Add SIgn in form snapshot test

src/components/contexts/__mocks__/UserContext.jsx

@@ -0,0 +1,19 @@
+import React from 'react';
+
+export const UserProvider = ({ children }) => {
+  return (
+    <div data-testid="mocked-userprovider">
+      {children}
+    </div>
+  );
+};
+
+export const useUserContext = () => ({
+  fetching: false,
+  token: null,
+  error: null,
+  setError: jest.fn(),
+  signIn: jest.fn(),
+  signUp: jest.fn(),
+  signOut: jest.fn(),
+});