Exercise Instructions

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Code​ ​Test:​ ​Banking
About​ ​This​ ​Test
The​ ​purpose​ ​of​ ​this​ ​code​ ​test​ ​is​ ​to​ ​show​ ​us​ ​your​ ​skills​ ​in:
• Object​ ​Oriented​ ​Programming
• TDD
• Clean​ ​code
• Git
• Problem​ ​solving
Please​ ​keep​ ​these​ ​aspects​ ​in​ ​mind​ ​as​ ​you​ ​develop​ ​your​ ​solution.​ ​Also,​ ​your
chosen​ ​implementation​ ​doesn't​ ​necessarily​ ​have​ ​to​ ​be​ ​the​ ​best​ ​you​ ​can​ ​think​ ​of,
but​ ​one​ ​that​ ​you​ ​can​ ​implement​ ​in​ ​the​ ​allocated​ ​time.

Instructions
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Create​ ​a​ ​project​ ​which​ ​models​ ​the​ ​situation​ ​below.
The​ ​language​ ​used​ ​should​ ​be​ ​Ruby​​ ​(unless​ ​previously​ ​agreed​ ​otherwise).
All​ ​code​ ​should​ ​be​ ​tested​ ​following​ ​TDD​.
A​ ​README​​ ​file​ ​must​ ​be​ ​attached​ ​explaining​ ​your​ ​implementation.
Create​ ​a​ ​.zip​ ​with​ ​your​ ​code​​ ​and​ ​git​​ ​directory.
Answer​ ​our​ ​email​ ​with​ ​the​ ​zip​​ ​of​ ​the​ ​project.

Background
The​ ​software​ ​you​ ​write​ ​in​ ​this​ ​test​ ​will​ ​be​ ​used​ ​for​ ​banks.​ ​Banks​ ​have​ ​accounts.
Accounts​ ​hold​ ​money.​ ​Transfers​ ​can​ ​be​ ​made​ ​between​ ​accounts.​ ​Banks​ ​store​ ​the
history​ ​of​ ​transfers.
There​ c
​ an​ ​be​ ​two​ ​types​ ​of​ ​transfers:
• Intra-bank​​ ​transfers,​ ​between​ ​accounts​ ​of​ ​the​ ​same​ ​bank.​ ​They​ ​don't
have​ ​commissions,​ ​they​ ​don't​ ​have​ ​limits​ ​and​ ​they​ ​always​ ​succeed.
• Inter-bank​​ ​transfers,​ ​between​ ​accounts​ ​of​ ​different​ ​banks.​ ​They​ ​have​ ​5€
commissions,​ ​they​ ​have​ ​a​ ​limit​ ​of​ ​1000€​ ​per​ ​transfer.​ ​And​ ​they​ ​have​ ​a​ ​30%
chance​ ​of​ ​failure.

Part​ ​1
Create​ ​the​ ​models​ ​and​ ​their​ ​relationships​ ​to​ ​accurately​ ​reflect​ ​banks,​ ​accounts
and​ ​transfers.​ ​Make​ ​sure​ ​that​ ​new​ ​types​ ​of​ ​accounts​ ​and​ ​transfers​ ​can​ ​be​ ​added
to​ ​the​ ​bank​ ​with​ ​minimal​ ​effort.

Part​ ​2
After​ ​modeling​ ​the​ ​domain(part​ 1
​ ),​ ​create​ ​a​ ​file​ ​called
show_me_the_money.rb*​​ ​in​ c
​ harge​ ​of​ ​reproducing​ ​the​ ​next​ ​situation:
Jim​ ​has​ ​an​ ​account​ ​on​ ​the​ ​bank​ ​A​ ​and​ ​Emma​ ​has​ ​an​ ​account​ ​on​ ​the​ ​bank​ ​B.​ ​Jim
owes​ ​Emma​ ​20000€.​ ​Emma​ ​is​ ​already​ ​a​ ​bit​ ​angry,​ ​because​ ​she​ ​did​ ​not​ ​get​ ​the
money​ ​although​ ​Jim​ ​told​ ​her​ ​that​ ​he​ ​already​ ​sent​ ​it.
Help​ ​Jim​ ​send​ ​his​ ​money​ ​by​ ​developing​ ​a​ ​transfer​ ​agent​.​ ​This​ ​agent​ ​assures
that​ ​everybody​ ​gets​ ​their​ ​money.​ ​When​ ​the​ ​agent​ ​receives​ ​an​ ​order​ ​to​ ​transfer
money​ ​from​ ​account​ ​A​ ​to​ ​account​ ​B,​ ​he​ ​issues​ ​transfers​ ​considering​ ​commissions,
transfer​ ​limits​ ​and​ ​possibility​ ​of​ ​transfer​ ​failures.
The​ ​execution​ ​of​ ​the​ ​script​ ​will​ ​print​ ​the​ ​balance​ ​of​ ​every​ ​account​ ​before​ ​and​ ​after
the​ ​transfers​ ​and​ ​the​ ​history​ ​of​ ​the​ ​transfer​ ​of​ ​every​ ​bank.

Questions:
Please​ ​also​ ​supply​ ​your​ ​answer​ ​to​ ​the​ ​following​ ​questions:
• How​ ​would​ ​you​ ​improve​ ​your​ ​solution?
• How​ ​would​ ​you​ ​adapt​ ​your​ ​solution​ ​if​ ​transfers​ ​are​ ​not​ ​instantaneous?
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