NUnit

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NUnit A Unit Test Framework for .Net under Mono

• Pavan Upadhya
• pavan.upadhya_at_hp.com

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Scope

• Not a tutorial
• Gives high level picture
• May prompt the audience to give it a try if not
  already done it.

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Topics

• A quick look at Mono.
• What is NUnit ?
• Features
• Writing a Unit Test
• Code Examples
• Pros and Cons
• Conclusion

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Mono

• The Mono project is sponsored by Novell
• It is designed to implement the .NET Development
  Framework standard across various platforms.
• It is open source code.

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What is NUnit?

• NUnit is a unit-testing framework for all .Net
  languages.
• It is written entirely in C.
• NUnit is much the same as all the Extreme
  Programming test frameworks (xUnits)
• NUnit was initially ported from JUnit.

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Features

• NUnit is simple to understand and easy to learn.
• Object Oriented.
• NUnit is flexible - Test code can be in any .Net
  language.
• NUnit uses the "attribute" feature of .NET to
  identify tests.

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Features (Cont.)

• NUnit provides a rich set of assertions.
• Has both Console and GUI interface.
• Can be called from NAnt as a task.

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Writing a Unit Test Code

• Every Class must have a corresponding Test Class
  named TestClassName
• One test method per public method, named
  testMethodName.
• In each test method, test good results and
  failures
• Every Test Class must have the attribute
  TestFixture
• Each Test Method must have the attribute Test

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Writing a Unit Test Code (Cont..)

• Other Attributes include
• SetUp / Teardown
• ExpectedException ( typeof( Exception))
• Explicit
• Ignore

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Example (sample C source)

• namespace bank
• public class Account
• private float balance
• public void Deposit(float amount)
• balanceamount
• public void Withdraw(float amount)
• balance-amount
• public void TransferFunds(Account destination,
  float amount)
• destination.Deposit(amount)
• Withdraw(amount)
• public float Balance
• get return balance

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Sample test code (in C)

• namespace bank
• using NUnit.Framework
• TestFixture
• public class TestAccount
• Account source, destination
• TestFixtureSetUp
• public void init()
• Account source new Account()
• Account destination new Account()
• Test
• public void TestTransferFunds()
• source.Deposit(200.00F)
• destination.Deposit(150.00F)
• source.TransferFunds(destination, 100.00F)
• Assert.AreEqual(250.00F, destination.Balance)
• Assert.AreEqual(100.00F, source.Balance)

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TestCode (Exception handling)

• namespace sample
• using NUnit.Framework
• TestFixture
• public class SuccessTests
• Test
• ExpectedException(typeof(InvalidOperationExcep
  tion))
• public void ExpectAnException()
• / ... /

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Pros

• NUnit is Open Source and highly extensible.
• Platform independent.
• Simple and easy to learn syntax.
• When integrated with NAnt, can be used for
  incremental projects.

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Cons

• C based extensions not available.
• Lack of awareness among .Net Community.

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Resources

• http//www.nunit.org
• http//www.xprogramming.com/xpmag/acsUsingNUnit.ht
  mN74

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Questions