1 files changed, 41 insertions, 0 deletions
diff --git a/devtools/client/performance/test/browser_timeline-waterfall-background.js b/devtools/client/performance/test/browser_timeline-waterfall-background.js
new file mode 100644
index 000000000..85d5bd28c
--- /dev/null
+++ b/devtools/client/performance/test/browser_timeline-waterfall-background.js
@@ -0,0 +1,41 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/**
+ * Tests if the waterfall background is a 1px high canvas stretching across
+ * the container bounds.
+ */
+
+const { SIMPLE_URL } = require("devtools/client/performance/test/helpers/urls");
+const { initPerformanceInNewTab, teardownToolboxAndRemoveTab } = require("devtools/client/performance/test/helpers/panel-utils");
+const { startRecording, stopRecording, waitForOverviewRenderedWithMarkers } = require("devtools/client/performance/test/helpers/actions");
+
+add_task(function* () {
+  let { panel } = yield initPerformanceInNewTab({
+    url: SIMPLE_URL,
+    win: window
+  });
+
+  let { WaterfallView } = panel.panelWin;
+
+  yield startRecording(panel);
+  ok(true, "Recording has started.");
+
+  // Ensure overview is rendering and some markers were received.
+  yield waitForOverviewRenderedWithMarkers(panel);
+
+  yield stopRecording(panel);
+  ok(true, "Recording has ended.");
+
+  // Test the waterfall background.
+
+  ok(WaterfallView.canvas, "A canvas should be created after the recording ended.");
+
+  is(WaterfallView.canvas.width, WaterfallView.waterfallWidth,
+    "The canvas width is correct.");
+  is(WaterfallView.canvas.height, 1,
+    "The canvas height is correct.");
+
+  yield teardownToolboxAndRemoveTab(panel);
+});