Rethink TDD. Break up tests:
Remove test Initialize
Add 5 tests:
"Throw 'Calendar must receive settings' (code: 1)",
"Throw 'Object 'wrap' does not exist' (code: 2)",
"Throw 'Object 'period' does not exist' (code: 3)",
"Throw 'Wrong period content' (code: 4)",
"Throw 'From' must be less or equal then 'to' (code: 5)"