1 files changed, 42 insertions, 0 deletions
diff --git a/devtools/client/webaudioeditor/test/browser_wa_properties-view.js b/devtools/client/webaudioeditor/test/browser_wa_properties-view.js
new file mode 100644
index 000000000..bda51e4ac
--- /dev/null
+++ b/devtools/client/webaudioeditor/test/browser_wa_properties-view.js
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests that params view shows params when they exist, and are hidden otherwise.
+ */
+
+add_task(function* () {
+  let { target, panel } = yield initWebAudioEditor(SIMPLE_CONTEXT_URL);
+  let { panelWin } = panel;
+  let { gFront, $, $$, EVENTS, PropertiesView } = panelWin;
+  let gVars = PropertiesView._propsView;
+
+  let started = once(gFront, "start-context");
+
+  let events = Promise.all([
+    get3(gFront, "create-node"),
+    waitForGraphRendered(panelWin, 3, 2)
+  ]);
+  reload(target);
+  let [actors] = yield events;
+  let nodeIds = actors.map(actor => actor.actorID);
+
+  // Gain node
+  click(panelWin, findGraphNode(panelWin, nodeIds[2]));
+  yield waitForInspectorRender(panelWin, EVENTS);
+
+  ok(isVisible($("#properties-content")), "Parameters shown when they exist.");
+  ok(!isVisible($("#properties-empty")),
+    "Empty message hidden when AudioParams exist.");
+
+  // Destination node
+  click(panelWin, findGraphNode(panelWin, nodeIds[0]));
+  yield waitForInspectorRender(panelWin, EVENTS);
+
+  ok(!isVisible($("#properties-content")),
+    "Parameters hidden when they don't exist.");
+  ok(isVisible($("#properties-empty")),
+    "Empty message shown when no AudioParams exist.");
+
+  yield teardown(target);
+});