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Importance of Software Testing in SDLC

Feb 10, 2023
8 min read

With the increasing complexity of software applications and the constantly evolving user requirements, it has become critical to ensure that the software is free from defects and works as intended. Trying to resolve these issues at a later stage can incur substantial costs, that’s why software testing is one of the most critical processes of the system development life cycle (SDLC).

Software testing helps to improve the overall quality of the product and ensure that their product fulfills the end-users or the business needs. In this blog post, we will discuss the role of testing in the SDLC and explore the different stages that are commonly used to ensure the quality and reliability of software applications.

Software Development Life Cycle (SDLC)

The software development life cycle or SDLC is a framework that outlines the processes and activities involved in developing an application, from the planning stage to the deployment. The SDLC consists of several stages, typically including requirements analysis and validation, designing the product architecture, software development, testing, deployment, and maintenance.

Each stage of the SDLC has specific goals, objectives, and deliverables that must be completed before moving on to the next stage. The SDLC provides a structured approach to software development, ensuring that the final product meets the desired requirements, is of high quality, and is delivered on time and within budget.

Different Models of SDLC

Software team can choose any of many software development life cycle models during their projects. Each model contains a series of unique steps that the team has to follow to complete the project.

01 Waterfall Model

The Waterfall development model follows a linearly sequential flow. In this framework, the requirement analysis, designing, development, integration, testing, and deployment phases are clearly defined in separate phases and none of these phases overlap each other. The project workflow only proceeds forward, and teams cannot begin one phase before the preceding ends. However, once a team has progressed beyond, they cannot go back to the prior stage.

It is one of the earliest models derived by software engineers but is rarely used today. One of the major uses of this model is in projects that don’t have changing requirements and require extensive documentation.

02 V-Shaped Model

The V-shaped is similar to the waterfall model in many ways. However, one significant change in how the testing of software components is planned.

The project does not follow a downward trend towards completion. Instead, the process turns upwards after the development phase and testers use the test plans created earlier to evaluate specific components of the product. The shift starting from the development phase allows forming a typical V-shape.

03 Iterative and Incremental Model

The iterative and incremental model is designed to overcome the weaknesses of linear models like a waterfall. Once the planning stage is completed, the project is tackled through a series of iterations where developers code software components and deliver them incrementally.
In these models waterfall methodologies are implemented at the granular level.

04 Agile Model

The agile model is centered around the iterative and incremental approach and cross-functional teams work in collaboration.

These projects require constant engagement with clients and are able to handle changing requirements more effectively than other models. Less time is spent in requirement analysis and more emphasis is given on practical feedback from customer after using developed software components.

Software Testing in Agile

To give you a better idea how testing can be integrated in SDLC we will break down how it works in agile model. In agile development, every component of the software development life cycle is optimized for speed and efficiency. This is why testing also needs to have its own life cycle (STLC) to ensure every component of application has been verified in terms of quality.

Let us look at each step closely:

Step 01 Requirement Analysis

Requirement analysis is the initial step of the software testing lifecycle, where the testing team evaluates the demands and determines how they will test the system. In case of any confusion, the testers can consult with customer, system architect, or business analyst. Understanding the KPIs comprehensively helps identify software faults more efficiently.

System specifications can be either functional or non-functional, which means that the testers need to check both functional business features and metrics like speed, reliability, availability, and security. Therefore, testers need to define the types of checks required, prioritize goals, and create a requirement traceability matrix (RTM). Additionally, they must provide information about where the testing will be performed and apply an automation feasibility analysis if needed.

Step 02 Software Testing Planning

Software testing is a joint work that involves the entire team, and the planning of the process is typically led by senior engineer or the project manager. This stage of the QA life cycle results in important documents such as Effort Estimation and Test Plan. The primary goal of this procedure is to outline the effort and cost estimates for the project.

During this stage, senior engineers or managers are responsible for preparing the test plan for different types of software testing, selecting the most suitable testing tools, and evaluating effort estimation. Additionally, they need to assign responsibilities and roles to their team members. The test plan outlines the project strategy, objectives, environment, schedule, and testing deliverables. It also identifies potential risks and provides a mitigation plan.

Step 03 Test Case Development

On this step, the team creates test cases and corresponding scripts based on the specific features and their requirements. They need to verify and refine the test cases, as well as gather and create the data necessary to execute the tests. The quality and completeness of the cases and scripts are essential for ensuring that the software is thoroughly tested and any issues are identified and resolved before the release.

Step 04 Environment Setup

The test environment includes hardware and software specifications necessary for testing, which should mimic the end-user’s working scenarios. The testing team is responsible for setting up and checking the readiness of the environment through smoke testing. Knowledge of its architecture, software, and hardware specifications is essential for the project.

Step 05 Software Test Execution

On the test execution phase, specialists perform testing based on the plans and cases created by the senior engineers or project managers. They verify if all requirements in the RTM match and report any errors found to the developers. After all testers document all test results and log failed cases, link bugs with relevant test cases in the RM, and track these bugs until closure.

Step 06 STLC Closure

The final phase of software testing involves a team meeting where they review and analyze the documentation to optimize their testing strategies. This phase aims to provide feedback on any issues faced during the software development life cycle and establish best practices for similar projects in the future.

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Software Testing in SDLC by PFLB

Identifying errors only in the last stage of SDLC is not an efficient practice. Companies have various daily activities to focus on, and dedicating too much time to testing and fixing bugs can hinder efficiency.

PFLB had provided software-testing services to over 500 companies across all industries, from finance and retail to healthcare and technology. Our team of experienced engineers will carry out each step of the SDLC to identify all possible bugs in your application. And if you need an extended support, we can offer annual support as an option.

Let us handle your software testing needs so that you can concentrate on other critical business operations. Contact us and find out how much your business can save with PFLB!

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