Beginners - Get Started With Unit Testing in .NET

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Beginners -
Get started with Unit Testing in .NET
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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.

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

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/

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

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

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]

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

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

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

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

Introduction to NUnit
using
NUnit

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”

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

Install NUnit
● Install NUnit

NUnit References
● NUnit References

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

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

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

xUnit.net - Unit Testing
using
xUnit.net

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”

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

Install xUnit.net
● Install xUnit.net

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

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

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

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

Mocking
Introduction to Mocking

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

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.

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/

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.

Thank you
HOPE YOU ENJOYED
DO YOU HAVE ANY QUESTIONS?
WANT TO LEARN NUnit or xUnit.net?
WANT TO LEARN ABOUT MOCKING?
GET IN TOUCH FOR FREE WEBINAR
ContactUs@CloudCubeSoftware.com
www.cloudcubesoftware.com

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