Beginners - Get started with unit testing in .NET. Introduction to unit testing and mocking.. List of unit testing frameworks available in .NET - NUnit, xUnit.net, Visual Studio unit test framework. List of mocking frameworks available in .NET - Moq, Rhino Mocks, FakeItEasy, NSubstitue, JustMock, and TypeMock. Introduction to Visual Studio Unit Testing Framework, NUnit and xUnit.net.

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2. What is Unit Test?
● Unit – Smallest piece of testable code (like
functions, method, procedure and class)
● Unit Testing – Process of testing the
correctness of each testable unit of code by
isolating it from external dependencies.

3. Why Unit Testing?
● Helps to eliminate the bug during the
development stage
● Helps to reproduce production bugs
● Helps to debug the code
● Helps to re-factor the code with confidence
● Helps to improve the code coverage
● Helps to improve the code and design
● Helps to automate the testing process

4. Unit Testing Frameworks for .NET
● NUnit – Open Source Unit Testing framework for .NET
initially ported from JUnit. URL: http://www.nunit.org/
● xUnit.net – Open Source Unit Testing framework written by
original inventor of NUnit v2. URL: https://xunit.github.io/
● Visual Studio Unit Testing Framework – Reference the
namespace “Microsoft.VisualStudio.TestTools.UnitTesting”
● Gallio/MbUnit – Unit Testing Framework for .NET. Note:
mbunit-v3 last released in Aug-2013.
URL: https://github.com/Gallio and
https://code.google.com/archive/p/mb-unit/

5. Visual Studio Unit Testing
Introduction to Unit Testing
using
Visual Studio 2015

6. Create a Class Library project
● Create a C# Class Library project
New > Project > Templates > Visual C# > Windows > Class Library
●

7. Add Unit Test Project
● Create a new unit test project
Add New Project > Templates > Visual C# > Test > Unit Test Project
● Namespace : Microsoft.VisualStudio.TestTools.UnitTesting
● Attribute - [TestClass]
● Attribute - [Test Method]

8. Arrange, Act and Assert - AAA
● Reference the Class Library Project in the Unit Test Project
● AAA – Arrange, Act and Assert in [TestMethod]

9. How to Run Unit Tests?
● Open Test Explorer – Test > Windows > Test Explorer
● Test Explorer - Click Run All

10. How to test exception?
● Attribute - [ExpectedException]
● CalculateAvgSalary method
● Test Method

11. Additional Test Attributes
● [ClassInitialize], [ClassCleanup], [TestInitialize], [TestCleanup]

12. Introduction to NUnit
Introduction to Unit Testing
using
NUnit

13. Add Unit Test Project
● Add a new C# Class Library “SampleLibrary.NunitTests”
Add New Project > Templates > Visual C# > Windows > Class Library
● Rename the class Class1.cs as “SalaryCalculatorTest.cs”

14. Open NuGet package Manager
● Right Click Project > Manage NuGet Packages

15. Install NUnit
● Install NUnit

16. NUnit References
● NUnit References

17. Add NUnit – Unit Test Method
● Equivalent of [TestClass] is [TestFixture]
● Equivalent of [TestMethod] is [Test]

18. Install NUnit 3 Test Adapter
● Go to Tools >Extensions and Updates > Online
● Search for NUnit 3 Test Adapter > Download

19. Run the NUnit – Test Cases
● Go to Test > Windows > Test Explorer and click Run All

20. xUnit.net - Unit Testing
Introduction to Unit Testing
using
xUnit.net

21. Create Unit Test Project
● Create a C# Class Library “SampleLibrary.XunitTests”
Add New Project > Templates > Visual C# > Windows > Class Library
● Rename the class Class1.cs as “SalaryCalculatorTest.cs”

22. Open NuGet package Manager
● Right click project > “Manage NuGet Packages”

23. Install xUnit.net
● Install xUnit.net

24. xUnit.net - References
● References made by xUnit.net

25. Create xUnit – Unit Test
● Decorate the test method with [Fact]

26. Add xunit.runner.visualstudio
● Go to NuGet Package manager
● Add xunit.runner.visualstudio

27. Run the xUnit – Unit Tests
● Go to Test > Windows > Test Explorer and click Run All

28. Mocking
Introduction to Mocking

29. What is Mocking?
● Unit testing aims to test the smallest possible
testable unit of code by isolating external
dependencies (like calls to database, web
services, email service etc)
● Mocking helps to replace the external
dependencies while unit testing
● Mocks, Stubs and Fakes are used in Mocking

30. Advantages of Mocking
● Helps to run the unit tests faster by reducing
the execution time
● Helps to write the unit tests without depending
on external services / components
– No need to setup the database to unit test the code
dependent on database access layer (DAL).
– No need to setup the real service to unit test the code
dependent on service layer
– No need to setup the SMTP / email server to unit test the
code dependent on SMTP and mail server.

31. Mocking Frameworks for .NET
● Moq - Simple to use, strong typed and minimalistic mocking framework
URL: https://github.com/Moq/moq4/wiki/Quickstart
● FakeItEasy – The easy mocking library for .NET
https://fakeiteasy.github.io/
● NSubstitute - A friendly substitute for .NET mocking framework URL:
http://nsubstitute.github.io/
●
Rhino Mocks - Dynamic mock object framework for the .Net platform. URL:
https://www.hibernatingrhinos.com/oss/rhino-mocks
● JustMock - .NET Mocking framework from telerik URL:
http://www.telerik.com/products/mocking.aspx
● Typemock – Smart Unit testing Solutions for .NET URL:
http://www.typemock.com/

32. What is TDD / TFD ?
● TDD – Test-driven Development
● Write unit test before writing fully functional
code (Test-First Development - TFD)
● Unit test fails to start with
● Write the code to satisfy and pass the test
case.

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