TDD is a scrum engineering practice that helps in writing quality code and has in-built regression testing to ensure good code quality.

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Introduction to Test
Driven Development
Naveen Singh, PMP, PMI-ACP, CSP, CSM
Agile Coach and Trainer

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Unit Testing
Test Driven
Development
Unit testing
Framework
Code Sample

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What is Unit Testing

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Unit Test
A unit test is to test one unit of work. Generally one unit
means of one requirement for one method.

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Unit Test Characteristics

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Test Driven Development
TDD was introduced long
back in 1999 as part of
eXtreme Programming
(XP) by a group of
developers.
Basic philosophy is
“Before you write code,
think about what it will
do”.

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Test Driven Development
Testing code once will not ensure future
changes will not impact to earlier tested code so
TDD is something you write once but run once,
twice, three times etc.
TDD is risk averse programming, investing work
in the near term to avoid failures later on.

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TDD Cycle
Write a
test
Compile
Fix
compilat
ion error
Run
Test
Write
Code
Run test
Refactor
code

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Benefits

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Benefits

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Misconceptions

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Unit Test Framwork
Before Unit Test Framework
developers were using message
box/new window to verify the
output of code.
Later on developers moved on
console based testing and it
was better than previous but still
there was no common way of
writing and executing test
cases.

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NUnit
NUnit is the most popular unit testing
framework for Microsoft .Net platform.
NUnit is based on JUnit a java-based
unit testing tool.
NUnit is stable, easy to use, and
executes quickly.
NUnit is easy to learn and has
become a standard tool in almost
every TDD practitioner’s toolbox.

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NUnit – Important links
http://www.nunit.org
http://nunit.org/download.html
http://sourceforge.net/projects/nunit/

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NUnit - Input & Output
NUnit
Dll, exe file XML file
(Optional)
Processing details
on the GUI or
Command
prompt

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NUnit - Input & Output
Time to write TDD based code
for given scenarios
1. Display largest value from an
array
2. UserBLL class should return
text in below at after login
Hello Mr. Joe, Age – 39

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Naveen Singh
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