Software Testing Slides

1. Software Testing Lab
(Lab 7 & 8)
By: Ms. Aroosa Hameed
DEPARTMENT OF SOFTWARE ENGINEERING (DSE)
Foundation University Rawalpindi Campus (FURC)

2. Lab Agenda
• Unit Testing
• What is NUnit
• NUnit
 Introduction
 Setup
 Configuration
• Example (Test case)
• Exercise
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3. What is unit testing
• Unit testing is a software testing method by which individual units of source code
are tested to determine whether they are fit for use.
• Units are:
Functions.
Methods.
Class.
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4. Unit Testing (Cont.)
• Intuitively, one can view a unit as the smallest testable part of an application.
• Unit tests are short code fragments created by programmers during the
development process.
• It forms the basis for component testing.
• When we test individual function behavior without touching any other functions
and determine whether it works exactly as per the requirements or not that is
called Unit Testing.
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5. Unit Testing (Cont.)
• Some of the advantages of Unit Testing:
 Defects found early in development life cycle
 Reliable Code
 Maintainable code
 Faster testing by only single click of action
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6. NUnit
• NUnit is a unit testing framework.
• It is the most used framework for writing unit test cases.
• Test Assemblies:
 It is suggested to write testing code in different assemblies called Test
Assemblies. These assemblies only contain testing code nothing else.
 We need to run these test assemblies to check whether all test cases are
passed or failed.
 For that we required Test Runner.
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7. NUnit
• Test Runners are UI tool which actually run NUnit test cases and show the result
of test cases whether they are passed or failed.
• NUnit is very easy to use. It only provides some custom attributes and some static
Assert classes.
• With the combination of custom attributes and static classes, we can write unit
test cases easily.
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8. NUnit
• Custom attributes provides hint to NUnit test runners that these classes or
functions contains unit testing code.
• Assert classes is used to test the conditions whether system under test (SUT)
satisfy a condition or not.
• If condition is satisfied then test is pass else fail.
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9. NUnit
• Some of the custom attributes are:
 TestFixture
 Setup
 TearDown
 Test
 Category
 Ignore
 TestCase
 Repeat
 MaxTime
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10. NUnit Setup
• There are two steps in configure NUnit project environment:
1. Configure Project with NUnit assemblies
2. Setup TestRunners which show the results of NUnit test cases
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11. NUnit Setup
• We always creates separate project when creating project for NUnit.
• According to naming conventions test project name should be [Project Under
Test].[Tests].
• For example, if we are testing the project name "CustomerOrderService" then
test project name should be "CustomerOrderService.Tests"
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12. NUnit Setup (Configuring Nunit Assemblies)
1. Visual Studio -> New Project -> Class Library -> Name: CustomerOrderService
2. Right click on solution -> Add New Project -> Class Library -> Name:
CustomerOrderService.Tests
• In CustomerOrderService project, we write code for business logic
• In second project CustomerOrderService.Tests we write test cases for
CustomerOrderService project.
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13. NUnit Setup (Configuring Nunit Assemblies)
• Right click on CustomerOrderService.Tests and choose "Manage NuGet
Packages".
• In NuGet search box, Choose Browse tab and type Nunit in search textbox.
• Choose NUnit and click on Install button.
• NUnit assembly (nunit.framework) is added to our test project.
• Add reference of our CustomerOrderService class library to test project.
• Choose add reference in test project -> Project - Solution tab -> Mark the
checkbox before the CustomerOrderService -> Click on OK button.
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14. NUnit Setup (Configuring Nunit Assemblies)
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15. NUnit Setup (Configuring TestRunners)
• For setup TestRunners, we need to add Nunit Test Adapter from NuGet packages.
Follow the below steps:
1. Right click on CustomerOrderService.Tests and choose 'Manage NuGet
Packages'
2. Choose NUnit3TestAdapter and click on Install button.
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16. NUnit Setup (Configuring TestRunners)
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17. NUnit
Test Case:
A set of statements executed by a tester to determine if the program
under test behaves as expected.
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18. NUnit
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19. NUnit
• Test case is composed of three parts
• Test Data
• Test Sequence
• Test Oracle
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20. NUnit
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• Test data is :
• A set of values, one for each input variable
• Input given to a software program

21. NUnit
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22. NUnit
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• Order of execution of test case is Test sequence.
• Test oracle:
The entity that perform task of checking correctness of observed
behavior.

23. NUnit
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24. NUnit
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You have to develop a small program that reads three integer values
from console. The three values represent the lengths of the sides of a
triangle
The program first checks if the triangle is valid. Condition for valid
triangle:
• Sum of any two sides should be greater than the third side
Write a set of test cases to properly test the program