1 files changed, 53 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_theme_switching.js b/devtools/client/shared/test/browser_theme_switching.js
new file mode 100644
index 000000000..392462a67
--- /dev/null
+++ b/devtools/client/shared/test/browser_theme_switching.js
@@ -0,0 +1,53 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(function* () {
+  let target = TargetFactory.forTab(gBrowser.selectedTab);
+  let toolbox = yield gDevTools.showToolbox(target);
+  let doc = toolbox.doc;
+  let root = doc.documentElement;
+
+  let platform = root.getAttribute("platform");
+  let expectedPlatform = getPlatform();
+  is(platform, expectedPlatform, ":root[platform] is correct");
+
+  let theme = Services.prefs.getCharPref("devtools.theme");
+  let className = "theme-" + theme;
+  ok(root.classList.contains(className),
+     ":root has " + className + " class (current theme)");
+
+  // Convert the xpath result into an array of strings
+  // like `href="{URL}" type="text/css"`
+  let sheetsIterator = doc.evaluate("processing-instruction('xml-stylesheet')",
+                       doc, null, XPathResult.ANY_TYPE, null);
+  let sheetsInDOM = [];
+
+  /* eslint-disable no-cond-assign */
+  let sheet;
+  while (sheet = sheetsIterator.iterateNext()) {
+    sheetsInDOM.push(sheet.data);
+  }
+  /* eslint-enable no-cond-assign */
+
+  let sheetsFromTheme = gDevTools.getThemeDefinition(theme).stylesheets;
+  info("Checking for existence of " + sheetsInDOM.length + " sheets");
+  for (let themeSheet of sheetsFromTheme) {
+    ok(sheetsInDOM.some(s => s.includes(themeSheet)),
+       "There is a stylesheet for " + themeSheet);
+  }
+
+  yield toolbox.destroy();
+});
+
+function getPlatform() {
+  let {OS} = Services.appinfo;
+  if (OS == "WINNT") {
+    return "win";
+  } else if (OS == "Darwin") {
+    return "mac";
+  }
+  return "linux";
+}