Unit testing with NUnit

Unit Testing with NUnit
Ron Klein
http://heblog.ronklein.co.il
http://tinyurl.com/ronklein

Agenda
Introduction to Unit Testing
Basic Examples with NUnit
Why Unit Testing?
Advanced Features (if we have time)

Introduction to Unit Testing
Tests
Tests
Tests
Code

What's a Unit?
Unit == class || method
Unit != classes.Count > 1

How to test?
Manually? –possible, but not so friendly
Automated Frameworks:
NUnit
MSTest
MbUnit
etc.

Testing Framework
A set of code and tools to test existing code
Testing code is decorated with attributes
Testing Framework uses Reflection to invoke testing code
Most tests either Passor Fail

Demo – Array Util
The task:
A method has 2 input parameters:
A non empty, sorted array of integers
An integer
The output should be the closest number from the array to the input number.
"Closest" in terms of absolute value
Try to write it yourself!

Why Unit Testing?
Unit Testing is a STANDARD
No need to manually test code by console applications
Accepted by Developers
Expected by Developers
Fearlessly Change Implementation

Why Unit Testing?
(back to demo)

Why Unit Testing?
Leads us to Better Code / Better Design
Demo: Greet example

I Can't Test That Code
More than a single class is used
Even worse: Singletons are used
Hardware boundaries:
System Clock
HTTP Requests
File Read/Write
Refactor!

Unit Testing
More code to test our code
Unit Testing Leads to:
Better Code / Better Design
If a class can't be tested – consider refactoring
Legacy code is code without tests

Resources
NUnit: http://nunit.org/
Moq: http://code.google.com/p/moq/

Thank You!

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Unit testing with NUnit

by kleinron on Aug 05, 2011

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Unit testing with NUnit — Presentation Transcript