diff --git a/src/utils/fetchAccessTokenUsingRefreshToken.js b/src/utils/fetchAccessTokenUsingRefreshToken.js
index 03b74de..0a12187 100644
--- a/src/utils/fetchAccessTokenUsingRefreshToken.js
+++ b/src/utils/fetchAccessTokenUsingRefreshToken.js
@@ -1,21 +1,23 @@
 import { appConfig } from '../config';
 
-export const fetchAccessTokenUsingRefreshToken = async (refreshToken) => {
+export const fetchAccessTokenUsingRefreshToken = async (
+  refreshToken: string,
+): Promise<string> => {
   if (!refreshToken) {
     throw new Error('No refresh token available');
   }
 
-  return fetch(`${appConfig.API_URI}/api/auth/refresh`, {
+  const response = await fetch(`${appConfig.API_URI}/api/auth/refresh`, {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
     body: JSON.stringify({ refreshToken }),
-  })
-    .then((response) => response.json())
-    .then((data) => {
-      if (data.accessToken) {
-        return data.accessToken;
-      } else {
-        throw new Error('No access token available');
-      }
-    });
+  });
+
+  const data = await response.json();
+
+  if (!data.accessToken) {
+    throw new Error('Could not generate access token using refresh token');
+  }
+
+  return data.accessToken;
 };
diff --git a/src/utils/fetchAccessTokenUsingRefreshToken.test.ts b/src/utils/fetchAccessTokenUsingRefreshToken.test.ts
new file mode 100644
index 0000000..44e86c7
--- /dev/null
+++ b/src/utils/fetchAccessTokenUsingRefreshToken.test.ts
@@ -0,0 +1,50 @@
+import { fetchAccessTokenUsingRefreshToken } from './fetchAccessTokenUsingRefreshToken';
+
+jest.mock('../config', () => ({
+  appConfig: {
+    API_URI: 'https://example.com',
+  },
+}));
+
+describe('fetchAccessTokenUsingRefreshToken', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should throw an error if no refresh token is provided', async () => {
+    await expect(fetchAccessTokenUsingRefreshToken('')).rejects.toThrow(
+      'No refresh token available',
+    );
+  });
+
+  it('should return the access token if the request is successful', async () => {
+    const mockAccessToken = 'new-access-token';
+    global.fetch = jest.fn().mockResolvedValue({
+      json: jest.fn().mockResolvedValue({ accessToken: mockAccessToken }),
+    } as any);
+
+    const result = await fetchAccessTokenUsingRefreshToken(
+      'valid-refresh-token',
+    );
+
+    expect(result).toBe(mockAccessToken);
+  });
+
+  it('should throw an error if the access token is not returned', async () => {
+    global.fetch = jest.fn().mockResolvedValue({
+      json: jest.fn().mockResolvedValue({}),
+    } as any);
+
+    await expect(
+      fetchAccessTokenUsingRefreshToken('valid-refresh-token'),
+    ).rejects.toThrow('Could not generate access token using refresh token');
+  });
+
+  it('should throw an error if the fetch call fails', async () => {
+    global.fetch = jest.fn().mockRejectedValue(new Error('Network error'));
+
+    await expect(
+      fetchAccessTokenUsingRefreshToken('valid-refresh-token'),
+    ).rejects.toThrow('Network error');
+  });
+});
diff --git a/src/utils/fetchSymbols.ts b/src/utils/fetchSymbols.ts
index 352014a..27ac18f 100644
--- a/src/utils/fetchSymbols.ts
+++ b/src/utils/fetchSymbols.ts
@@ -19,6 +19,7 @@ export const fetchSymbols = async (): Promise<Array<string>> => {
     return parsedResponse.symbols;
   } catch (error) {
     Sentry.captureException(error);
-    return DEFAULT_SYMBOLS;
   }
+
+  return DEFAULT_SYMBOLS;
 };
diff --git a/src/utils/fetchWithToken.test.ts b/src/utils/fetchWithToken.test.ts
new file mode 100644
index 0000000..f529dcb
--- /dev/null
+++ b/src/utils/fetchWithToken.test.ts
@@ -0,0 +1,101 @@
+import { fetchWithToken } from './fetchWithToken';
+
+describe('fetchWithToken', () => {
+  const mockUrl = 'https://api.example.com/data';
+  const mockOptions = { method: 'GET' };
+
+  let mockFetch: jest.Mock;
+  let mockRefreshAccessToken: jest.Mock;
+  let mockSetAccessToken: jest.Mock;
+
+  beforeEach(() => {
+    mockFetch = jest.fn();
+    global.fetch = mockFetch;
+
+    mockRefreshAccessToken = jest.fn();
+    mockSetAccessToken = jest.fn();
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should make a request with the access token', async () => {
+    mockFetch.mockResolvedValueOnce({ status: 200 } as Response);
+
+    const response = await fetchWithToken({
+      url: mockUrl,
+      options: mockOptions,
+      accessToken: 'initial-token',
+      refreshAccessToken: mockRefreshAccessToken,
+    });
+
+    expect(mockFetch).toHaveBeenCalledWith(mockUrl, {
+      ...mockOptions,
+      headers: { Authorization: 'Bearer initial-token' },
+    });
+    expect(response.status).toBe(200);
+  });
+
+  it('should refresh the access token and retry the request if the first request is unauthorized', async () => {
+    mockFetch
+      .mockResolvedValueOnce({ status: 401 } as Response)
+      .mockResolvedValueOnce({ status: 200 } as Response);
+    mockRefreshAccessToken.mockResolvedValueOnce('new-token');
+
+    const response = await fetchWithToken({
+      url: mockUrl,
+      options: mockOptions,
+      accessToken: 'initial-token',
+      refreshAccessToken: mockRefreshAccessToken,
+      setAccessToken: mockSetAccessToken,
+    });
+
+    expect(mockFetch).toHaveBeenCalledTimes(2);
+    expect(mockFetch).toHaveBeenNthCalledWith(1, mockUrl, {
+      ...mockOptions,
+      headers: { Authorization: 'Bearer initial-token' },
+    });
+    expect(mockFetch).toHaveBeenNthCalledWith(2, mockUrl, {
+      ...mockOptions,
+      headers: { Authorization: 'Bearer new-token' },
+    });
+    expect(mockRefreshAccessToken).toHaveBeenCalled();
+    expect(mockSetAccessToken).toHaveBeenCalledWith('new-token');
+    expect(response.status).toBe(200);
+  });
+
+  it('should throw an error if the refresh token process fails', async () => {
+    mockFetch.mockResolvedValueOnce({ status: 401 } as Response);
+    mockRefreshAccessToken.mockRejectedValueOnce(
+      new Error('Refresh token failed'),
+    );
+
+    await expect(
+      fetchWithToken({
+        url: mockUrl,
+        options: mockOptions,
+        accessToken: 'initial-token',
+        refreshAccessToken: mockRefreshAccessToken,
+      }),
+    ).rejects.toThrow('Refresh token failed');
+
+    expect(mockFetch).toHaveBeenCalledTimes(1);
+    expect(mockRefreshAccessToken).toHaveBeenCalled();
+  });
+
+  it('should use default options if none are provided', async () => {
+    mockFetch.mockResolvedValueOnce({ status: 200 } as Response);
+
+    const response = await fetchWithToken({
+      url: mockUrl,
+      accessToken: 'initial-token',
+      refreshAccessToken: mockRefreshAccessToken,
+    });
+
+    expect(mockFetch).toHaveBeenCalledWith(mockUrl, {
+      headers: { Authorization: 'Bearer initial-token' },
+    });
+    expect(response.status).toBe(200);
+  });
+});
diff --git a/src/utils/fetchWithToken.ts b/src/utils/fetchWithToken.ts
index 470f135..498053c 100644
--- a/src/utils/fetchWithToken.ts
+++ b/src/utils/fetchWithToken.ts
@@ -1,8 +1,6 @@
-import { isTokenExpiringSoon } from './isTokenExpiringSoon';
-
 interface FetchWithTokenParams {
   url: RequestInfo | URL;
-  options: RequestInit | undefined;
+  options?: RequestInit;
   accessToken: string | null;
   refreshAccessToken: () => Promise<string>;
   setAccessToken?: (accessToken: string) => void;
@@ -15,36 +13,31 @@ export const fetchWithToken = async ({
   refreshAccessToken,
   setAccessToken,
 }: FetchWithTokenParams) => {
-  let newAccessToken = accessToken;
-
-  // Check if the token is expiring soon.
-  // If it is, refresh the access token and set the new token.
-  if (accessToken && isTokenExpiringSoon(accessToken)) {
-    newAccessToken = await refreshAccessToken();
-  }
-
-  const headers = {
-    ...options.headers,
-    // Add the Authorization header to the request
-    ...(accessToken ? { Authorization: `Bearer ${newAccessToken}` } : {}),
+  const getHeaders = (accessToken: string | null) => {
+    return {
+      ...options.headers,
+      // Add the Authorization header to the request
+      ...(accessToken ? { Authorization: `Bearer ${accessToken}` } : {}),
+    };
   };
 
-  const response = await fetch(url, { ...options, headers });
+  let response = await fetch(url, {
+    ...options,
+    headers: getHeaders(accessToken),
+  });
 
   if (response.status === 401) {
     // If the response is 401 Unauthorized, refresh the access token and try again.
-    newAccessToken = await refreshAccessToken();
+    const newAccessToken = await refreshAccessToken();
 
     if (setAccessToken) {
       setAccessToken(newAccessToken);
     }
 
-    const headers = {
-      ...options.headers,
-      ...(accessToken ? { Authorization: `Bearer ${newAccessToken}` } : {}),
-    };
-
-    return fetch(url, { ...options, headers });
+    response = await fetch(url, {
+      ...options,
+      headers: getHeaders(newAccessToken),
+    });
   }
 
   return response;
diff --git a/src/utils/getCookieValue.test.ts b/src/utils/getCookieValue.test.ts
new file mode 100644
index 0000000..21b0be1
--- /dev/null
+++ b/src/utils/getCookieValue.test.ts
@@ -0,0 +1,34 @@
+import { getCookieValue } from './getCookieValue';
+
+describe('getCookieValue', () => {
+  beforeEach(() => {
+    // Clear document.cookie before each test
+    document.cookie = '';
+  });
+
+  it('should return the value of the specified cookie', () => {
+    document.cookie = 'testCookie=testValue';
+    expect(getCookieValue('testCookie')).toBe('testValue');
+  });
+
+  it('should return null if the specified cookie does not exist', () => {
+    expect(getCookieValue('nonExistentCookie')).toBeNull();
+  });
+
+  it('should return the correct value if multiple cookies are present', () => {
+    document.cookie = 'cookie1=value1';
+    document.cookie = 'cookie2=value2';
+    expect(getCookieValue('cookie1')).toBe('value1');
+    expect(getCookieValue('cookie2')).toBe('value2');
+  });
+
+  it('should handle cookies with spaces around the name', () => {
+    document.cookie = ' testCookieWithSpaces = testValue ';
+    expect(getCookieValue('testCookieWithSpaces')).toBe('testValue');
+  });
+
+  it('should return null if the cookie value is empty', () => {
+    document.cookie = 'emptyCookie=';
+    expect(getCookieValue('emptyCookie')).toBe(null);
+  });
+});
diff --git a/src/utils/getCookieValue.ts b/src/utils/getCookieValue.ts
index 1b2e63b..701a834 100644
--- a/src/utils/getCookieValue.ts
+++ b/src/utils/getCookieValue.ts
@@ -1,8 +1,4 @@
-export const getCookieValue = (name: string) => {
+export const getCookieValue = (name: string): string | null => {
   const match = document.cookie.match(new RegExp('(^| )' + name + '=([^;]+)'));
-  if (match) {
-    return match[2];
-  }
-
-  return null;
+  return match ? match[2] : null;
 };
diff --git a/src/utils/isTokenExpiringSoon.ts b/src/utils/isTokenExpiringSoon.ts
index 00227ca..4b73381 100644
--- a/src/utils/isTokenExpiringSoon.ts
+++ b/src/utils/isTokenExpiringSoon.ts
@@ -1,5 +1,6 @@
 import { jwtDecode, JwtPayload } from 'jwt-decode';
 import { z } from 'zod';
+import * as Sentry from '@sentry/react';
 
 // Define the Zod schema for the JWT payload
 const jwtPayloadSchema = z.object({
@@ -12,7 +13,7 @@ export const isTokenExpiringSoon = (
 ): boolean => {
   try {
     const decodedPayload = jwtDecode<JwtPayload>(jwt);
-    
+
     // Validate the decoded payload
     const parsedPayload = jwtPayloadSchema.parse(decodedPayload);
 
@@ -24,6 +25,8 @@ export const isTokenExpiringSoon = (
 
     return Date.now() >= exp * 1000 - threshold;
   } catch (e) {
-    return true;
+    Sentry.captureException(e);
   }
+
+  return true;
 };
diff --git a/src/utils/nonNullable.test.ts b/src/utils/nonNullable.test.ts
new file mode 100644
index 0000000..04af252
--- /dev/null
+++ b/src/utils/nonNullable.test.ts
@@ -0,0 +1,27 @@
+import { nonNullable } from './nonNullable';
+
+describe('nonNullable', () => {
+  it('should return false for null', () => {
+    expect(nonNullable(null)).toBe(false);
+  });
+
+  it('should return false for undefined', () => {
+    expect(nonNullable(undefined)).toBe(false);
+  });
+
+  it('should return true for a non-null value', () => {
+    expect(nonNullable(0)).toBe(true);
+    expect(nonNullable('')).toBe(true);
+    expect(nonNullable(false)).toBe(true);
+    expect(nonNullable([])).toBe(true);
+    expect(nonNullable({})).toBe(true);
+    expect(nonNullable('string')).toBe(true);
+    expect(nonNullable(123)).toBe(true);
+  });
+
+  it('should filter out null and undefined values from an array', () => {
+    const array = [1, null, 2, undefined, 3];
+    const filteredArray = array.filter(nonNullable);
+    expect(filteredArray).toEqual([1, 2, 3]);
+  });
+});