Base will return a *log.entry with set service name JSON key as value If predefined log entry is supplied, the JSON fields will be added on top of that.

LogError logs error with "msg" and sets the "err" as value of error key.

WithTestType will return a *log.entry with set test type JSON key as value If predefined log entry is supplied, the JSON fields will be added on top of that.

Logger is defined during initialization and kept globally to be used everywhere.