diff --git a/tests/unit/global_vars/root_path_spec.js b/tests/unit/global_vars/root_path_spec.js
index f21d3e44..3da29be1 100644
--- a/tests/unit/global_vars/root_path_spec.js
+++ b/tests/unit/global_vars/root_path_spec.js
@@ -2,10 +2,42 @@ var fs = require("fs");
 var path = require("path");
 var chai = require("chai");
 var expect = chai.expect;
+var vm = require("vm");
+
+before(function() {
+	var basedir = path.join(__dirname, "../../..");
+
+	var fileName = "js/app.js";
+	var filePath = path.join(basedir, fileName);
+	var code = fs.readFileSync(filePath);
+
+	this.sandbox = {
+		module: {},
+		__dirname: path.dirname(filePath),
+		global: {},
+		console: {
+			log: function() { /*console.log("console.log(", arguments, ")");*/ }
+		},
+		process: {
+			on: function() { /*console.log("process.on called with: ", arguments);*/ },
+			env: {}
+		}
+	};
+
+	this.sandbox.require = function(filename) {
+		// This modifies the global slightly,
+		// but supplies vm with essential code
+		return require(filename);
+	};
+
+	vm.runInNewContext(code, this.sandbox, fileName);
+});
+
+after(function() {
+	//console.log(global);
+});
 
 describe("'global.root_path' set in js/app.js", function() {
-	var appMM =  require("../../../js/app.js")
-
 	var expectedSubPaths = [
 		"modules",
 		"serveronly",
@@ -18,8 +50,16 @@ describe("'global.root_path' set in js/app.js", function() {
 
 	expectedSubPaths.forEach(subpath => {
 		it(`contains a file/folder "${subpath}"`, function() {
-			expect(fs.existsSync(path.join(global.root_path, subpath))).to.equal(true);
+			expect(fs.existsSync(path.join(this.sandbox.global.root_path, subpath))).to.equal(true);
 		});
 	});
+
+	it("should not modify global.root_path for testing", function() {
+		expect(global.root_path).to.equal(undefined);
+	});
+
+	it("should not modify global.version for testing", function() {
+		expect(global.version).to.equal(undefined);
+	});
 });
 
diff --git a/tests/unit/translations/same_keys.js b/tests/unit/translations/same_keys.js
new file mode 100644
index 00000000..67ed7170
--- /dev/null
+++ b/tests/unit/translations/same_keys.js
@@ -0,0 +1,115 @@
+var fs = require("fs");
+var path = require("path");
+var chai = require("chai");
+var expect = chai.expect;
+
+describe("Translations have the same keys as en.js", function() {
+	var translations = require("../../../translations/translations.js");
+	var base = JSON.parse(stripComments(fs.readFileSync("translations/en.json", "utf8")));
+	var baseKeys = Object.keys(base).sort();
+
+	Object.keys(translations).forEach(function(tr) {
+		var fileName = translations[tr];
+		var fileContent = stripComments(fs.readFileSync(fileName, "utf8"));
+		var fileTranslations = JSON.parse(fileContent);
+		var fileKeys = Object.keys(fileTranslations).sort();
+
+		it(fileName + " keys should be in base", function() {
+			fileKeys.forEach(function(key) {
+				expect( baseKeys.indexOf(key) ).to.be.at.least(0);
+			});
+		});
+
+		it(fileName + " should contain all base keys", function() {
+			var test = this;
+			baseKeys.forEach(function(key) {
+				// TODO: when all translations are fixed, use
+				// expect(fileKeys).to.deep.equal(baseKeys);
+				// instead of the try-catch-block
+
+				try {
+					expect(fileKeys).to.deep.equal(baseKeys);
+				} catch(e) {
+					if (e instanceof chai.AssertionError) {
+						test.skip();
+					} else {
+						throw e;
+					}
+				}
+			});
+		});
+	});
+});
+
+// Copied from js/translator.js
+function stripComments(str, opts) {
+	// strip comments copied from: https://github.com/sindresorhus/strip-json-comments
+
+	var singleComment = 1;
+	var multiComment = 2;
+
+	function stripWithoutWhitespace() {
+		return "";
+	}
+
+	function stripWithWhitespace(str, start, end) {
+		return str.slice(start, end).replace(/\S/g, " ");
+	}
+
+	opts = opts || {};
+
+	var currentChar;
+	var nextChar;
+	var insideString = false;
+	var insideComment = false;
+	var offset = 0;
+	var ret = "";
+	var strip = opts.whitespace === false ? stripWithoutWhitespace : stripWithWhitespace;
+
+	for (var i = 0; i < str.length; i++) {
+		currentChar = str[i];
+		nextChar = str[i + 1];
+
+		if (!insideComment && currentChar === "\"") {
+			var escaped = str[i - 1] === "\\" && str[i - 2] !== "\\";
+			if (!escaped) {
+				insideString = !insideString;
+			}
+		}
+
+		if (insideString) {
+			continue;
+		}
+
+		if (!insideComment && currentChar + nextChar === "//") {
+			ret += str.slice(offset, i);
+			offset = i;
+			insideComment = singleComment;
+			i++;
+		} else if (insideComment === singleComment && currentChar + nextChar === "\r\n") {
+			i++;
+			insideComment = false;
+			ret += strip(str, offset, i);
+			offset = i;
+			continue;
+		} else if (insideComment === singleComment && currentChar === "\n") {
+			insideComment = false;
+			ret += strip(str, offset, i);
+			offset = i;
+		} else if (!insideComment && currentChar + nextChar === "/*") {
+			ret += str.slice(offset, i);
+			offset = i;
+			insideComment = multiComment;
+			i++;
+			continue;
+		} else if (insideComment === multiComment && currentChar + nextChar === "*/") {
+			i++;
+			insideComment = false;
+			ret += strip(str, offset, i + 1);
+			offset = i + 1;
+			continue;
+		}
+	}
+
+	return ret + (insideComment ? strip(str.substr(offset)) : str.substr(offset));
+}
diff --git a/translations/translations.js b/translations/translations.js
index c10da418..d28e9713 100644
--- a/translations/translations.js
+++ b/translations/translations.js
@@ -31,3 +31,5 @@ var translations = {
 	"hu" : "translations/hu.json", // Hungarian
 	"is" : "translations/is.json", // Icelandic
 };
+
+if (typeof module !== "undefined") {module.exports = translations;}