diff --git a/test/JavaScriptObfuscator.spec.ts b/test/JavaScriptObfuscator.spec.ts
index 0e46ee02..fdb5a288 100644
--- a/test/JavaScriptObfuscator.spec.ts
+++ b/test/JavaScriptObfuscator.spec.ts
@@ -1,13 +1,9 @@
-import { BabelPolyfill } from './polyfills/BabelPolyfill';
-
 import { JavaScriptObfuscator } from "../src/JavaScriptObfuscator";
 
 import { NO_CUSTOM_NODES_PRESET } from "../src/preset-options/NoCustomNodesPreset";
 
 const assert: Chai.AssertStatic = require('chai').assert;
 
-BabelPolyfill.append();
-
 describe('JavaScriptObfuscator', () => {
     describe('obfuscate (sourceCode: string, customOptions?: IOptionsPreset): string', () => {
         it('should obfuscate simple code with variable inside global scope', () => {
diff --git a/test/JavaScriptObfuscatorCLI.spec.ts b/test/JavaScriptObfuscatorCLI.spec.ts
index fb1277ca..9b455c07 100644
--- a/test/JavaScriptObfuscatorCLI.spec.ts
+++ b/test/JavaScriptObfuscatorCLI.spec.ts
@@ -2,16 +2,12 @@ import * as fs from 'fs';
 import * as mkdirp from 'mkdirp';
 import * as sinon from 'sinon';
 
-import { BabelPolyfill } from './polyfills/BabelPolyfill';
-
 import { StdoutWriteMock } from "../test/mocks/StdoutWriteMock";
 
 import { JavaScriptObfuscator } from "../src/JavaScriptObfuscator";
 
 const assert: Chai.AssertStatic = require('chai').assert;
 
-BabelPolyfill.append();
-
 describe('JavaScriptObfuscatorCLI', function (): void {
     let fixturesDirName: string = 'test/fixtures',
         fixtureFileName: string = 'sample.js',
diff --git a/test/NodeUtils.spec.ts b/test/NodeUtils.spec.ts
index dcf68f40..f1f54ea7 100644
--- a/test/NodeUtils.spec.ts
+++ b/test/NodeUtils.spec.ts
@@ -1,5 +1,3 @@
-import { BabelPolyfill } from './polyfills/BabelPolyfill';
-
 import { IBlockStatementNode } from "../src/interfaces/nodes/IBlockStatementNode";
 import { IFunctionDeclarationNode } from "../src/interfaces/nodes/IFunctionDeclarationNode";
 import { IIdentifierNode } from "../src/interfaces/nodes/IIdentifierNode";
@@ -14,8 +12,6 @@ import { NodeUtils } from '../src/NodeUtils';
 
 const assert: any = require('chai').assert;
 
-BabelPolyfill.append();
-
 function getProgramNode (bodyNodes: INode[] = []): IProgramNode {
     return {
         type: NodeType.Program,
diff --git a/test/OptionsNormalizer.spec.ts b/test/OptionsNormalizer.spec.ts
index 595ee3d4..92c0ecae 100644
--- a/test/OptionsNormalizer.spec.ts
+++ b/test/OptionsNormalizer.spec.ts
@@ -1,5 +1,3 @@
-import { BabelPolyfill } from './polyfills/BabelPolyfill';
-
 import { IOptionsPreset } from "../src/interfaces/IOptionsPreset";
 
 import { OptionsNormalizer } from '../src/OptionsNormalizer';
@@ -8,8 +6,6 @@ import { DEFAULT_PRESET } from '../src/preset-options/DefaultPreset';
 
 const assert: Chai.AssertStatic = require('chai').assert;
 
-BabelPolyfill.append();
-
 describe('OptionsNormalizer', () => {
     describe('normalizeOptionsPreset (options: IOptionsPreset): IOptionsPreset', () => {
         let optionsPreset1: IOptionsPreset = Object.assign({}, DEFAULT_PRESET, {
diff --git a/test/Utils.spec.ts b/test/Utils.spec.ts
index 8844fb05..4b182c43 100644
--- a/test/Utils.spec.ts
+++ b/test/Utils.spec.ts
@@ -1,13 +1,9 @@
-import { BabelPolyfill } from './polyfills/BabelPolyfill';
-
 import { Utils } from '../src/Utils';
 
 import { JSFuck } from '../src/enums/JSFuck';
 
 const assert: Chai.AssertStatic = require('chai').assert;
 
-BabelPolyfill.append();
-
 describe('Utils', () => {
     describe('arrayContains (array: any[], searchElement: any): boolean', () => {
         it('should return boolean depends on condition if array is contains given value or not', () => {
diff --git a/test/config/setup.spec.ts b/test/config/setup.spec.ts
new file mode 100644
index 00000000..27da39e8
--- /dev/null
+++ b/test/config/setup.spec.ts
@@ -0,0 +1,5 @@
+import { BabelPolyfill } from '../polyfills/BabelPolyfill';
+
+before(() => {
+    BabelPolyfill.append();
+});