Add UserContext unit test for signup

src/services/__mocks__/auth.js

@@ -0,0 +1,17 @@
+let signInResponse = {};
+let signUpResponse = {};
+let verifyResponse = {};
+
+const logResponse = (response) => {
+  console.log('logResponse', response);
+  return response;
+};
+
+export default {
+  signIn: async (username, password) => logResponse(signInResponse),
+  signUp: async (username, password) => logResponse(signUpResponse),
+  verify: async (jwt) => logResponse(verifyResponse),
+  setSignInResponse: (value) => { signInResponse = value; },
+  setSignUpResponse: (value) => { signUpResponse = value; },
+  setVerifyResponse: (value) => { verifyResponse = value; },
+}