Embed Size (px)
DESCRIPTION
Citation preview
• Unit Of Work• Setup Methods
• Constrained vs. Unconstrained Isolation
Frameworks• Principles of Good Isolation Frameworks
• Faking Deep Legacy is OK• Six Influence Forces
• Beautiful Builds
Unit
Of
Work
Production Code
Unit Of Work
Return Value/Exceptio
n
Noticeable State Change
3rd Party call
Public API
Test
Production Code
Unit Of Work
Return Value/Exceptio
n
Public API
Assert Test
Production Code
Unit Of Work
Noticeable State Change
Test
Public API
Ass
ert
Noti
ceable
Sys
tem
Behavi
or
Change
Noticeable by a user
of the public API, at the same level of
the entry point that made the change.
ACT and ASSERT on the same level of APIs.
Production Code
Unit Of Work
3rd Party call
Test
Public API As
sert
3rd Party
Unit Of Work
Production Code
Unit Of Work
3rd Party call
Test
Public API As
sert
3rd Party
Unit Of Work
Mock
Nam
ing b
y U
nit
O
f W
ork
UnitOfWork_Input_Expect
edOutput
UnitOfWork_LogicalAction
_ExpectedChangeInBeha
vior
UnitOfWork_ActionOrInpu
t_ExepectedCallToThirdPa
rty
Nam
ing b
y U
nit
O
f W
ork
Addition_PositiveNumbers
_ReturnsSum() Addition_WhenCalled_Res
etsTheNextSum() Addition_NegativeNumber
s_CallsLogger()
Setu
p M
eth
ods
Isola
tion
Fram
ew
ork
s
Constrained vs. Unconstrained
Recu
rsiv
e F
ake
s &
C
hain
ed
Exp
ect
ati
ons
Recursive is not explicit: Person.Manager.Manager is
already a fake instance without asking for it
Chained Expectations are explicit Mock.Arrange(() => Person.Manager.Manager)
.Returns(fakeManager)
Team Agile - All rights
reserved
Unco
nst
rain
ed
Const
rain
ed
Goodbye
R
hin
oM
ock
s Hello FakeItEasy,
NSubstitute
Valu
es
of
a G
ood
Isola
tion F
ram
ew
ork
Simple Single point of entry Easy to remember Intellisense Guidance
Test Robustness Recursive Fakes non strict by default
Helpful Helpful Error Messages
No surprisesTeam Agile - All rights
reserved
Rspec style is ok
Assert multiple results on
same unit of work
LEGACY CODEFaking Deep
System Internals is OKExample - SilverUnit
Cross Cutting Fakes
Old code
Old code FakeNewcode
CROSS CUTTING FAKES
Impacting
Change
6 in
fluence
fo
rces
Personal Ability Motivation Social Ability Motivation Environmental Ability Motivation
Anoth
er
book?
Tools
Pex – yes Moles (ms fakes) – NO
JustMock - Maybe Nuget – YES Chocolatey – YES
TeamCity – YES FinalBuilder – YES Ruby and Rake – Maybe
Amazon AWS agent hosting –
YES Git for very small commits -
YES
Build and
Delivery
Build Patterns
Build
Scr
ipt
Inje
ctio
n Allow version aware builds Build scripts are part
of source control Build configurations on
the CI server are dumb
triggers
Ext
ract
Scr
ipt
Extract Script
Build Chain Triggers
Triggered by checkin
Triggered by end of previous
Manual
Manual
Build Chaining
• Unit Of Work• Setup Methods
• Constrained vs. Unconstrained Isolation
Frameworks• Principles of Good Isolation Frameworks
• Faking Deep Legacy is OK• Six Influence Forces
• Beautiful Builds
