diff --git a/package-lock.json b/package-lock.json
index e6202fb..b1eb16e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2821,6 +2821,12 @@
         }
       }
     },
+    "get-caller-file": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+      "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+      "dev": true
+    },
     "jest": {
       "version": "25.5.4",
       "resolved": "https://registry.npmjs.org/jest/-/jest-25.5.4.tgz",
@@ -7618,6 +7624,25 @@
       "integrity": "sha512-Gp3tETlN6uZftc1Jnv1sogQd8uB2Xh4c5bQ18qKR6KOMfUlsS8vztrC1vDrZS8eg4MuwE1AgZEcwxI41BSW6oQ==",
       "dev": true
     },
+    "mock-require": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/mock-require/-/mock-require-3.0.3.tgz",
+      "integrity": "sha512-lLzfLHcyc10MKQnNUCv7dMcoY/2Qxd6wJfbqCcVk3LDb8An4hF6ohk5AztrvgKhJCqj36uyzi/p5se+tvyD+Wg==",
+      "dev": true,
+      "requires": {
+        "get-caller-file": "^1.0.2",
+        "normalize-path": "^2.1.1"
+      }
+    },
+    "normalize-path": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
+      "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+      "dev": true,
+      "requires": {
+        "remove-trailing-separator": "^1.0.1"
+      }
+    },
     "pathseg": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/pathseg/-/pathseg-1.2.0.tgz",
@@ -8080,6 +8105,12 @@
         }
       }
     },
+    "remove-trailing-separator": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
+      "integrity": "sha1-wkvOKig62tW8P1jg1IJJuSN52O8=",
+      "dev": true
+    },
     "webpack": {
       "version": "4.46.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.46.0.tgz",
diff --git a/package.json b/package.json
index 20df457..3d49a3c 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "json-stringify-pretty-compact": "^2.0.0",
     "matter-tools": "^0.12.3",
     "matter-wrap": "^0.2.0",
+    "mock-require": "^3.0.3",
     "pathseg": "^1.2.0",
     "poly-decomp": "^0.3.0",
     "puppeteer-core": "^5.5.0",
diff --git a/test/ExampleWorker.js b/test/ExampleWorker.js
index 0f75998..ba13118 100644
--- a/test/ExampleWorker.js
+++ b/test/ExampleWorker.js
@@ -4,7 +4,6 @@
 
 const stubBrowserFeatures = M => {
   const noop = () => ({ collisionFilter: {}, mouse: {} });
-  M.Common._requireGlobal = name => global[name];
   M.Render.create = () => ({ options: {}, bounds: { min: { x: 0, y: 0 }, max: { x: 800, y: 600 }}});
   M.Render.run = M.Render.lookAt = noop;
   M.Runner.create = M.Runner.run = noop;
@@ -20,6 +19,7 @@ const reset = M => {
   M.Body._nextCategory = 0x0001;
 };
 
+const mock = require('mock-require');
 const { engineCapture } = require('./TestTools');
 const MatterDev = stubBrowserFeatures(require('../src/module/main'));
 const MatterBuild = stubBrowserFeatures(require('../build/matter'));
@@ -30,8 +30,10 @@ const runExample = options => {
   const consoleOriginal = global.console;
   const logs = [];
 
-  global.document = global.window = { addEventListener: () => {} };
+  mock('matter-js', Matter);
   global.Matter = Matter;
+
+  global.document = global.window = { addEventListener: () => {} };
   global.console = { 
     log: (...args) => {
       logs.push(args.join(' '));
@@ -83,6 +85,7 @@ const runExample = options => {
   global.window = undefined;
   global.document = undefined;
   global.Matter = undefined;
+  mock.stopAll();
 
   return {
     name: options.name,