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diff --git a/devtools/client/shared/test/browser_graphs-01.js b/devtools/client/shared/test/browser_graphs-01.js
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+++ b/devtools/client/shared/test/browser_graphs-01.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that graph widgets works properly.
+
+const LineGraphWidget = require("devtools/client/shared/widgets/LineGraphWidget");
+
+add_task(function* () {
+ yield addTab("about:blank");
+ yield performTest();
+ gBrowser.removeCurrentTab();
+ finish();
+});
+
+function* performTest() {
+ let [host,, doc] = yield createHost();
+ doc.body.setAttribute("style",
+ "position: fixed; width: 100%; height: 100%; margin: 0;");
+
+ let graph = new LineGraphWidget(doc.body, "fps");
+
+ let readyEventEmitted;
+ graph.once("ready", () => {
+ readyEventEmitted = true;
+ });
+
+ yield graph.ready();
+ ok(readyEventEmitted, "The 'ready' event should have been emitted");
+
+ testGraph(host, graph);
+
+ yield graph.destroy();
+ host.destroy();
+}
+
+function testGraph(host, graph) {
+ ok(graph._container.classList.contains("line-graph-widget-container"),
+ "The correct graph container was created.");
+ ok(graph._canvas.classList.contains("line-graph-widget-canvas"),
+ "The correct graph container was created.");
+
+ let bounds = host.frame.getBoundingClientRect();
+
+ is(graph.width, bounds.width * window.devicePixelRatio,
+ "The graph has the correct width.");
+ is(graph.height, bounds.height * window.devicePixelRatio,
+ "The graph has the correct height.");
+
+ ok(graph._cursor.x === null,
+ "The graph's cursor X coordinate is initially null.");
+ ok(graph._cursor.y === null,
+ "The graph's cursor Y coordinate is initially null.");
+
+ ok(graph._selection.start === null,
+ "The graph's selection start value is initially null.");
+ ok(graph._selection.end === null,
+ "The graph's selection end value is initially null.");
+
+ ok(graph._selectionDragger.origin === null,
+ "The graph's dragger origin value is initially null.");
+ ok(graph._selectionDragger.anchor.start === null,
+ "The graph's dragger anchor start value is initially null.");
+ ok(graph._selectionDragger.anchor.end === null,
+ "The graph's dragger anchor end value is initially null.");
+
+ ok(graph._selectionResizer.margin === null,
+ "The graph's resizer margin value is initially null.");
+}