1 files changed, 29 insertions, 0 deletions
diff --git a/devtools/client/jsonview/test/browser_jsonview_theme.js b/devtools/client/jsonview/test/browser_jsonview_theme.js
new file mode 100644
index 0000000000..ab634ce073
--- /dev/null
+++ b/devtools/client/jsonview/test/browser_jsonview_theme.js
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_JSON_URL = URL_ROOT + "valid_json.json";
+
+add_task(async function() {
+  info("Test JSON theme started.");
+
+  const oldPref = Services.prefs.getCharPref("devtools.theme");
+  Services.prefs.setCharPref("devtools.theme", "light");
+
+  await addJsonViewTab(TEST_JSON_URL);
+
+  is(await getTheme(), "theme-light", "The initial theme is light");
+
+  Services.prefs.setCharPref("devtools.theme", "dark");
+  is(await getTheme(), "theme-dark", "Theme changed to dark");
+
+  Services.prefs.setCharPref("devtools.theme", "light");
+  is(await getTheme(), "theme-light", "Theme changed to light");
+
+  Services.prefs.setCharPref("devtools.theme", oldPref);
+});
+
+function getTheme() {
+  return getElementAttr(":root", "class");
+}