test: let test:only take file arguments without losing the e2e exclusion

--testPathIgnorePatterns is variadic, so a positional file after
`npm run test:only --` was consumed as another ignore pattern — silently
excluding the very file being targeted (the = form appends all the
same). The exclusion now lives in jest.config.js and lifts itself when a
test/e2e path is requested explicitly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: bjohansebas

jest.config.js

@@ -1,9 +1,16 @@
+// The browser e2e suites run serially through `npm run test:e2e` — excluded
+// here so the regular run stays parallel. The ignore lifts itself when a
+// test/e2e path is requested explicitly (a CLI flag would swallow positional
+// file arguments, --testPathIgnorePatterns being variadic).
+const runningE2E = process.argv.some((arg) => arg.includes("test/e2e"));
+
 module.exports = {
   testEnvironment: "node",
   collectCoverage: false,
   coveragePathIgnorePatterns: ["test", "<rootDir>/node_modules"],
   moduleFileExtensions: ["js", "json"],
   testMatch: ["**/test/**/*.test.js"],
+  testPathIgnorePatterns: runningE2E ? [] : ["/node_modules/", "/test/e2e/"],
   setupFilesAfterEnv: ["<rootDir>/setupTest.js"],
   globalSetup: "./test/helpers/globalSetup.js",
   snapshotResolver: "./test/helpers/snapshotResolver.js",

package.json

@@ -49,7 +49,7 @@
     "build:code": "babel src -d dist --copy-files",
     "build:client": "babel client-src -d client --copy-files",
     "build": "npm-run-all -p \"build:**\"",
-    "test:only": "node --experimental-vm-modules ./node_modules/jest-cli/bin/jest --testPathIgnorePatterns \"/test/e2e/\"",
+    "test:only": "node --experimental-vm-modules ./node_modules/jest-cli/bin/jest",
     "test:e2e": "node --experimental-vm-modules ./node_modules/jest-cli/bin/jest test/e2e --runInBand",
     "test:watch": "npm run test:only -- --watch",
     "test:coverage": "npm run test:only -- --collectCoverageFrom=\"src/**/*.js\" --coverage",