A use case is a method of identifying, articulating, and arranging systems requirements in software development. Based on the use case, software functionality is developed by engineers. A use case is a tool for defining the required user interaction. If you are trying to create a new application or make changes to an existing application, several discussions are to be made. One of the critical discussions you have to make is how you will represent the requirement for the software solution. Business masters and developers must have a mutual understanding of the requirement, as it’s very difficult to accomplish. Any standard method for structuring the communication between them will really be a boon. It will, in turn, reduce the miscommunications and here is the place where Use case comes into the picture.
What is a Use Case?
A use case is a description of a particular use of the system by a user. It is used widely in developing tests at the system or acceptance level. A use case is made up of a set of possible sequences of interactions between systems and users in a particular environment and related to a particular goal. It consists of a group of elements that can be used together in a way that will have an effect larger than the sum of separate elements combined. A well-written case must have the following characteristics;
- Model the user goals when using the software
- Record the scenarios that bring the user to the goal
- Denote the main course of actions, as well as alternatives
- Organize functional requirements
- Be multi-level and utilize the functionalities of other use cases
Use cases describe the process flows through a system based on its most likely use. This makes the test cases derived from use cases particularly good for finding defects in the real-world use of the system (i.e. the defects that the users are most likely to come across when first using the system)
What is Use Case Testing?
The Use Case testing technique helps in identifying test cases that cover the entire system, on a transaction by transaction basis from start to finish. Use Case testing ensures the important user journeys or important user path are working fine on the system. It is a type of complimentary testing and it does not provide the entire coverage of the applications. Let us now move on to understand the characteristics of use case testing.
Here are the attributes of use case documents in a software testing
- Organizing functional necessities
- Use case models the objectives of system/performer connections
- Use case scenario paths from trigger occasions to objectives
- Use case software testing procedures portray one principle stream of occasions
- It is effective in defining the scope of acceptance testing
- The use case will find out the defects in integration testing
Hence, with the help of use case testing we do and test the end to end flow of all the transactions (positive test case) and also cover the alternate flows (negative test case) based on the user action and system action.
Applicable Testing Levels for Use Case Testing
There are three main testing levels, namely,
- System Testing
- Acceptance Testing
- Performance Testing
Benefits of Use Case Testing
Use case testing provides some functionality which is used to help develop software projects. They are as follows;
- Use cases start from a very simple view that a system is built first and foremost for its users.
- Use cases are a sequence of steps that describe the interactions between the actor and the system.
- Use case help to capture the functional requirements of a system
The main advantage of use case testing is that it helps testers addressing the customers need. Because of the basis for this testing is the use cases, which is nothing but the real transaction users performing. This can sometimes turn into a major weakness of this technique too. In such cases, the use case may not reflect the actual usage scenarios.
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