1 files changed, 55 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_themes_validation.js b/browser/components/extensions/test/browser/browser_ext_themes_validation.js
new file mode 100644
index 0000000000..c004363a6b
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_themes_validation.js
@@ -0,0 +1,55 @@
+"use strict";
+
+PromiseTestUtils.allowMatchingRejectionsGlobally(/packaging errors/);
+
+/**
+ * Helper function for testing a theme with invalid properties.
+ *
+ * @param {object} invalidProps The invalid properties to load the theme with.
+ */
+async function testThemeWithInvalidProperties(invalidProps) {
+  let manifest = {
+    theme: {},
+  };
+
+  invalidProps.forEach(prop => {
+    // Some properties require additional information:
+    switch (prop) {
+      case "background":
+        manifest[prop] = { scripts: ["background.js"] };
+        break;
+      case "permissions":
+        manifest[prop] = ["tabs"];
+        break;
+      case "omnibox":
+        manifest[prop] = { keyword: "test" };
+        break;
+      default:
+        manifest[prop] = {};
+    }
+  });
+
+  let extension = ExtensionTestUtils.loadExtension({ manifest });
+  await Assert.rejects(
+    extension.startup(),
+    /startup failed/,
+    "Theme should fail to load if it contains invalid properties"
+  );
+}
+
+add_task(
+  async function test_that_theme_with_invalid_properties_fails_to_load() {
+    let invalidProps = [
+      "page_action",
+      "browser_action",
+      "background",
+      "permissions",
+      "omnibox",
+      "commands",
+    ];
+    for (let prop in invalidProps) {
+      await testThemeWithInvalidProperties([prop]);
+    }
+    await testThemeWithInvalidProperties(invalidProps);
+  }
+);