diff --git a/.eslintrc.js b/.eslintrc.js
index 01c4d51..5a75f4c 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -2,6 +2,7 @@ module.exports = {
     'env': {
         'browser': true,
         'es6': true,
+        'jest/globals': true,
     },
     'parserOptions': {
         'ecmaVersion': 2018,
@@ -9,8 +10,10 @@ module.exports = {
     },
     'plugins': [
         'import',
+        'jest',
     ],
     'extends': [
         '@nepada',
+        'plugin:jest/recommended',
     ],
 };
diff --git a/.travis.yml b/.travis.yml
index b0f0912..724fff8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,8 @@ jobs:
           install:
               - travis_retry npm install
           script:
+              - npm run lint
+              - npm run build
               - npm run test
         -   stage: Code Standard Checker
             php: 7.4
diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..23821a0
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,12 @@
+module.exports = {
+    'presets': [
+        [
+            '@babel/preset-env',
+            {
+                'targets': {
+                    'node': 'current',
+                },
+            },
+        ],
+    ],
+};
diff --git a/package.json b/package.json
index 1ee236a..3c38016 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,8 @@
         "@rollup/plugin-node-resolve": "^6.0.0",
         "eslint": "^6.8.0",
         "eslint-plugin-import": "^2.19.1",
+        "eslint-plugin-jest": "^23.8.2",
+        "jest": "^24.9.0",
         "rollup": "^1.27.14",
         "rollup-plugin-babel": "^4.3.3",
         "rollup-plugin-node-builtins": "^2.1.2",
@@ -46,8 +48,8 @@
         "dist"
     ],
     "scripts": {
-        "lint": "eslint src/assets build",
-        "test": "npm run lint",
+        "lint": "eslint src/assets build tests/*.js tests/assets",
+        "test": "jest --config tests/jest.config.js tests/assets/**.test.js",
         "clean": "rm -rf ./dist/*",
         "build:cjs": "rollup --config build/rollup.config.cjs.js",
         "build:umd": "rollup --config build/rollup.config.umd.js",
diff --git a/tests/assets/binding.test.js b/tests/assets/binding.test.js
new file mode 100644
index 0000000..9e292d5
--- /dev/null
+++ b/tests/assets/binding.test.js
@@ -0,0 +1,33 @@
+import {testInstances} from './bootstrap';
+
+describe.each(testInstances)('%s', (name1, Nette1) => {
+    describe.each(testInstances)('%s', (name2, Nette2) => {
+        if (name1 === name2) {
+            return;
+        }
+
+        test('getPhoneNumber', () => {
+            expect(Nette1.getPhoneNumber).toBeDefined();
+            expect(Nette1.getPhoneNumber)
+                .not.toBe(Nette2.getPhoneNumber);
+        });
+
+        test('validatePhoneNumber', () => {
+            expect(Nette1.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber).toBeDefined();
+            expect(Nette1.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber)
+                .not.toBe(Nette2.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber);
+        });
+
+        test('validatePhoneNumberStrict', () => {
+            expect(Nette1.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict).toBeDefined();
+            expect(Nette1.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict)
+                .not.toBe(Nette2.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict);
+        });
+
+        test('validatePhoneNumberRegion', () => {
+            expect(Nette1.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion).toBeDefined();
+            expect(Nette1.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion)
+                .not.toBe(Nette2.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion);
+        });
+    });
+});
diff --git a/tests/assets/bootstrap.cjs.js b/tests/assets/bootstrap.cjs.js
new file mode 100644
index 0000000..06ac59f
--- /dev/null
+++ b/tests/assets/bootstrap.cjs.js
@@ -0,0 +1,8 @@
+import metadata from 'libphonenumber-js/metadata.full';
+import init from '../../dist/commonjs/index.cjs';
+import NetteFactory from './netteFactory';
+
+const Nette = NetteFactory();
+init(Nette, metadata);
+
+export default Nette;
diff --git a/tests/assets/bootstrap.esm.js b/tests/assets/bootstrap.esm.js
new file mode 100644
index 0000000..1dffcc3
--- /dev/null
+++ b/tests/assets/bootstrap.esm.js
@@ -0,0 +1,8 @@
+import metadata from 'libphonenumber-js/metadata.full';
+import init from '../../src/assets/index.esm';
+import NetteFactory from './netteFactory';
+
+const Nette = NetteFactory();
+init(Nette, metadata);
+
+export default Nette;
diff --git a/tests/assets/bootstrap.js b/tests/assets/bootstrap.js
new file mode 100644
index 0000000..a540af8
--- /dev/null
+++ b/tests/assets/bootstrap.js
@@ -0,0 +1,11 @@
+import NetteCjs from './bootstrap.cjs';
+import NetteEsm from './bootstrap.esm';
+import NetteUmd from './bootstrap.umd';
+
+const testInstances = [
+    ['src/assets/index.esm.js', NetteEsm],
+    ['dist/commonjs/index.cjs.js', NetteCjs],
+    ['dist/phone-number-input.js', NetteUmd],
+];
+
+export {testInstances};
diff --git a/tests/assets/bootstrap.umd.js b/tests/assets/bootstrap.umd.js
new file mode 100644
index 0000000..c349e08
--- /dev/null
+++ b/tests/assets/bootstrap.umd.js
@@ -0,0 +1,4 @@
+import '../../dist/phone-number-input';
+import NetteFactory from './netteFactory';
+
+export default NetteFactory();
diff --git a/tests/assets/getPhoneNumber.test.js b/tests/assets/getPhoneNumber.test.js
new file mode 100644
index 0000000..5d82177
--- /dev/null
+++ b/tests/assets/getPhoneNumber.test.js
@@ -0,0 +1,60 @@
+import {testInstances} from './bootstrap';
+
+describe.each(testInstances)('%s', (name, Nette) => {
+    test('no default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+        let phoneNumber;
+
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber).toBeNull();
+
+        input.value = 'abcdef';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber).toBeNull();
+
+        input.value = '800 12 34 56';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber).toBeNull();
+
+        input.value = '+420 800 12 34 56';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber.country).toBe('CZ');
+        expect(phoneNumber.number).toBe('+420800123456');
+
+        input.value = '+421 800 12 34 56';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber.country).toBe('SK');
+        expect(phoneNumber.number).toBe('+421800123456');
+    });
+
+    test('CZ default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone" data-default-region-code="CZ"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+        let phoneNumber;
+
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber).toBeNull();
+
+        input.value = 'abcdef';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber).toBeNull();
+
+        input.value = '800 12 34 56';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber.country).toBe('CZ');
+        expect(phoneNumber.number).toBe('+420800123456');
+
+        input.value = '+420 800 12 34 56';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber.country).toBe('CZ');
+        expect(phoneNumber.number).toBe('+420800123456');
+
+        input.value = '+421 800 12 34 56';
+        phoneNumber = Nette.getPhoneNumber(input);
+        expect(phoneNumber.country).toBe('SK');
+        expect(phoneNumber.number).toBe('+421800123456');
+    });
+});
diff --git a/tests/assets/netteFactory.js b/tests/assets/netteFactory.js
new file mode 100644
index 0000000..5d0609e
--- /dev/null
+++ b/tests/assets/netteFactory.js
@@ -0,0 +1,7 @@
+import Nette from 'nette-forms';
+
+export default () => {
+    const clone = Object.assign({}, Nette);
+    clone.validators = Object.assign({}, clone.validators);
+    return clone;
+};
diff --git a/tests/assets/validatePhoneNumer.test.js b/tests/assets/validatePhoneNumer.test.js
new file mode 100644
index 0000000..3ca54aa
--- /dev/null
+++ b/tests/assets/validatePhoneNumer.test.js
@@ -0,0 +1,49 @@
+import {testInstances} from './bootstrap';
+
+describe.each(testInstances)('%s', (name, Nette) => {
+    test('no default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(false);
+
+        input.value = 'abcdef';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(false);
+
+        input.value = '+42012';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(false);
+
+        input.value = '212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(false);
+
+        input.value = '+420 212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(true);
+
+        input.value = '+420111111111';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(true);
+    });
+
+    test('CZ default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone" data-default-region-code="CZ"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(false);
+
+        input.value = 'abcdef';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(false);
+
+        input.value = '+42012';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(false);
+
+        input.value = '212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(true);
+
+        input.value = '+420 212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(true);
+
+        input.value = '+420111111111';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumber(input)).toBe(true);
+    });
+});
diff --git a/tests/assets/validatePhoneNumerRegion.test.js b/tests/assets/validatePhoneNumerRegion.test.js
new file mode 100644
index 0000000..88450e1
--- /dev/null
+++ b/tests/assets/validatePhoneNumerRegion.test.js
@@ -0,0 +1,49 @@
+import {testInstances} from './bootstrap';
+
+describe.each(testInstances)('%s', (name, Nette) => {
+    test('no default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(false);
+
+        input.value = 'abcdef';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(false);
+
+        input.value = '212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'CZ'])).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'SK')).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'SK'])).toBe(false);
+
+        input.value = '+421111111111';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'CZ'])).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'SK')).toBe(true);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'SK'])).toBe(true);
+    });
+
+    test('CZ default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone" data-default-region-code="CZ"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(false);
+
+        input.value = 'abcdef';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(false);
+
+        input.value = '212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(true);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'CZ'])).toBe(true);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'SK')).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'SK'])).toBe(false);
+
+        input.value = '+421111111111';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'CZ')).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'CZ'])).toBe(false);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, 'SK')).toBe(true);
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberRegion(input, ['US', 'SK'])).toBe(true);
+    });
+});
diff --git a/tests/assets/validatePhoneNumerStrict.test.js b/tests/assets/validatePhoneNumerStrict.test.js
new file mode 100644
index 0000000..2d1b3bf
--- /dev/null
+++ b/tests/assets/validatePhoneNumerStrict.test.js
@@ -0,0 +1,49 @@
+import {testInstances} from './bootstrap';
+
+describe.each(testInstances)('%s', (name, Nette) => {
+    test('no default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+
+        input.value = 'abcdef';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+
+        input.value = '+42012';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+
+        input.value = '212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+
+        input.value = '+420 212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(true);
+
+        input.value = '+420111111111';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+    });
+
+    test('CZ default region', () => {
+        document.body.innerHTML = '<form><input type="tel" name="phone" data-default-region-code="CZ"></form>';
+        const form = document.forms[0];
+        const input = form.elements[0];
+
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+
+        input.value = 'abcdef';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+
+        input.value = '+42012';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+
+        input.value = '212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(true);
+
+        input.value = '+420 212 345 678';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(true);
+
+        input.value = '+420111111111';
+        expect(Nette.validators.NepadaPhoneNumberInputValidator_validatePhoneNumberStrict(input)).toBe(false);
+    });
+});
diff --git a/tests/jest.config.js b/tests/jest.config.js
new file mode 100644
index 0000000..14c441a
--- /dev/null
+++ b/tests/jest.config.js
@@ -0,0 +1,4 @@
+/* eslint-disable no-undef */
+module.exports = {
+    transformIgnorePatterns: [],
+};