by
Ersan BİLİK

unit : smallest testable part of

an application
an individual program

 a function
 a procedure
 a method..
 depends on your viewpoint !

test: a means of determining the presence, quality or

truth of something
determining “the unit” works as it is promised to?

 determining the quality of “the unit” ?
 determining the truth about “the unit” ?

Unit Testing : a procedure used to validate that

individual units of source code are working properly.
unit testing itself, is a procedure

unit testing applies to individual units

unit tests build-on to source code

 to ensure source code is working properly

Unit testing is a white

box approach in
testing activity
usually, it is

integrated with
implementation phase
but also, it depends
on your software
development life
cycle..

PROS CONS
isolation of units go to definition: it
 
refactoring code applies to individual

units, therefore it can
simplifies integration

not guaranty the overall
documentation

system will work !
seperation of interface

from implementation it only shows the

presence of errors, not
a good habit: motivator

for decoupled, cohesive absence of errors..
code bodies, refactored
with design patterns..

Manually..

step by step instructional document..

Automated tools

frameworks are available..

usually called xUnit frameworks..


we will investigate test driven development

methodology with nUnit framework based on
Microsoft .NET

an approach for software development

actually, itself is not a lifecycle model, but an

approach for implementation phase for agile
software lifecycles..
it is a bottom-up approach..

think: write tests first, then code necessary

instructions to pass your tests..

yes, first write a test case.

then build it.. it will fail because no code

written to pass the test
implement your code as long as test case is

passed..
and voila..! YAGNI : you aint gonna need it. So,

you code as much as you need..
then think about it, how to do it better ?


is the code satisfies my requirements ?

lets assume requirements sais: if a customer

wants to transfer money, minimum balance for
the customer should be 10.00$
so, lets continue..


mock objects and their usage in unit testing..


Check out Behaviour

Driven Development
Watch video of Dave

Astels
( co-author of “A

practical guide to
eXtreme
Programming” and
author of award
winning test-driven
development: a
practical guide)

any questions or comments ?
