diff --git a/package.json b/package.json
index 5a028e7ac..82c30637a 100644
--- a/package.json
+++ b/package.json
@@ -33,10 +33,10 @@
   "scripts": {
     "test-node": "mocha --recursive -R dot \"test/**/*-test.js\"",
     "test-dev": "npm run test-node --  -n watch -n  watch-path=test --node-option watch-path=lib -R min",
-    "test-headless": "mochify   --driver puppeteer  --no-detect-globals --recursive -R dot --grep WebWorker --invert  \"test/**/*-test.js\"",
+    "test-headless": "mochify --driver puppeteer",
     "test-coverage": "nyc npm run test-headless -- --transform [ babelify --ignore [ test ] --plugins [ babel-plugin-istanbul ] ]",
     "test-cloud": "npm run test-headless -- --wd",
-    "test-webworker": "mochify  --driver puppeteer  --no-detect-globals --https-server 0 --no-request-interception test/webworker/webworker-support-assessment.js",
+    "test-webworker": "mochify --driver puppeteer --serve . test/webworker/webworker-support-assessment.js",
     "test-esm-support": "mocha test/es2015/module-support-assessment-test.mjs",
     "test-esm-browser-build": "node test/es2015/check-esm-bundle-is-runnable.js",
     "test-docker-image": "docker-compose up",
@@ -76,7 +76,7 @@
   "mochify": {
     "reporter": "dot",
     "timeout": 10000,
-    "bundle": "esbuild --bundle --sourcemap=inline --define:process.env.NODE_DEBUG=\"\"",
+    "bundle": "esbuild --bundle --sourcemap=inline --define:process.env.NODE_DEBUG=\"\" --external:fs",
     "bundle_stdin": "require",
     "spec": "test/**/*-test.js"
   },
diff --git a/test/issues/issues-test.js b/test/issues/issues-test.js
index 8f6239acc..6d17593e7 100644
--- a/test/issues/issues-test.js
+++ b/test/issues/issues-test.js
@@ -43,7 +43,9 @@ describe("issues", function () {
     describe("#458", function () {
         describe("on node", function () {
             beforeEach(function () {
-                if (typeof require("fs").readFileSync !== "function") {
+                try {
+                    require("fs");
+                } catch (_) {
                     this.skip();
                 }
             });