Unit Testing
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This document provides an overview of unit testing, covering its definition, benefits, best practices, and considerations for effective implementation. It includes a practical session on writing unit tests using the NUnit framework, along with an example exercise related to the FizzBuzz problem. Additionally, references for further reading on unit testing and related methodologies are listed.
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Nunit Overview
[TestFixture]
public class TestFixtureLifetime
{
[TestFixtureSetUp]
public void BeforeTest()
{
// single set of functions that are performed once prior to executing any of the tests in the text fixture
}
[TestFixtureTearDown]
public void AfterTest()
{
// single set of functions that are performed once after to executing any of the tests in the text fixture
}
[Test]
public void Test1()
{
int expectedResult=4;
int actualResult =squareRoot(16);
Assert.AreEqual(expectedResult,actualResult,”Error Message”)
}
}](https://image.slidesharecdn.com/unittesting-140823233933-phpapp02/85/Unit-Testing-10-320.jpg)
Unit Testing
- 1. Unit Testing Gayani Tennakoon Software Engineer@ 99XTechnology
- 2. The partner of choice for ISV's Plan for Today • What is Unit Testing • Why Unit Tests • Best Practices for effective Unit Testing • Considerations in Unit Testing • Nunit overview • Writing Unit Tests – Practical Session • Exercise..
- 3. The partner of choice for ISV's What is Unit Testing
- 4. The partner of choice for ISV's Unit Testing • Developers do unit testing • Write a code to test a small specific area of functionality • It helps to prove the functionality
- 5. The partner of choice for ISV's Why Unit Tests • Better Code • Better Design • Code is easier to maintain later • Confidence when you code • Make your life easy
- 6. The partner of choice for ISV's Best Practices for Effective Unit Testing • Use Good Tools Testing Focused Tools –Nunit, MsTest,Test Driven .NET Supporting Tools -Ms Build, Resharper • Use a Test List • Get a Mentor • Automate Your Test Execution
- 7. The partner of choice for ISV's Considerations in Unit Testing What to test You need to answer “If the code ran correctly, how would I know?” You can test • Test at the boundaries • Test every error message • Test different configurations • Run tests that are annoying to setup • Avoid redundant tests
- 8. The partner of choice for ISV's Considerations in Unit Testing Test Structure William Wake’s 3-A Pattern – Arrange – Act – Assert Designing For Test “How am I going to test this ?”
- 9. The partner of choice for ISV's Nunit Overview • Open source Unit Testing framework • Attributes • indicate test classes and methods • modify behavior of classes and methods • Assertions • test an actual value against expected value
- 10. The partner of choice for ISV's Nunit Overview [TestFixture] public class TestFixtureLifetime { [TestFixtureSetUp] public void BeforeTest() { // single set of functions that are performed once prior to executing any of the tests in the text fixture } [TestFixtureTearDown] public void AfterTest() { // single set of functions that are performed once after to executing any of the tests in the text fixture } [Test] public void Test1() { int expectedResult=4; int actualResult =squareRoot(16); Assert.AreEqual(expectedResult,actualResult,”Error Message”) } }
- 11. The partner of choice for ISV's Nunit Overview • Learn more about Nunit go to http://www.nunit.org
- 12. The partner of choice for ISV's Its Time To Write Some Unit Tests
- 13. The partner of choice for ISV's Exercise • Write a program that prints the numbers from 1 to 100. But for multiples of three print “Fizz” instead of the number and for the multiples of five print “Buzz”. For numbers which are multiples of both three and five print “FizzBuzz”. • Write unit tests for your implementation • You will be given 15 min.
- 14. The partner of choice for ISV's References http://bradwilson.typepad.com/presentations/effe ctive-unit-testing.pdf http://www.testdriven.com http://www.xprogramming.com http://workspaces.gotdotnet.com/tdd
- 15. The partner of choice for ISV's References • The Pragmatic Programmer Andy Hunt and Dave Thomas • Test-Driven Development in Microsoft .NET Jim Newkirk and Alexei Vorontsov • Test-Driven Development, by Example Kent Beck • Pragmatic Unit Testing in C# with NUnit Andy Hunt and Dave Thomas • Working Effectively With Legacy Code Michael Feathers • Refactoring Martin Fowler • Lessons Learned in Software Testing Cem Kaner, James Bach, and Brett Pettichord
- 16. The partner of choice for ISV's Thank You !