Composition & Unit testing with MS test

Agenda
Composition vs Inheritance?
Examples
Unit testing
TDD
Creating MS Test project
Assert class
Examples

Composition vs Inheritance
Object Composition is a way to combine simple objects or data types into more complex ones.
Inheritance is a way to form new classes by using classes that have already been defined.
Composition realizes ”has a” relationship: A car "has an" engine, a person "has a" name, etc.
Inheritance realizes ”is a” relationship. A car "is a" vehicle, a student "is a" person, etc.

Example 1. Point and Triangle

Example 2. Slide, Presentation

Task-Homework 1
Create struct Point:
- fields x and y,
- method Distance() to calculate distance between points
- method ToString(), which return the Point in format "(x,y)"
Create class Triangle:
- fields vertex1, vertex2, vertex3 of type Point
- constructors
- methods Perimeter(), Square(), Print()
In the Main() create list of 3 triangles and write into console the information about these shapes.
*Print the triangle with vertex which is the closest to origin (0,0)

Unit testing with MS test

Unit Testing
Unit testing is a procedure used to validate that individual units of source code (methods, properties, classes) are working properly.
Unit tests
Production Code

Test-Driven Development (TDD)
The traditional way of writing unit tests
Test-driven development

Unit-testing frameworks
UTF for .NET:
MSTest
NUnit
XUnit
…

Creating Unit Tests

Kinds of Assert Classes
Microsoft.VisualStudio.TestTools.UnitTesting namespace:
class Assert
In your test method, you can call any number of methods of the Assert class, such as Assert.AreEqual(). The Assert class has many methods to choose from, and many of those methods have several overloads.
class CollectionAssert
Use the CollectionAssert class to compare collections of objects, and to verify the state of one or more collections.
class StringAssert
Use the StringAssert class to compare strings. This class contains a variety of useful methods such as StringAssert.Contains, StringAssert.Matches, and StringAssert.StartsWith.

public static class Assert

Example 1. Testing Bank project

Create project and Unit test example
1. Create project MyCalcLib
2. Right click on Solution
Add
Test “MyCalcTests”
3. Right click on References
Add References
project “MyCalcLib”

Create project and Unit test example
After this click Build Solution