diff --git a/dev/database-vm.js b/dev/database-vm.js
index b682bca3..014c989f 100644
--- a/dev/database-vm.js
+++ b/dev/database-vm.js
@@ -101,8 +101,8 @@ function atob(data) {
 }
 
 class DatabaseVM extends VM {
-    constructor() {
-        super({
+    constructor(globals={}) {
+        super(Object.assign({
             chrome,
             Image,
             Blob,
@@ -111,7 +111,7 @@ class DatabaseVM extends VM {
             IDBKeyRange: global.IDBKeyRange,
             JSZip,
             atob
-        });
+        }, globals));
         this.context.window = this.context;
         this.indexedDB = global.indexedDB;
     }
diff --git a/dev/translator-vm.js b/dev/translator-vm.js
index f68b25db..7eab47b8 100644
--- a/dev/translator-vm.js
+++ b/dev/translator-vm.js
@@ -26,8 +26,8 @@ function clone(value) {
 }
 
 class TranslatorVM extends DatabaseVM {
-    constructor() {
-        super();
+    constructor(globals) {
+        super(globals);
         this._japaneseUtil = null;
         this._translator = null;
         this._ankiNoteDataCreator = null;
diff --git a/test/test-anki-note-builder.js b/test/test-anki-note-builder.js
index aad12aba..d3ea0b6a 100644
--- a/test/test-anki-note-builder.js
+++ b/test/test-anki-note-builder.js
@@ -18,6 +18,7 @@
 const fs = require('fs');
 const path = require('path');
 const assert = require('assert');
+const {JSDOM} = require('jsdom');
 const {testMain} = require('../dev/util');
 const {TranslatorVM} = require('../dev/translator-vm');
 
@@ -27,7 +28,10 @@ function clone(value) {
 }
 
 async function createVM() {
-    const vm = new TranslatorVM();
+    const dom = new JSDOM();
+    const {document} = dom.window;
+
+    const vm = new TranslatorVM({document});
 
     const dictionaryDirectory = path.join(__dirname, 'data', 'dictionaries', 'valid-dictionary1');
     await vm.prepare(dictionaryDirectory, 'Test Dictionary 2');
@@ -68,6 +72,25 @@ async function createVM() {
             return this._serializeMulti(this._templateRenderer.renderMulti(items));
         }
 
+        _serializeError(error) {
+            try {
+                if (typeof error === 'object' && error !== null) {
+                    return {
+                        name: error.name,
+                        message: error.message,
+                        stack: error.stack,
+                        data: error.data
+                    };
+                }
+            } catch (e) {
+                // NOP
+            }
+            return {
+                value: error,
+                hasValue: true
+            };
+        }
+
         _serializeMulti(array) {
             for (let i = 0, ii = array.length; i < ii; ++i) {
                 const value = array[i];