Unable to unit test a class which calls an API - unit-testing

Question

I have the following two classes -
Service class
#Service
public class ProfileInfoCacheService {
public ProfileInfoResponse getProfileInfo(String uuid) {
ProfileInfoResponse response = getUserInfoFromIdentity(uuid);
return response;
}
public ProfileInfoResponse getUserInfoFromIdentity(String identity) {
LinkedHashMap<String, List<UserInfo>> profileInfo = userService.getUserInfoFromIdentity(identityList);
return profcache.getProfileInfo();
}
And component
#Component
public class UserInfoServiceImpl implements UserInfoService {
#SuppressWarnings("unchecked")
#Override
public LinkedHashMap<String, List<UserInfo>> getUserInfoFromIdentity(List<String> identityList) {
//Calls an API and returns data in LinkedHashMap.
}
Now, here is my test case file. Please bear with me as I am still new at it.
package com.citruspay.prepaid;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
//class file imports
import org.mockito.runners.MockitoJUnitRunner;
#RunWith(MockitoJUnitRunner.class)
public class ProfileInfoCacheServiceTest {
private PrepaidAccount account;
private ProfileInfoCacheService pics;
#Before
public void setUp() throws Exception {
account = new PrepaidAccount("8588844251");
//pics = new ProfileInfoCacheService();
ProfileInfoCacheService pics = mock(ProfileInfoCacheService.class);
}
#Test
public void testConstructor() {
assertEquals("8588888888", account.owner());
}
#Test
public void testNumber() throws Exception {
ProfileInfoResponse response = pics.getProfileInfo("7266704751953077361"); //pics is null here
assertEquals("", response.getEmail() );
assertEquals("8588888888", response.getMobile() );
}
}
The response of getProfileInfo() call is expected to be in this format -
{
"email": "some.email#something.in",
"mobile": "8888888888",
}
Every mobile/email pair has a number (like 7266704751953077361), using which, when the API is called, it returns the same.
However, I am getting a Null Pointer exception, due to pics being null where I call pics.getProfileInfo("7266704751953077361").
Please help me correct my mistake here.
Update
Upon changing mock() to new class call, I get the ProfileInfoCacheService object but then on moving the debug to the last line of the setup() method, getting the following -
java.lang.ExceptionInInitializerError
at org.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:72)
at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:45)
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
at com.citruspay.prepaid.common.user.beans.ProfileInfoCacheService.<init>(ProfileInfoCacheService.java:42)
at com.citruspay.prepaid.ProfileInfoCacheServiceTest.setUp(ProfileInfoCacheServiceTest.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)
at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
at org.slf4j.impl.Log4jLoggerFactory.<clinit>(Log4jLoggerFactory.java:54)
... 33 more
Update 2
Adding more details of ProfileInfoCacheService class -
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.PostConstruct;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import redis.clients.jedis.exceptions.JedisException;
import com.aerospike.client.AerospikeException;
import com.aerospike.client.Key;
import com.citruspay.prepaid.common.cache.dao.ProfileInfoCacheDao;
import com.citruspay.prepaid.common.cache.entity.ProfileInfoCache;
import com.citruspay.prepaid.common.cache.factory.DaoCacheFactory;
import com.citruspay.prepaid.common.user.process.UserInfoServiceImpl;
import com.spikeify.ResultSet;
#Service
public class ProfileInfoCacheService {
#Autowired
UserInfoServiceImpl userService;
#Autowired
DaoCacheFactory<ProfileInfoCacheDao> daoCacheFactory;
#PostConstruct
public void init() {
ProfileInfoCacheDao profileInfoCacheDao = daoCacheFactory.getDaoForRead(ProfileInfoCacheDao.class);
profileInfoCacheDao.init();
}
Logger logger = LoggerFactory.getLogger(ProfileInfoCacheService.class);