add eslint rule for only tests

eslint.config.js

@@ -4,6 +4,7 @@ import markdown from "@eslint/markdown";
 import json from "@eslint/json";
 import js from "@eslint/js";
 import globals from "globals";
+import noOnlyTests from "eslint-plugin-no-only-tests";
 
 export default [
   {
@@ -39,6 +40,10 @@ export default [
       ...js.configs.recommended.rules,
       // turn this off for Prettier
       "no-irregular-whitespace": "off",
+      "no-only-tests/no-only-tests": "error",
+    },
+    plugins: {
+      "no-only-tests": noOnlyTests,
     },
   },
   {

package.json

@@ -60,6 +60,7 @@
     "@web/test-runner-junit-reporter": "^0.7.1",
     "eslint": "^9.11.1",
     "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-no-only-tests": "^3.3.0",
     "globals": "^15.10.0",
     "http-server": "^14.1.1",
     "husky": "^9.0.11",

src/components/side-nav/side-nav.spec.js

@@ -14,7 +14,7 @@ const ROUTE = "/guides/";
 const HEADING = "Guides";
 const CURRENT_ROUTE = "/guides/getting-started/key-concepts/";
 
-describe.only("Components/Side Nav", () => {
+describe("Components/Side Nav", () => {
   let nav;
   let expectedGuidesContent = [];
   let expectedHeadingsContent = [];