Loadrunner
What is HP LoadRunner Testing Tool? Architecture, Components
What is LoadRunner? LoadRunner is a Performance Testing tool which was pioneered by Mercury in 1999....
Test Driven Development (TDD) is software development approach in which test cases are developed to specify and validate what the code will do. In simple terms, test cases for each functionality are created and tested first and if the test fails then the new code is written in order to pass the test and making code simple and bug-free.
Test-Driven Development starts with designing and developing tests for every small functionality of an application. TDD instructs developers to write new code only if an automated test has failed. This avoids duplication of code. The full form of TDD is Test-driven development.
The simple concept of TDD is to write and correct the failed tests before writing new code (before development). This helps to avoid duplication of code as we write a small amount of code at a time in order to pass tests. (Tests are nothing but requirement conditions that we need to test to fulfill them).
Test-Driven development is a process of developing and running automated test before actual development of the application. Hence, TDD sometimes also called as Test First Development.
In this tutorial, you will learn more about-
Following steps define how to perform TDD test,
TDD cycle defines
Some clarifications about TDD:
TDD approach is primarily a specification technique. It ensures that your source code is thoroughly tested at confirmatory level.
There are two levels of TDD
The main goal of ATDD and TDD is to specify detailed, executable requirements for your solution on a just in time (JIT) basis. JIT means taking only those requirements in consideration that are needed in the system. So increase efficiency.
TDD is very good at detailed specification and validation. It fails at thinking through bigger issues such as overall design, use of the system, or UI. AMDD addresses the Agile scaling issues that TDD does not.
Thus AMDD used for bigger issues.
The lifecycle of AMDD.
In Model-driven Development (MDD), extensive models are created before the source code is written. Which in turn have an agile approach?
In above figure, each box represents a development activity.
Envisioning is one of the TDD process of predicting/imagining tests which will be performed during the first week of the project. The main goal of envisioning is to identify the scope of the system and architecture of the system. High-level requirements and architecture modeling is done for successful envisioning.
It is the process where not a detailed specification of software/system is done but exploring the requirements of software/system which defines the overall strategy of the project.
There are two main sub-activates.
It may take several days to identify high-level requirements and scope of the system. The main focus is to explore usage model, Initial domain model, and user interface model (UI).
It also takes several days to identify architecture of the system. It allows setting technical directions for the project. The main focus is to explore technology diagrams, User Interface (UI) flow, domain models, and Change cases.
Here team must plan the work that will be done for each iteration.
This is also known as Just in time Modeling.
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Here in this example, we will define a class password. For this class, we will try to satisfy following conditions.
A condition for Password acceptance:
First, we write the code that fulfills all the above requirements.
Scenario 1: To run the test, we create class PasswordValidator ();
We will run above class TestPassword ();
Output is PASSED as shown below;
Output:
Scenario 2: Here we can see in method TestPasswordLength () there is no need of creating an instance of class PasswordValidator. Instance means creating an object of class to refer the members (variables/methods) of that class.
We will remove class PasswordValidator pv = new PasswordValidator () from the code. We can call the isValid () method directly by PasswordValidator. IsValid ("Abc123"). (See image below)
So we Refactor (change code) as below:
Scenario 3: After refactoring the output shows failed status (see image below) this is because we have removed the instance. So there is no reference to non –static method isValid ().
So we need to change this method by adding "static" word before Boolean as public static boolean isValid (String password). Refactoring Class PasswordValidator () to remove above error to pass the test.
Output:
After making changes to class PassValidator () if we run the test then the output will be PASSED as shown below.
Developers test their code but in the database world, this often consists of manual tests or one-off scripts. Using TDD you build up, over time, a suite of automated tests that you and any other developer can rerun at will.
In the absence of any team member, other team members can easily pick up and work on the code. It also aids knowledge sharing, thereby making the team more effective overall.
Though developers have to spend more time in writing TDD test cases, it takes a lot less time for debugging and developing new features. You will write cleaner, less complicated code.
Summary:
This article is contributed by Kanchan Kulkarni
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