diff --git a/app/navigators/AppNavigator.js b/app/navigators/AppNavigator.js
index d3baa1c..b03dff6 100644
--- a/app/navigators/AppNavigator.js
+++ b/app/navigators/AppNavigator.js
@@ -3,7 +3,7 @@ import { createStackNavigator } from '@react-navigation/stack';
 import SplashScreen from '@scenes/SplashScreen/';
 import ExampleScreen from '@scenes/ExampleScreen';
 import { NavigationContainer } from '@react-navigation/native';
-import NavigationService from '../services/NavigationService';
+import { setTopLevelNavigator } from '../services/NavigationService';
 const Stack = createStackNavigator();
 /**
  * The root screen contains the application's navigation.
@@ -12,7 +12,7 @@ const Stack = createStackNavigator();
  */
 export default function AppNavigator() {
   return (
-    <NavigationContainer ref={NavigationService.setTopLevelNavigator}>
+    <NavigationContainer ref={setTopLevelNavigator}>
       <Stack.Navigator headerMode="none" initialRouteName="SplashScreen">
         <Stack.Screen name="SplashScreen" component={SplashScreen} />
         <Stack.Screen name="MainScreen" component={ExampleScreen} />
diff --git a/app/scenes/RootScreen/index.js b/app/scenes/RootScreen/index.js
index 122c23f..93f16f3 100644
--- a/app/scenes/RootScreen/index.js
+++ b/app/scenes/RootScreen/index.js
@@ -1,11 +1,10 @@
 import { connect } from 'react-redux';
 import { PropTypes } from 'prop-types';
-import NavigationService from '@services/NavigationService';
 import AppNavigator from '@navigators/AppNavigator';
 import Container from '@atoms/Container';
-
 import { rootScreenActions } from './reducer';
 import React, { useEffect } from 'react';
+import { setRefForTopLevelNavigtor } from '@app/services/NavigationService';
 
 const RootScreen = props => {
   useEffect(() => {
@@ -13,10 +12,6 @@ const RootScreen = props => {
     props.startup();
   }, []);
 
-  const setRefForTopLevelNavigtor = navigatorRef => {
-    NavigationService.setTopLevelNavigator(navigatorRef);
-  };
-
   return (
     <Container testID="root-screen">
       <AppNavigator ref={setRefForTopLevelNavigtor} />
diff --git a/app/scenes/RootScreen/saga.js b/app/scenes/RootScreen/saga.js
index 098f16e..a988d24 100644
--- a/app/scenes/RootScreen/saga.js
+++ b/app/scenes/RootScreen/saga.js
@@ -1,12 +1,12 @@
 import { takeLatest } from 'redux-saga/effects';
-import NavigationService from '@app/services/NavigationService';
+import { navigateAndReset } from '@app/services/NavigationService';
 import { rootScreenTypes } from './reducer';
 
 /**
  * The startup saga is the place to define behavior to execute when the application starts.
  */
 export function* startup() {
-  setTimeout(() => NavigationService.navigateAndReset('MainScreen'), 1000);
+  setTimeout(() => navigateAndReset('MainScreen'), 1000);
 }
 
 /**
diff --git a/app/scenes/RootScreen/tests/saga.test.js b/app/scenes/RootScreen/tests/saga.test.js
index f8ce417..c743c43 100644
--- a/app/scenes/RootScreen/tests/saga.test.js
+++ b/app/scenes/RootScreen/tests/saga.test.js
@@ -1,3 +1,4 @@
+/* eslint-disable sonarjs/no-duplicate-string */
 /**
  * Test sagas
  */
@@ -5,12 +6,22 @@
 /* eslint-disable redux-saga/yield-effects */
 
 import { takeLatest } from 'redux-saga/effects';
-import NavigationService from 'app/services/NavigationService';
+// import NavigationService from 'app/services/NavigationService';
+import { navigateAndReset } from '@app/services/NavigationService';
 import { timeout } from 'app/utils/testUtils';
 import rootScreenSaga, { startup } from '../saga';
 import { rootScreenTypes } from '../reducer';
 import set from 'lodash/set';
+
+const NavigationService = '@app/services/NavigationService';
+jest.mock('@app/services/NavigationService', () => ({
+  ...jest.requireActual('@app/services/NavigationService'),
+  navigateAndReset: jest.fn()
+}));
 describe('Tests for RootScreen sagas', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
   const setupTests = () => ({
     generator: rootScreenSaga(),
     submitSpy: jest.fn()
@@ -25,15 +36,10 @@ describe('Tests for RootScreen sagas', () => {
 
   it('should ensure that the navigation service is called after waiting for 1000ms', async () => {
     const method = startup();
-    NavigationService.setTopLevelNavigator({ dispatch: () => {} });
-    const navigateAndResetSpy = jest.spyOn(
-      NavigationService,
-      'navigateAndReset'
-    );
     method.next();
     await timeout(1000);
-    expect(navigateAndResetSpy).toHaveBeenCalled();
-    expect(navigateAndResetSpy).toHaveBeenCalledWith('MainScreen');
+    expect(navigateAndReset).toHaveBeenCalled();
+    expect(navigateAndReset).toHaveBeenCalledWith('MainScreen');
   });
 
   it('should ensure that the navigation service is called after waiting for 1000ms', async () => {
diff --git a/app/services/NavigationService.js b/app/services/NavigationService.js
index 467c8ac..7b5ae4b 100644
--- a/app/services/NavigationService.js
+++ b/app/services/NavigationService.js
@@ -50,8 +50,4 @@ function navigateAndReset(routeName, params) {
   );
 }
 
-export default {
-  navigate,
-  navigateAndReset,
-  setTopLevelNavigator
-};
+export { navigate, navigateAndReset, setTopLevelNavigator };
diff --git a/app/services/UserService.test.js b/app/services/tests/UserService.test.js
similarity index 94%
rename from app/services/UserService.test.js
rename to app/services/tests/UserService.test.js
index 53cbead..a8155f7 100644
--- a/app/services/UserService.test.js
+++ b/app/services/tests/UserService.test.js
@@ -1,6 +1,6 @@
 import MockAdapter from 'axios-mock-adapter';
 import { getApiClient } from 'app/utils/apiUtils';
-import { getUser } from './UserService';
+import { getUser } from '../UserService';
 
 describe('UserService tests', () => {
   it('should make the api call to "/quotes?count=1"', async () => {
diff --git a/app/services/tests/navigate.test.js b/app/services/tests/navigate.test.js
new file mode 100644
index 0000000..fea5a93
--- /dev/null
+++ b/app/services/tests/navigate.test.js
@@ -0,0 +1,32 @@
+import { navigate, setTopLevelNavigator } from '../NavigationService';
+import { NavigationActions } from '@react-navigation/compat';
+jest.mock('@react-navigation/compat', () => ({
+  NavigationActions: {
+    navigate: jest.fn()
+  }
+}));
+const navigatorRef = { goBack: 'goBack', dispatch: jest.fn() };
+setTopLevelNavigator(navigatorRef);
+describe('navigate', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('dispatches navigation action with the correct routeName and params', () => {
+    const routeName = '/test';
+    const params = { screen: 'MainScreen' };
+    NavigationActions.navigate.mockReturnValueOnce({
+      type: 'NAVIGATE_ACTION',
+      payload: { routeName, params }
+    });
+    navigate(routeName, params);
+    expect(NavigationActions.navigate).toHaveBeenCalledWith({
+      routeName,
+      params
+    });
+    expect(navigatorRef.dispatch).toHaveBeenCalledWith({
+      type: 'NAVIGATE_ACTION',
+      payload: { routeName, params }
+    });
+  });
+});
diff --git a/app/services/tests/navigateAndReset.test.js b/app/services/tests/navigateAndReset.test.js
new file mode 100644
index 0000000..0a0df12
--- /dev/null
+++ b/app/services/tests/navigateAndReset.test.js
@@ -0,0 +1,34 @@
+import { setTopLevelNavigator, navigateAndReset } from '../NavigationService';
+import { StackActions } from '@react-navigation/compat';
+
+jest.mock('@react-navigation/compat', () => ({
+  StackActions: {
+    replace: jest.fn()
+  }
+}));
+const navigatorRef = { goBack: 'goBack', dispatch: jest.fn() };
+setTopLevelNavigator(navigatorRef);
+describe('test navigateAndReset', () => {
+  afterEach(() => {
+    // Reset mocks after each test
+    jest.clearAllMocks();
+  });
+
+  it('dispatches stack action with the correct routeName and params', () => {
+    const routeName = '/test';
+    const params = { screen: 'MainScreen' };
+    StackActions.replace.mockReturnValueOnce({
+      type: 'NAVIGATE_ACTION',
+      payload: { routeName, params }
+    });
+    navigateAndReset(routeName, params);
+    expect(StackActions.replace).toHaveBeenCalledWith({
+      routeName,
+      params
+    });
+    expect(navigatorRef.dispatch).toHaveBeenCalledWith({
+      type: 'NAVIGATE_ACTION',
+      payload: { routeName, params }
+    });
+  });
+});
diff --git a/app/services/tests/setTopLevelNavigation.test.js b/app/services/tests/setTopLevelNavigation.test.js
new file mode 100644
index 0000000..dcf2aa1
--- /dev/null
+++ b/app/services/tests/setTopLevelNavigation.test.js
@@ -0,0 +1,20 @@
+import set from 'lodash/set';
+import { setTopLevelNavigator } from '../NavigationService';
+jest.mock('lodash/set', () => jest.fn());
+describe('setTopLevelNavigator', () => {
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+  it('sets the navigator object with the provided reference', () => {
+    const navigatorObject = {
+      navigator: null
+    };
+    const navigatorRef = { goBack: 'goBack' };
+    setTopLevelNavigator(navigatorRef);
+    expect(set).toHaveBeenCalledWith(
+      navigatorObject,
+      'navigator',
+      navigatorRef
+    );
+  });
+});