Application Quality Using Test-Driven Development (TDD)

What we’ve seen so far, whilst sound Software Development TDD practices, hasn’t resulted in much demonstrable code. We know that BookIndex is going to manage a collection of zero or more instances of the class Book, so it stands to reason that we might have an AddBook method. So let us set about writing the test for Add Book in Software development .
List 4 presents our new test case – remember, we must write our tests before we write any implementation code! I’ve done the simplest thing possible, added CheckAddBook that creates an instance of BookIndex, adds a book name, and then checks that the book name was added correctly. List 4 is not going to Software development .
compile – there’s no AddBook method defined, nor is there an IsMember function. 
[Test] 
public void CheckAddBook 
Book Index cbtBookIndex;
cbtBookIndex = new BookIndexcbtBookIndex.AddBook(“Methods & Tools”);
Assert.IsTrue(cbtBookIndex.IsMember(“Methods & Tools”), “Book was not added to collection!”);
This means adding the AddBook and IsMember methods to the class presents Book Index with this Software Development .
.
Modifications.
Namespace WinApp
public class Book Index
public void Add Book (string Book Name)

public boil Is Member(string Book Name)
return false;
With List 5 in place, we can re-compile the solution and re-run the test. Prepare yourself for some bad news.
Bad news, the test failed. What do we need while Software Development to do in order to fix this? What might move us in the right direction would be a change to the AddBook and the IsMember methods, and the introduction of a string called BookList, this is the simplest thing. List 6 presents the updated BookIndex class in Software Development .
Public class BookIndex

Private string BookList;
public void AddBook(string BookName)

Booklist = BookName;
Public boll Dismember (string Book Name)

Adding Two Books
We will in this write some test code that exercises adding more than one book. List 7 presents a new test that does just this:

Assert.IsTrue (cbtBookIndex.IsMember (“The Delphi Book”), “TDM was not added to 
In the testing we will use a string to manage the booklist has caused a test to fail. That is part of the Test Driven Software Development process, now tests dictate which code is developed and how it is developed. Here, CheckAddTwoBooks dictates which we require to develop a collection or list of some sort to replace the simple string. The Test Driven Software Development mantra of “red, green, refactor” seems to stand true. It is time to refactor the AddBook and IsMember methods.
Namespace WinApp

using System.Collections;
Software Development 

Private Array List Booklists = new Array List Public void Add Book (string Book Name)

Public bolo Dismember (string Book Name)

Return (BookList.Contains (BookName));
List 8: Introducing an ArrayList
After the preface of List 8, re-compiling and re-running the Software Development tests reveals Fig 9 and a green bar.

Array Lists in .NET languages are a useful mechanism Software Development which permits us to manage groups of object references, in the case strings. An ArrayList has the skill to grow as new object references are added – hence it is the perfect abstraction Software Development for managing a collection of book titles. Array Lists support useful methods such as Add, Insert, delete, and expediently for us a hold method.What we’ve seen so far, whilst sound Software Development TDD practices, hasn’t resulted in much demonstrable code. We know that BookIndex is going to manage a collection of zero or more instances of the class Book, so it stands to reason that we might have an AddBook method. So let us set about writing the test for Add Book in Software development .

List 4 presents our new test case – remember, we must write our tests before we write any implementation code! I’ve done the simplest thing possible, added CheckAddBook that creates an instance of BookIndex, adds a book name, and then checks that the book name was added correctly. List 4 is not going to Software development .
compile – there’s no AddBook method defined, nor is there an IsMember function. 
[Test] 
public void CheckAddBook 
Book Index cbtBookIndex;
cbtBookIndex = new BookIndexcbtBookIndex.AddBook(“Methods & Tools”);
Assert.IsTrue(cbtBookIndex.IsMember(“Methods & Tools”), “Book was not added to collection!”);
This means adding the AddBook and IsMember methods to the class presents Book Index with this Software Development .
.
Modifications.
Namespace WinApp
public class Book Index
public void Add Book (string Book Name)

public boil Is Member(string Book Name)
return false;
With List 5 in place, we can re-compile the solution and re-run the test. Prepare yourself for some bad news.
Bad news, the test failed. What do we need while Software Development to do in order to fix this? What might move us in the right direction would be a change to the AddBook and the IsMember methods, and the introduction of a string called BookList, this is the simplest thing. List 6 presents the updated BookIndex class in Software Development .
Public class BookIndex

Private string BookList;
public void AddBook(string BookName)

Booklist = BookName;
Public boll Dismember (string Book Name)

Adding Two Books
We will in this write some test code that exercises adding more than one book. List 7 presents a new test that does just this:

Assert.IsTrue (cbtBookIndex.IsMember (“The Delphi Book”), “TDM was not added to 
In the testing we will use a string to manage the booklist has caused a test to fail. That is part of the Test Driven Software Development process, now tests dictate which code is developed and how it is developed. Here, CheckAddTwoBooks dictates which we require to develop a collection or list of some sort to replace the simple string. The Test Driven Software Development mantra of “red, green, refactor” seems to stand true. It is time to refactor the AddBook and IsMember methods.
Namespace WinApp

using System.Collections;
Software Development 

Private Array List Booklists = new Array List Public void Add Book (string Book Name)

Public bolo Dismember (string Book Name)

Return (BookList.Contains (BookName));
List 8: Introducing an ArrayList
After the preface of List 8, re-compiling and re-running the Software Development tests reveals Fig 9 and a green bar.

Array Lists in .NET languages are a useful mechanism Software Development which permits us to manage groups of object references, in the case strings. An ArrayList has the skill to grow as new object references are added – hence it is the perfect abstraction Software Development for managing a collection of book titles. Array Lists support useful methods such as Add, Insert, delete, and expediently for us a hold method.