diff --git a/.eslintignore b/.eslintignore
index e8bab8f..6e5df09 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,4 +1,5 @@
 babel.config.js
 transformer.js
 metro.config.js
-*scss.d.ts
\ No newline at end of file
+*scss.d.ts
+**/reports/*
\ No newline at end of file
diff --git a/.eslintrc b/.eslintrc
index 15e1bcd..10f28ca 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,11 +1,21 @@
 {
 	"extends": ["webstrong/native", "webstrong/typescript", "plugin:@typescript-eslint/base"],
+	"plugins": ["jest"],
 	"parserOptions": {
 		"project": "./tsconfig.json",
 		"ecmaVersion": 2021,
 		"sourceType": "module"
 	},
+	"env": {
+		"jest/globals": true
+	},
 	"rules": {
+		"jest/no-disabled-tests": "warn",
+		"jest/no-focused-tests": "error",
+		"jest/no-identical-title": "error",
+		"jest/prefer-to-have-length": "warn",
+		"jest/valid-expect": "error",
+
 		"react/require-default-props": 0,
 		"@typescript-eslint/ban-ts-comment": 0,
 		"react/no-array-index-key": 0,
@@ -18,6 +28,7 @@
 		"react/jsx-indent-props": 0,
 		"react/jsx-wrap-multilines": 0,
 		"react/no-unused-prop-types": 0,
-		"react/jsx-one-expression-per-line": 0
+		"react/jsx-one-expression-per-line": 0,
+		"@typescript-eslint/no-var-requires": 0
 	}
 }
diff --git a/.github/workflows/actions.yml b/.github/workflows/actions.yml
index c3df28d..770fa0a 100644
--- a/.github/workflows/actions.yml
+++ b/.github/workflows/actions.yml
@@ -27,6 +27,9 @@ jobs:
       - name: Test prettier and eslint
         run: npm run lint-cleanup
 
+      - name: Run tests
+        run: npm run test
+
       - uses: expo/expo-github-action@v5
         with:
           expo-packager: npm
diff --git a/.gitignore b/.gitignore
index a7eef9b..b1d62a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,4 +8,5 @@ package-lock.json
 *.p12
 *.key
 *.mobileprovision
-*scss.d.ts
\ No newline at end of file
+*scss.d.ts
+**/reports/*
\ No newline at end of file
diff --git a/.prettierignore b/.prettierignore
index cff3c8a..fc17ed7 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1 +1,2 @@
-*scss.d.ts
\ No newline at end of file
+*scss.d.ts
+**/reports/*
\ No newline at end of file
diff --git a/__tests__/fixtures.ts b/__tests__/fixtures.ts
new file mode 100644
index 0000000..064846f
--- /dev/null
+++ b/__tests__/fixtures.ts
@@ -0,0 +1,60 @@
+import { Difficulty, Settings } from '../src/types/settings'
+import { Pause } from '../src/types/pause'
+
+export const defaultSettings: Settings = {
+	id: 1,
+	lang: 'en',
+	level: 1,
+	points: 0,
+	difficulty: 'easy',
+	time: 'medium',
+	version: '1.0.0',
+}
+
+export const musicExample = {
+	name: 'Sea',
+	requiredLevel: 1,
+}
+
+export const exerciseExample = {
+	name: 'Wall Sit',
+	difficulty: 'easy' as Difficulty,
+	iconName: 'wall_sit',
+	requiredLevel: 1,
+	time: {
+		short: {
+			pauseTime: 20,
+			exerciseCount: 3,
+			exerciseTime: 40,
+			totalTime: 160,
+		},
+		medium: {
+			pauseTime: 20,
+			exerciseCount: 4,
+			exerciseTime: 50,
+			totalTime: 260,
+		},
+		long: {
+			pauseTime: 20,
+			exerciseCount: 6,
+			exerciseTime: 70,
+			totalTime: 460,
+		},
+	},
+}
+
+export const themeExample = {
+	requiredLevel: 1,
+	colors: {
+		primary: '#1A6A73',
+		secondary: '#FFFFFF',
+		third: '#C5D1D9',
+		optional: '#5A5A5A',
+		progress: '#F2B077',
+	},
+}
+
+export const pauseExample: Pause = {
+	music: musicExample,
+	exercise: exerciseExample,
+}
diff --git a/__tests__/utils/helpers.spec.ts b/__tests__/utils/helpers.spec.ts
new file mode 100644
index 0000000..666d5cd
--- /dev/null
+++ b/__tests__/utils/helpers.spec.ts
@@ -0,0 +1,26 @@
+import { defaultSettings, pauseExample } from '../fixtures'
+import { getNextLevelBenefits, getPointsToLevelUp, getRandomPause } from '../../src/utils/helpers'
+import { baseLevelPoints, progressMultiplier } from '../../src/utils/consts'
+
+describe('Helpers fn', () => {
+	it('should get pause', () => {
+		const pause = getRandomPause(pauseExample, defaultSettings)
+		expect(pause).toMatchObject(pauseExample)
+	})
+	it('should get points to level up', () => {
+		const pointsToLevelUp = getPointsToLevelUp(1)
+		expect(pointsToLevelUp).toEqual(baseLevelPoints + progressMultiplier)
+	})
+	it('should get next level benefits', () => {
+		const matchObject = {
+			music: {},
+			exercises: {},
+			themes: {},
+		}
+
+		const nextLevelBenefits = getNextLevelBenefits(1)
+		expect(nextLevelBenefits).toMatchObject(matchObject)
+		const nextLevelBenefitsTo100Level = getNextLevelBenefits(100)
+		expect(nextLevelBenefitsTo100Level).toMatchObject(matchObject)
+	})
+})
diff --git a/app.json b/app.json
index e4e1da0..75ce102 100644
--- a/app.json
+++ b/app.json
@@ -13,6 +13,7 @@
 			"resizeMode": "cover",
 			"backgroundColor": "#ffffff"
 		},
+		"primaryColor": "#1A6A73",
 		"updates": {
 			"fallbackToCacheTimeout": 0
 		},
diff --git a/database/db.ts b/database/db.ts
index 971dea2..428d263 100644
--- a/database/db.ts
+++ b/database/db.ts
@@ -1,8 +1,8 @@
 import { openDatabase } from 'expo-sqlite'
-import app from '../app.json'
+import { expo } from '../app.json'
 import { getLocale } from '../src/utils/helpers'
 
-export const VERSION = app.expo.version
+export const VERSION = expo.version
 export const db = openDatabase('pause.db', VERSION)
 
 export const initDatabase = (callback: () => void) => {
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..65f023f
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,17 @@
+module.exports = {
+	moduleFileExtensions: ['js', 'ts'],
+	transform: {
+		'^.+\\.(ts)$': 'ts-jest',
+	},
+	transformIgnorePatterns: [
+		'node_modules/(?!(jest-)?react-native|react-clone-referenced-element|@react-native-community|expo(nent)?|@expo(nent)?/.*|react-navigation|@react-navigation/.*|@unimodules/.*|unimodules|sentry-expo|native-base|@sentry/.*)',
+	],
+	testMatch: ['**/__tests__/**/*.spec.(ts)'],
+	preset: 'jest-expo',
+	reporters: ['default', ['jest-junit', { outputDirectory: 'reports/tests' }]],
+	resetMocks: true,
+	coverageDirectory: 'reports/coverage',
+	moduleNameMapper: {
+		'^config(.*)$': '<rootDir>/src/config$1',
+	},
+}
diff --git a/package.json b/package.json
index 0be6b40..e17c61c 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,11 @@
 		"eject": "expo eject",
 		"cleanup": "prettier --config .prettierrc --write \"**/*.+(js|jsx|ts|tsx|json|scss|md)\" && npm run eslint",
 		"lint-cleanup": "prettier --config .prettierrc --check \"**/*.+(js|jsx|ts|tsx|json|scss|md)\" && npm run eslint",
-		"eslint": "eslint --fix ."
+		"eslint": "eslint --fix .",
+		"test": "jest --config jest.config.js"
+	},
+	"jest": {
+		"preset": "jest-expo-enzyme"
 	},
 	"dependencies": {
 		"@expo/metro-config": "^0.1.54",
@@ -46,6 +50,8 @@
 	},
 	"devDependencies": {
 		"@babel/core": "~7.9.0",
+		"@types/enzyme": "^3.10.8",
+		"@types/jest": "^26.0.20",
 		"@types/react": "~16.9.35",
 		"@types/react-native": "~0.63.2",
 		"@types/react-native-modals": "^0.19.0",
@@ -59,14 +65,19 @@
 		"eslint-config-prettier": "^7.2.0",
 		"eslint-config-webstrong": "^1.1.5",
 		"eslint-plugin-import": "^2.22.1",
+		"eslint-plugin-jest": "^24.2.1",
 		"eslint-plugin-jsx-a11y": "^6.4.1",
 		"eslint-plugin-prettier": "^3.3.1",
 		"eslint-plugin-react": "^7.22.0",
 		"eslint-plugin-react-hooks": "^4.2.0",
 		"eslint-plugin-react-native": "^3.10.0",
+		"jest-expo": "^40.0.2",
+		"jest-expo-enzyme": "^1.0.4",
+		"jest-junit": "^12.0.0",
 		"node-sass": "^5.0.0",
 		"prettier": "2.2.1",
 		"react-native-typed-sass-transformer": "^0.11.0",
+		"ts-jest": "^26.5.3",
 		"typescript": "~4.0.0"
 	},
 	"private": true
diff --git a/src/screens/Settings/Settings.tsx b/src/screens/Settings/Settings.tsx
index 8afa213..1652495 100644
--- a/src/screens/Settings/Settings.tsx
+++ b/src/screens/Settings/Settings.tsx
@@ -25,7 +25,8 @@ import {
 import useShowFailureMessage from '../../utils/hooks/useShowFailureMessage'
 import useShowMessage from '../../utils/hooks/useShowMessage'
 import Header from '../../components/Header/Header'
-import { defaultColor, addBackgroundColor, addTextColor } from '../../utils/helpers'
+import { addBackgroundColor, addTextColor } from '../../utils/helpers'
+import { defaultColor } from '../../utils/consts'
 
 type Props = {
 	navigation: NavigationScreenType
diff --git a/src/utils/consts.ts b/src/utils/consts.ts
index da5d2fa..fa7cfee 100644
--- a/src/utils/consts.ts
+++ b/src/utils/consts.ts
@@ -1,4 +1,7 @@
 import { Dimensions } from 'react-native'
+import { expo } from '../../app.json'
+
+export const defaultColor = expo.primaryColor
 
 export const headerHeight = Dimensions.get('screen').height / 7
 export const centerHeight = Dimensions.get('screen').height * 0.4
diff --git a/src/utils/helpers.ts b/src/utils/helpers.ts
index ebfb155..697136e 100644
--- a/src/utils/helpers.ts
+++ b/src/utils/helpers.ts
@@ -15,9 +15,9 @@ import {
 	shortTimeMultiplier,
 } from './consts'
 
-import music from '../config/music.json'
-import exercises from '../config/exercises.json'
-import themes from '../config/themes.json'
+const music = require('../config/music.json')
+const exercises = require('../config/exercises.json')
+const themes = require('../config/themes.json')
 
 export const getLocale = () => {
 	const locale =
@@ -30,8 +30,6 @@ export const getLocale = () => {
 	return 'en'
 }
 
-export const defaultColor = (themes as Theme[])[0].colors.primary
-
 export const getRandomPause = (pause: Pause, settings: Settings): Pause => ({
 	music: getRandomMusic(pause.music, settings.level),
 	exercise: getRandomExercises(pause.exercise, settings.level, settings.difficulty),