1 files changed, 71 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_graphs-07d.js b/devtools/client/shared/test/browser_graphs-07d.js
new file mode 100644
index 000000000..8a64f7d75
--- /dev/null
+++ b/devtools/client/shared/test/browser_graphs-07d.js
@@ -0,0 +1,71 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that selections are drawn onto the canvas.
+
+const TEST_DATA = [
+  { delta: 112, value: 48 }, { delta: 213, value: 59 },
+  { delta: 313, value: 60 }, { delta: 413, value: 59 },
+  { delta: 530, value: 59 }, { delta: 646, value: 58 },
+  { delta: 747, value: 60 }, { delta: 863, value: 48 },
+  { delta: 980, value: 37 }, { delta: 1097, value: 30 },
+  { delta: 1213, value: 29 }, { delta: 1330, value: 23 },
+  { delta: 1430, value: 10 }, { delta: 1534, value: 17 },
+  { delta: 1645, value: 20 }, { delta: 1746, value: 22 },
+  { delta: 1846, value: 39 }, { delta: 1963, value: 26 },
+  { delta: 2080, value: 27 }, { delta: 2197, value: 35 },
+  { delta: 2312, value: 47 }, { delta: 2412, value: 53 },
+  { delta: 2514, value: 60 }, { delta: 2630, value: 37 },
+  { delta: 2730, value: 36 }, { delta: 2830, value: 37 },
+  { delta: 2946, value: 36 }, { delta: 3046, value: 40 },
+  { delta: 3163, value: 47 }, { delta: 3280, value: 41 },
+  { delta: 3380, value: 35 }, { delta: 3480, value: 27 },
+  { delta: 3580, value: 39 }, { delta: 3680, value: 42 },
+  { delta: 3780, value: 49 }, { delta: 3880, value: 55 },
+  { delta: 3980, value: 60 }, { delta: 4080, value: 60 },
+  { delta: 4180, value: 60 }
+];
+const TEST_REGIONS = [{ start: 320, end: 460 }, { start: 780, end: 860 }];
+const LineGraphWidget = require("devtools/client/shared/widgets/LineGraphWidget");
+
+add_task(function* () {
+  yield addTab("about:blank");
+  yield performTest();
+  gBrowser.removeCurrentTab();
+});
+
+function* performTest() {
+  let [host,, doc] = yield createHost();
+  let graph = new LineGraphWidget(doc.body, "fps");
+  yield graph.once("ready");
+
+  testGraph(graph);
+
+  yield graph.destroy();
+  host.destroy();
+}
+
+function testGraph(graph) {
+  graph.setData(TEST_DATA);
+  graph.setRegions(TEST_REGIONS);
+
+  // Measure the color of the first pixel before any selection is made.
+  graph._onAnimationFrame();
+  let pixelNoSelection = graph._ctx.getImageData(1, 1, 1, 1).data;
+
+  graph.setSelection({ start: 0, end: 10 });
+  graph._onAnimationFrame();
+  let pixelNormalSelection = graph._ctx.getImageData(1, 1, 1, 1).data;
+
+  Assert.notDeepEqual(pixelNormalSelection, pixelNoSelection,
+    "The first pixel is part of the drawn selection.");
+
+  graph.setSelection({ start: graph.width + 100, end: -100 });
+  graph._onAnimationFrame();
+  let pixelFullSelection = graph._ctx.getImageData(1, 1, 1, 1).data;
+
+  Assert.deepEqual(pixelFullSelection, pixelNormalSelection,
+    "The first pixel is still part of the drawn selection.");
+}