Implement unit tests for the Mediarequests services.

For comparison and reference, the existing AQS production unit tests can be found in analytics-aqs/test/features/mediarequests/mediarequests.js

Completion criteria: the following unit tests are implemented:

per file endpoint

• should return 200 for expected parameters
• should return 400 when per file parameters are wrong
• should return the expected per file data after insertion
• should return the expected all agent types per file data after insertion
• should handle per file queries with encoded characters
• should return data when start = timestamp = end and YYYYMMDD is used
• should return the expected per file monthly data after insertion
• should return the expected monthly data only for full months
• should return 400 when there are no full months in specified date range

per referer aggregate endpoint

• should return 200 for expected parameters
• should return 400 when aggregate parameters are wrong
• should return 400 when start is before end
• should return 400 when timestamp is invalid
• should return multiple hours inside a day

tops endpoint

• should return 400 when tops parameters are wrong
• should return 400 when all-year is used for the year parameter
• should return 400 when all-months is used for the month parameter
• should return 400 when tops date is invalid
• should return the expected tops data after insertion, in rank order