Getting map value null while running from Test class

Question

I have a map here mapOfQuesToAnsToYearToMaleOrFemaleCount and I am trying to get count here from test class, calling from VF Page I am able to achieve this but not in test class. from test class I am getting my map(mapOfQuesToAnsToYearToMaleOrFemaleCount) like below but not able to get the value of count, can any body tell me what is the problem?

Integer count = mapOfQuesToAnsToYearToMaleOrFemaleCount.get(questionID).get(answerId).get(year).get(gender); //trying to get value of count 

system.debug(mapOfQuesToAnsToYearToMaleOrFemaleCount); 
// {a045E000001Bs6NQAS={a005E000002My8CQAS={year 07={Female=0, Male=0}}}, a045E000001Bs6OQAS={a005E000002My8DQAS={year 07={Female=0, Male=0}}, a005E000002My8EQAS={year 07={Female=0, Male=0}}}} //map I got from running test

system.debug(questionID);
//a045E000001Bs6NQAS

system.debug(answerId);
// a005E000002My8CQAS

system.debug(year);
//year 07

system.debug(gender);
//Female

system.debug(count);
//null

Answer 1

Can you copy how you have defined your Map object. Seems like the way your are passing values to Map to fetch value is not correct that's why it's returning a Null.

I looked at the Map Valued object that you posted and the structure doesn't look ok to me.

I wrote below sample code and it works perfectly for me.

Map<String,Map<String,Map<String,Map<String,Integer>>>>
    mapObject=new Map<String,Map<String,Map<String,Map<String,Integer>>>>();
Map<String,Integer> gender=new Map<String,Integer>();
gender.put('Female',0);
gender.put('Male',0);

Map<String,Map<String,Integer>> year=new Map<String,Map<String,Integer>>();
year.put('year 07',gender);

Map<String,Map<String,Map<String,Integer>>> answers=new Map<String,Map<String,Map<String,Integer>>>();
answers.put('a005E000002My8CQAS',year);

Map<String,Map<String,Map<String,Map<String,Integer>>>> questions=new Map<String,Map<String,Map<String,Map<String,Integer>>>>();
questions.put('a045E000001Bs6NQAS',answers);

System.debug(questions);

Integer count=questions.get('a045E000001Bs6NQAS').get('a005E000002My8CQAS').get('year 07').get('Female');

System.debug('count is '+count);