What is Non-Functional Testing? Types with Example

What is Non-Functional Testing?

Non-functional Testing is a method of software testing that examines a software application's non-functional attributes (productivity, compatibility, functionality, and many more). It is intended to assess a system's preparation based on nonfunctional conditions that never get covered by functional tests.

A good example of a non-functional test is seeing how many users would sign into a program at the same time.

Non-functional testing is almost as critical as functional testing, and it has an effect on customer satisfaction.

We will discover the following in this tutorial−

  • Non-functional testing objectives
  • Non-functional testing Characteristics
  • Testing for non-functionality variables
  • Software Testing Types
  • Types of Non-functional Testing
  • Test Case Examples of Non-Functional Testing

Non-functional Testing Objectives

  • Non-functional testing can improve the product's reliability, performance, manageability, and accessibility.
  • Reduces the probability and cost of manufacturing related to noncomponents of the commodity.
  • Improves the way the product is installed, configured, executed, controlled, and tracked.
  • Measurements and metrics should be collected and generated for internal analysis and development.
  • Develops and reinforces your understanding of the product's actions and the technology that is being used.

Non-functional testing Characteristics

  • Non-functional testing ought to be quantitative, but arbitrary characterizations such as fine, great, greatest, and so on have no room.
  • At the outset of the specification procedure, exact quantities are impossible to be determined.
  • It is essential to keep the specifications as the topmost priority.
  • Guarantee the consistency characteristics are properly defined in Software Engineering.

Testing for non-functionality variables

  • Security: The parameter specifies how a system is protected from intentional and unintentional threats by both internal and external sources. Security Testing is used to validate this.
  • Reliability: The degree to which a software system executes the required tasks consistently and without error. Reliability Testing is used to validate this.
  • Survivability: The parameter ensures that the computing system runs smoothly and restores in the event of a system malfunction. Recovery Testing verifies this.
  • Availability: The parameter specifies how much the user can rely on the machine when it is running. Stability Testing verifies this.
  • Usability: The convenience with which a user can read, perform, and plan inputs and outputs by contact with a machine. Usability testing verifies this.
  • Scalability: The concept refers to the extent to which a software application's computing power may be expanded to satisfy increased demand. Scalability Testing is used to validate this.
  • Interoperability: This non-functional parameter validates the interactions of a software system with other software systems. Interoperability Testing verifies this.
  • Efficiency: The degree to which a software system can manage power, volume, reply variations, and duration.
  • Flexibility: The concept refers to how quickly and easily the program can run in various hardware and software setups.
  • Portability: The ability of software to shift from its existing hardware or software setting.
  • Reusability: It refers to a piece of software that can be adapted to be used in another program.

Software Testing Types

In general, there are three types of testing−

  • Functional
  • Non-Functional
  • Maintenance

There are several testing levels in all categories of testing, but they are commonly referred to as Testing Types. The above definition can vary slightly in various books and study guides.

The following list is not exhaustive and there are over 100 different types of testing and increasing. No need to be concerned; you will learn them when you advance in the research industry. Also, keep in mind that not all research types are applicable to all programs, but rather rely on the purpose and scale of the project. More about this in a subsequent tutorial.

Types of Non-functional Testing

Following are the most common types of Non-Functional Testing −

  • Performance Testing
  • Load Testing
  • Failover Testing
  • Compatibility Testing
  • Usability Testing
  • Stress Testing
  • Maintainability Testing
  • Scalability Testing
  • Volume Testing
  • Security Testing
  • Disaster Recovery Testing
  • Compliance Testing
  • Portability Testing
  • Efficiency Testing
  • Reliability Testing
  • Baseline Testing
  • Endurance Testing
  • Documentation Testing
  • Recovery Testing
  • Internationalization Testing
  • Localization Testing

Test Case Examples of Non-Functional Testing

Following are examples of Non-Functional Testing −

Test Case No.Test CaseDomain
1Up to 1000 users running the application at the same time, the application load time should not exceed 5 seconds.Performance Testing
2Software should be installable on all versions of Windows and MacCompatibility Testing
3All web images should have alt tagsAccessibility testing