amount checkBalance (acctid account)

result fundTransfer(acctid sourceid, 
acctid destid, posint amount)


CONVERSATIONS:
C
C-F 

C:

IT190000002345,		OK
ABCde045012222,		KO
EMPTY			KO
ABCde045012222ARCde045012222	KO

F:
IT240000002578,	2000	OK
IT240000002578,	0	OK
IT240000002578,	-100	OK	
IT190000002345,	2000	OK
IT190000002345,	0	OK
IT190000002345,	-1000	KO
ABCde045012222,	2000    KO
ABCde045012222,	0    	KO
ABCde045012222,	-1000   KO
EMPTY,2000		KO
EMPTY,0			KO
EMPTY,-1000		KO
ABCde045012222ARCde045012222, 2000	KO
ABCde045012222ARCde045012222,  0	KO
ABCde045012222ARCde045012222, -1000	KO


C-F:(senza modello implementazione)

IT190000002345,		
IT240000002578,	2000	KO


IT190000002345,		
IT190000002345,	2000	OK


IT190000002345,		
IT190000002345,	0	OK

 ..... TO BE CONTINUED

SAPENDO CHE L'IMPLEMENTAZIONE DI C E' STATELESS
E CHE L'IMPLEMENTAZIONE DI F HA AUTOMA INTERNO
TRANSFER.amount <= 5000 - stato dotransfer
TRANSFER.amount > 5000 - stato ask authorization
authorization = Y stato do transfer
authorization = N stato endtransfer

scrivere almeno 3 casi di test per C-F