Dedupe some npm scripts

Thanks to the unfolding placeholder in npm-run-all2 6.2.0:  bcomnes/npm-run-all2#134

package.json

@@ -48,17 +48,15 @@
     "format:eslint": "eslint --fix . 'bin/*'",
     "format:prettier": "prettier --write '!(package*).json' '.*.json' 'lib/**/*.json' '*.yml'",
     "format": "run-s format:*",
+    "helper:cross-env": "cross-env",
+    "helper:test-browser": "karma start ./karma.conf.js --single-run --colors",
     "lint:code": "eslint . 'bin/*' --max-warnings 0",
     "lint:markdown": "markdownlint '*.md' 'docs/**/*.md' '.github/*.md' 'lib/**/*.md' 'test/**/*.md' 'example/**/*.md'",
     "lint": "run-p lint:*",
     "prepublishOnly": "nps test clean build",
-    "test-browser-unit": "cross-env NODE_PATH=. karma start ./karma.conf.js --single-run --colors",
     "test-smoke": "node ./bin/mocha --no-config test/smoke/smoke.spec.js",
-    "test:0-node": "rimraf .nyc_output && run-s clean build && nps testNode",
-    "test:1-browser:bdd": "cross-env MOCHA_TEST=bdd run-s test-browser-unit",
-    "test:1-browser:esm": "cross-env MOCHA_TEST=esm run-s test-browser-unit",
-    "test:1-browser:qunit": "cross-env MOCHA_TEST=qunit run-s test-browser-unit",
-    "test:1-browser:tdd": "cross-env MOCHA_TEST=tdd run-s test-browser-unit",
+    "test:0-node": "rimraf .nyc_output && run-s clean && nps testNode",
+    "test:1-browser:reporters": "run-s 'helper:cross-env NODE_PATH=. MOCHA_TEST={%} run-s helper:test-browser' -- bdd esm qunit tdd",
     "test:1-browser:webpack-compat": "webpack --mode development --config ./test/browser-specific/fixtures/webpack/webpack.config.js",
     "test:1-browser": "run-s clean build test:1-browser:*",
     "test": "run-s lint test:*",