diff --git a/samples/self-hosted/main.js b/samples/self-hosted/main.js
index d9320f7..01924db 100644
--- a/samples/self-hosted/main.js
+++ b/samples/self-hosted/main.js
@@ -1,6 +1,6 @@
 let wordpos = window.wordpos = new WordPOS({
   // preload: true,
-  dictPath: '../samples/self-hosted/dict',
+  dictPath: '/samples/self-hosted/dict',
   profile: true,
   // stopwords: false
 });
diff --git a/src/browser/baseFile.js b/src/browser/baseFile.js
index 156d570..3903f32 100644
--- a/src/browser/baseFile.js
+++ b/src/browser/baseFile.js
@@ -7,6 +7,8 @@
  * Released under MIT license
  */
 
+let isTest = window.__mocha;
+
 class BaseFile {
 
   /**
@@ -33,11 +35,13 @@ class BaseFile {
 
   load() {
     if (this.loadError) return Promise.reject(this.loadError);
-
     this.options.debug && console.time('index load ' + this.posName);
-    let promise = Promise.resolve(require(this.filePath));
-    this.options.debug && console.timeEnd('index load ' + this.posName)
 
+    let promise = isTest
+      ? Promise.resolve(require(this.filePath))
+      : eval(`import('${this.filePath}')`); // prevent parcel from clobbering dynamic import
+
+    this.options.debug && console.timeEnd('index load ' + this.posName)
     return promise
       .then(exports => {
         this.file = exports.default
diff --git a/test/wordpos_test.js b/test/wordpos_test.js
index 2efd10f..21be423 100644
--- a/test/wordpos_test.js
+++ b/test/wordpos_test.js
@@ -17,6 +17,10 @@
  * Released under MIT license
  */
 
+ // used in src code to signal test mode
+global.window = global.window || {};
+global.window.__mocha = true;
+
 var
   chai = require('chai'),
   _ = require('underscore'),
@@ -31,6 +35,7 @@ var
     // debug: true
   });
 
+
 const assertNoData = (err) => {
   assert(err instanceof RangeError);
   assert(/No data at offset/.test(err.message));