Unit Testing using NunitIntroduction to Art of Testing

Presenter:Gaurav Arora

Email: admin@hyderabadtechies.infoNote: This presentation is presented with courtesy of HyderabadTechies.info

Topics

What is unit testing?

Step-by-step Overview

What is Nunit?

Hands-on using Nunit

What is unit testing?

Unit Testing is a way/method by which individual units of source code/application are tested to determine if they are fit for use.

In other words, we can say method by which individual test one thing at a time [i.e. units] without touching external sources [DB, external files, libraries etc.]

Who is responsible for testing?

Primarily job for Unit Testing is completely for Developers. But, when we talk about Quality or testing then it would be a different answer.

• Everyone who is a developer• Everyone who is a team member• Even it’s the responsibility of

customer

Main benefits of unit testing

Main goal of unit testing to make sure that each and every tested part [i.e. unit] is correct. In Test-Drive-application -

Helpful in writing Smaller, tighter,

decoupled code

Helpful in Documentation of

requirements

What do you need?

1. Testing framework

NUnit, MSTest, MbUnit

2. Test runner

NUnit, MSTest, ReSharper

3. Mocking framework

Rhino Mocks, Moq, TypeMock

Why to choose NUnit?A generally asked question, there is a lengthy discussion and story for this, due to shortage of time, we can’t go with topic.Here are some links, go and grab the answer of this question :http://osherove.com/blog/2010/3/5/nunit-vs-mstest-nunit-wins-for-unit-testing.htmlhttp://stackoverflow.com/questions/3678783/mbunit-vs-nunithttp://stackoverflow.com/questions/261139/nunit-vs-mbunit-vs-mstest-vs-xunit-net

What is Nunit?

Nunit is unit-testing framework and supports all .Net languages. It has been written entirely in C# [csharp].

Refer - http://www.nunit.org/

Start with NunitBefore start, we need nUnit framework:

Download from :http://www.nunit.org/index.php?p=downloadhttp://sourceforge.net/projects/nunit/

[after download, install per your choice, not going in details of this chapter here…]

For more info :http://www.nunit.org/

Pictorial Flow of Nunit

nUnit Dll, exe file XML file

(Optional)

Processing details on the GUI or Command prompt

Image : showing [Input & Output]

Nunit : two operational flavors

Nunit is having two operational modes:

• GUI modeGraphical user interface, nothing to type just click button and check the results.

• CUI [i.e. console] modeConsole mode, runs from command prompt, you need to write commands and check the results.

Nunit : Hands-on

Before this make sure, nunit framework has been downloaded has properly installed at your system.

• Preferable, download Nunit-2.5.10.msi

• Add references to your project• Write Test methods• Run your tests either with GUI or CUI

mode

Nunit : Hands-on… continue…

In our Test project we are going to write simple test, which will test our methods for BMI application [a simple Body Mass Index calculator].

Coming slides will tell step-by-step creation of project …

Nunit : Hands-on… BMI Test

• Start your IDE to develop .Net application. In this session we are using VS2010

• Select a Class Library project [why choose class library, we are creating a separate project for our tests]

• Add reference of nunit.framework.dll in your project

• Include ‘NUnit.Framework’ namespace in your project

Hands-on: BMI Test

Hands-on: BMI Test-Structure

Usin

gTest ClassTestFixture Attribute

Setup attribute

TearDown

attributeTest

attribute

Hands-on : Points of interestIn previous slide we notified :• Test class is named with *Tests• Method names are long, defining

scenarios• Attribute TestFixture tells the fixture

of test class• Method with Setup attribute calls at

very first and TearDown calls after every TestMethod, no matters if there will be an exception

Hands-on : ‘AAA’ methodNunit ‘AAA’ method is nothing but

• Arrange :arrange objects, creating and setting them up as necessary

• Act :Act on an object

• AssertThat something is expected

Lets take a look on Code!

Nunit : CUIConsole mode is one of the modes available of Nunit, lets discuss how to run from command [console window]:

The command to execute the exe in console mode is

nunit-console.exe [filename] [option]

Nunit : CUI - Output

Nunit : CUI - Options*Options

/Fixture=STR Fixture to test/config=STR project configuration to load/XML=STR Name of XML output file/transform=STR name of transform file/xmlConsole display XML to the console/output=STR File to receive test output (short

:/out=STR) /err=STR File to receive test error output/labels Label each test in stdout/include = STR list of categories to include/exclude = STR list of categories to exclude/noshadow disable shadow option/thread runs thread on a separate thread/wait wait for input before closing

console window /nologo Do not display the logo/help Display help (short format: /?)

Nunit : GUI

Go to your installed path of nunit framework and from bin folder select ‘nunit.exe’

If you installed nunit from msi package just go to program and select Nunit

Nunit : Load Test

Nunit : Test Result

Lets take a look on Nunit GUI

References

• “Art of Unit Testing” - Roy Osherove• “Test-Driven Development in Microsoft .NET” – James

Newkirk• “Pragmatic Unit Testing in C# with NUnit” – Andy Hunt, Dave

Thomas

Thanks