LIST, 8),
+    waitForGraphRendered(panel.panelWin, 8, 8)
+  ]);
+
+  let $items = $$(".variables-view-scope");
+  let $graphNodes = $$(".nodes > g");
+
+  for (let $item of $items) {
+    mouseOver(panel.panelWin, $(".devtools-toolbar", $item));
+    // Get actorID from id of variable scope
+    let id = $item.id.match(/\(([^\)]*)\)/)[1];
+
+    // Go over all graph nodes and check only the selected one is highlighted
+    for (let $node of $graphNodes) {
+      let shouldBeSelected = id === $node.getAttribute("data-id");
+      ok($node.classList.contains("selected") === shouldBeSelected,
+        "graph node correctly " + (shouldBeSelected ? "" : "not ") + "highlighted on param view mouseover");
+    }
+  }
+
+  yield teardown(panel);
+  finish();
+}
+