diff -r 000000000000 -r 6474c204b198 browser/devtools/shadereditor/test/browser_se_programs-highlight-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/shadereditor/test/browser_se_programs-highlight-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests if highlighting a program works properly in tandem with blended
+ * overlapping geometry.
+ */
+
+function ifWebGLSupported() {
+  let [target, debuggee, panel] = yield initShaderEditor(BLENDED_GEOMETRY_CANVAS_URL);
+  let { gFront, EVENTS, ShadersListView, ShadersEditorsView } = panel.panelWin;
+
+  reload(target);
+  let [[firstProgramActor, secondProgramActor]] = yield promise.all([
+    getPrograms(gFront, 2),
+    once(panel.panelWin, EVENTS.SOURCES_SHOWN)
+  ]);
+
+  yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 127, g: 127, b: 127, a: 255 }, true);
+  yield ensurePixelIs(debuggee, { x: 64, y: 64 }, { r: 0, g: 127, b: 127, a: 127 }, true);
+  ok(true, "The canvas was correctly drawn.");
+
+  ShadersListView._onProgramMouseEnter({ target: getItemLabel(panel, 0) });
+
+  yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 127, g: 0, b: 32, a: 255 }, true);
+  yield ensurePixelIs(debuggee, { x: 64, y: 64 }, { r: 0, g: 0, b: 32, a: 127 }, true);
+  ok(true, "The first program was correctly highlighted.");
+
+  ShadersListView._onProgramMouseLeave({ target: getItemLabel(panel, 0) });
+  ShadersListView._onProgramMouseEnter({ target: getItemLabel(panel, 1) });
+
+  yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 127, g: 127, b: 127, a: 255 }, true);
+  yield ensurePixelIs(debuggee, { x: 64, y: 64 }, { r: 255, g: 0, b: 64, a: 255 }, true);
+  ok(true, "The second program was correctly highlighted.");
+
+  ShadersListView._onProgramMouseLeave({ target: getItemLabel(panel, 1) });
+
+  yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 127, g: 127, b: 127, a: 255 }, true);
+  yield ensurePixelIs(debuggee, { x: 64, y: 64 }, { r: 0, g: 127, b: 127, a: 127 }, true);
+  ok(true, "The two programs were correctly unhighlighted.");
+
+  yield teardown(panel);
+  finish();
+}
+
+function getItemLabel(aPanel, aIndex) {
+  return aPanel.panelWin.document.querySelectorAll(
+    ".side-menu-widget-item-contents")[aIndex];
+}