diff --git a/js/logger.js b/js/logger.js
index 93a5bb53..5b8040ac 100644
--- a/js/logger.js
+++ b/js/logger.js
@@ -9,11 +9,13 @@
  */
 (function (root, factory) {
 	if (typeof exports === "object") {
-		// add timestamps in front of log messages
-		require("console-stamp")(console, {
-			pattern: "yyyy-mm-dd HH:MM:ss.l",
-			include: ["debug", "log", "info", "warn", "error"]
-		});
+		if (process.env.JEST_WORKER_ID === undefined) {
+			// add timestamps in front of log messages
+			require("console-stamp")(console, {
+				pattern: "yyyy-mm-dd HH:MM:ss.l",
+				include: ["debug", "log", "info", "warn", "error"]
+			});
+		}
 
 		// Node, CommonJS-like
 		module.exports = factory(root.config);
@@ -22,29 +24,46 @@
 		root.Log = factory(root.config);
 	}
 })(this, function (config) {
-	const logLevel = {
-		debug: Function.prototype.bind.call(console.debug, console),
-		log: Function.prototype.bind.call(console.log, console),
-		info: Function.prototype.bind.call(console.info, console),
-		warn: Function.prototype.bind.call(console.warn, console),
-		error: Function.prototype.bind.call(console.error, console),
-		group: Function.prototype.bind.call(console.group, console),
-		groupCollapsed: Function.prototype.bind.call(console.groupCollapsed, console),
-		groupEnd: Function.prototype.bind.call(console.groupEnd, console),
-		time: Function.prototype.bind.call(console.time, console),
-		timeEnd: Function.prototype.bind.call(console.timeEnd, console),
-		timeStamp: Function.prototype.bind.call(console.timeStamp, console)
-	};
+	let logLevel;
+	if (process.env.JEST_WORKER_ID === undefined) {
+		logLevel = {
+			debug: Function.prototype.bind.call(console.debug, console),
+			log: Function.prototype.bind.call(console.log, console),
+			info: Function.prototype.bind.call(console.info, console),
+			warn: Function.prototype.bind.call(console.warn, console),
+			error: Function.prototype.bind.call(console.error, console),
+			group: Function.prototype.bind.call(console.group, console),
+			groupCollapsed: Function.prototype.bind.call(console.groupCollapsed, console),
+			groupEnd: Function.prototype.bind.call(console.groupEnd, console),
+			time: Function.prototype.bind.call(console.time, console),
+			timeEnd: Function.prototype.bind.call(console.timeEnd, console),
+			timeStamp: Function.prototype.bind.call(console.timeStamp, console)
+		};
 
-	logLevel.setLogLevel = function (newLevel) {
-		if (newLevel) {
-			Object.keys(logLevel).forEach(function (key, index) {
-				if (!newLevel.includes(key.toLocaleUpperCase())) {
-					logLevel[key] = function () {};
-				}
-			});
-		}
-	};
+		logLevel.setLogLevel = function (newLevel) {
+			if (newLevel) {
+				Object.keys(logLevel).forEach(function (key, index) {
+					if (!newLevel.includes(key.toLocaleUpperCase())) {
+						logLevel[key] = function () {};
+					}
+				});
+			}
+		};
+	} else {
+		logLevel = {
+			debug: function () {},
+			log: function () {},
+			info: function () {},
+			warn: function () {},
+			error: function () {},
+			group: function () {},
+			groupCollapsed: function () {},
+			groupEnd: function () {},
+			time: function () {},
+			timeEnd: function () {},
+			timeStamp: function () {}
+		};
+	}
 
 	return logLevel;
 });
diff --git a/tests/unit/global_vars/defaults_modules_spec.js b/tests/unit/global_vars/defaults_modules_spec.js
index 03879a86..490a2510 100644
--- a/tests/unit/global_vars/defaults_modules_spec.js
+++ b/tests/unit/global_vars/defaults_modules_spec.js
@@ -1,49 +1,14 @@
 const fs = require("fs");
 const path = require("path");
-const vm = require("vm");
 
-const basedir = path.join(__dirname, "../../..");
+const root_path = path.join(__dirname, "../../..");
 
 describe("Default modules set in modules/default/defaultmodules.js", function () {
-	let sandbox = null;
-
-	beforeAll(function () {
-		const fileName = "js/app.js";
-		const filePath = path.join(basedir, fileName);
-		const code = fs.readFileSync(filePath);
-
-		sandbox = {
-			module: {},
-			__dirname: path.dirname(filePath),
-			global: {},
-			process: {
-				on: function () {},
-				env: {}
-			}
-		};
-
-		sandbox.require = function (filename) {
-			// This modifies the global slightly,
-			// but supplies vm with essential code
-			if (filename === "logger") {
-				return require("../mocks/logger.js");
-			} else {
-				try {
-					return require(filename);
-				} catch (ignore) {
-					// ignore
-				}
-			}
-		};
-
-		vm.runInNewContext(code, sandbox, fileName);
-	});
-
 	const expectedDefaultModules = require("../../../modules/default/defaultmodules");
 
 	for (const defaultModule of expectedDefaultModules) {
 		it(`contains a folder for modules/default/${defaultModule}"`, function () {
-			expect(fs.existsSync(path.join(sandbox.global.root_path, "modules/default", defaultModule))).toBe(true);
+			expect(fs.existsSync(path.join(root_path, "modules/default", defaultModule))).toBe(true);
 		});
 	}
 });
diff --git a/tests/unit/global_vars/root_path_spec.js b/tests/unit/global_vars/root_path_spec.js
index 9dfc3f30..1f86082b 100644
--- a/tests/unit/global_vars/root_path_spec.js
+++ b/tests/unit/global_vars/root_path_spec.js
@@ -1,49 +1,15 @@
 const fs = require("fs");
 const path = require("path");
-const vm = require("vm");
+
+const root_path = path.join(__dirname, "../../..");
+const version = require(`${__dirname}/../../../package.json`).version;
 
 describe("'global.root_path' set in js/app.js", function () {
-	let sandbox = null;
-
-	beforeAll(function () {
-		const basedir = path.join(__dirname, "../../..");
-
-		const fileName = "js/app.js";
-		const filePath = path.join(basedir, fileName);
-		const code = fs.readFileSync(filePath);
-
-		sandbox = {
-			module: {},
-			__dirname: path.dirname(filePath),
-			global: {},
-			process: {
-				on: function () {},
-				env: {}
-			}
-		};
-
-		sandbox.require = function (filename) {
-			// This modifies the global slightly,
-			// but supplies vm with essential code
-			if (filename === "logger") {
-				return require("../mocks/logger.js");
-			} else {
-				try {
-					return require(filename);
-				} catch (ignore) {
-					// ignore
-				}
-			}
-		};
-
-		vm.runInNewContext(code, sandbox, fileName);
-	});
-
 	const expectedSubPaths = ["modules", "serveronly", "js", "js/app.js", "js/main.js", "js/electron.js", "config"];
 
 	expectedSubPaths.forEach((subpath) => {
 		it(`contains a file/folder "${subpath}"`, function () {
-			expect(fs.existsSync(path.join(sandbox.global.root_path, subpath))).toBe(true);
+			expect(fs.existsSync(path.join(root_path, subpath))).toBe(true);
 		});
 	});
 
@@ -57,6 +23,6 @@ describe("'global.root_path' set in js/app.js", function () {
 
 	it("should expect the global.version equals package.json file", function () {
 		const versionPackage = JSON.parse(fs.readFileSync("package.json", "utf8")).version;
-		expect(sandbox.global.version).toBe(versionPackage);
+		expect(version).toBe(versionPackage);
 	});
 });
diff --git a/tests/unit/mocks/logger.js b/tests/unit/mocks/logger.js
deleted file mode 100644
index 56b5b123..00000000
--- a/tests/unit/mocks/logger.js
+++ /dev/null
@@ -1,20 +0,0 @@
-(function (root, factory) {
-	// Node, CommonJS-like
-	module.exports = factory(root.config);
-})(this, function (config) {
-	let logLevel = {
-		debug: function () {},
-		log: function () {},
-		info: function () {},
-		warn: function () {},
-		error: function () {},
-		group: function () {},
-		groupCollapsed: function () {},
-		groupEnd: function () {},
-		time: function () {},
-		timeEnd: function () {},
-		timeStamp: function () {}
-	};
-
-	return logLevel;
-});