diff --git a/packages/core/jest.config.js b/packages/core/jest.config.js
index 678efc9..8606069 100644
--- a/packages/core/jest.config.js
+++ b/packages/core/jest.config.js
@@ -1,5 +1,6 @@
 module.exports = async () => {
     return {
+        setupFilesAfterEnv: ['<rootDir>/setup-tests.js'],
         rootDir: __dirname,
         reporters: ['default', 'jest-summary-reporter'],
         testPathIgnorePatterns: [
diff --git a/packages/core/setup-tests.js b/packages/core/setup-tests.js
new file mode 100644
index 0000000..0ceaa48
--- /dev/null
+++ b/packages/core/setup-tests.js
@@ -0,0 +1,4 @@
+import '@testing-library/jest-dom';
+import { TextEncoder, TextDecoder } from 'util';
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder;
diff --git a/packages/core/test/components/mapper/array.test.js b/packages/core/test/components/mapper/array.test.js
index 38a0214..e4dd1f4 100644
--- a/packages/core/test/components/mapper/array.test.js
+++ b/packages/core/test/components/mapper/array.test.js
@@ -1,7 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import { ArrayComponent } from '../../../src/components/mapper/array';
-import '@testing-library/jest-dom/extend-expect';
-import shortid from 'shortid';
 
 import { SchemaForm, util, constants } from '../../../src';
 import React from 'react';
diff --git a/packages/core/test/components/mapper/checkbox.test.js b/packages/core/test/components/mapper/checkbox.test.js
index 32afb16..100dbd1 100644
--- a/packages/core/test/components/mapper/checkbox.test.js
+++ b/packages/core/test/components/mapper/checkbox.test.js
@@ -1,5 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import '@testing-library/jest-dom/extend-expect';
 import * as barebones from '@forml/decorator-barebones';
 
 import { SchemaForm, getLocalizer, util } from '../../../src';
diff --git a/packages/core/test/components/mapper/date.test.js b/packages/core/test/components/mapper/date.test.js
index 7409894..af26e0e 100644
--- a/packages/core/test/components/mapper/date.test.js
+++ b/packages/core/test/components/mapper/date.test.js
@@ -1,5 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import '@testing-library/jest-dom/extend-expect';
 import { createElement as h } from 'react';
 import { SchemaForm, getLocalizer, util } from '../../../src';
 import * as barebones from '@forml/decorator-barebones';
diff --git a/packages/core/test/components/mapper/fieldset.test.js b/packages/core/test/components/mapper/fieldset.test.js
index 961bd8b..5471e91 100644
--- a/packages/core/test/components/mapper/fieldset.test.js
+++ b/packages/core/test/components/mapper/fieldset.test.js
@@ -1,5 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import '@testing-library/jest-dom/extend-expect';
 import { createElement as h } from 'react';
 import { SchemaForm, getLocalizer, util, decorators } from '../../../src';
 import * as barebones from '@forml/decorator-barebones';
diff --git a/packages/core/test/components/mapper/integer.test.js b/packages/core/test/components/mapper/integer.test.js
index 75cd764..aa91c0d 100644
--- a/packages/core/test/components/mapper/integer.test.js
+++ b/packages/core/test/components/mapper/integer.test.js
@@ -1,5 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import '@testing-library/jest-dom/extend-expect';
 import { createElement as h } from 'react';
 import { SchemaForm, getLocalizer, util } from '../../../src';
 import * as barebones from '@forml/decorator-barebones';
diff --git a/packages/core/test/components/mapper/number.test.js b/packages/core/test/components/mapper/number.test.js
index adae37c..ca2e645 100644
--- a/packages/core/test/components/mapper/number.test.js
+++ b/packages/core/test/components/mapper/number.test.js
@@ -1,5 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import '@testing-library/jest-dom/extend-expect';
 import { createElement as h } from 'react';
 import { SchemaForm, getLocalizer, util } from '../../../src';
 import * as barebones from '@forml/decorator-barebones';
diff --git a/packages/core/test/components/mapper/select.test.js b/packages/core/test/components/mapper/select.test.js
index 7b03912..b30e4c0 100644
--- a/packages/core/test/components/mapper/select.test.js
+++ b/packages/core/test/components/mapper/select.test.js
@@ -1,5 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import '@testing-library/jest-dom/extend-expect';
 import { config } from 'react-transition-group';
 import * as barebones from '@forml/decorator-barebones';
 
diff --git a/packages/core/test/general.test.js b/packages/core/test/general.test.js
index f181b9d..1169481 100644
--- a/packages/core/test/general.test.js
+++ b/packages/core/test/general.test.js
@@ -1,5 +1,4 @@
 import { render, fireEvent, waitFor } from '@testing-library/react';
-import '@testing-library/jest-dom/extend-expect';
 
 import { SchemaForm, getLocalizer, util } from '../src';
 import { createElement as h } from 'react';
diff --git a/packages/decorator-mui/src/__tests__/mui.test.js b/packages/decorator-mui/src/__tests__/mui.test.js
index afe4415..8d4112b 100644
--- a/packages/decorator-mui/src/__tests__/mui.test.js
+++ b/packages/decorator-mui/src/__tests__/mui.test.js
@@ -1,5 +1,3 @@
-import '@testing-library/jest-dom/extend-expect';
-
 import { AdapterMoment } from '@mui/x-date-pickers/AdapterMoment';
 import { LocalizationProvider } from '@mui/x-date-pickers/LocalizationProvider';
 import { render } from '@testing-library/react';