Software testing is the method of verification and evaluation of the software. It ensures that the program or application is free of defects and viruses. It also ensures that the program meets the requirements of the end-user as planned and developed. It ensures that the program meets the requirements of the customer effectively and efficiently and also manages all exceptional and restricted situations.
What is Embedded Testing?
Embedded testing is a method for the verification and evaluation of both software and hardware. It ensures that the whole device, including software and hardware, is free of defects. It’s essentially done on hardware to find the flaw. It also ensures that the device meets the specifications of the end-user.
Embedded applications software testing is very much in common with application software testing. Thus, much of this two-part article is a description of common test principles and terminology. However, there are significant variations between the testing of software and the testing of embedded systems. Embedded developers also have access to hardware-based test resources that are not commonly used for application development.
Embedded automation systems also have specific characteristics that should be expressed in the test plan. These variations tend to give embedded systems a distinctive taste of their own. This article deals with the fundamentals of test and test case creation and points out specifics that are specific to the built-in systems that function along the way.
Hardware and software are incorporated into embedded systems to perform a specific purpose, with a microcontroller/microprocessor usually serving as a “brain” controlling the intended action.
In embedded testing, the functional behavior of embedded hardware or software is checked and validated to provide proof that it fulfills its intended functions and is robust. Testing plays a critical role in development, as end-users cannot be able to change the fundamental software or control hardware components.
Embedded device testing is a rigorous process that can be time-intensive and labor-intensive. Manual testing is costly, error-prone, and it may be difficult to replicate manual testing. Software that can automate testing can improve process productivity and save costs. Tool automation also allows tests to run in a continuous integration environment, minimizing the effort required to find and correct any bugs identified during software development.
As such, using a software automation tool is a positive step on the path to implementing a rigorous testing plan as good tools save developer’s time and lower project costs. We’ve listed some essential features to look out for when choosing the built-in embedded software testing tools below.
1. On-target and on-site monitoring
Embedded applications may be checked either on the goal or on the host. In on-target testing, the program is being checked on the hardware to be deployed (the target). In on-host testing, the program is evaluated on a host computer that has a different hardware environment than the final application.
On-target testing is important as the behavior of the software often depends heavily on the hardware environment in which the software is hosted. However, on-target testing is often more costly than on-site testing and needs access to the target hardware. In certain applications, however, access to the final target hardware may not be readily accessible and may only be available late during software development.
On-host testing is typically less resource-intensive than on-target testing and offers a way to conduct tests even when the hardware is not readily available. This has many advantages, including that testing can be automated and run continuously during software development and that testing can be carried out off-site.
2. Unit, integration and testing of the system
Embedded software can be evaluated at different granularity levels, reflecting conditions that closely match the final framework in which the software will be hosted. Among other aspects, unit testing, integration testing, and device testing are also used.
Unit testing requires testing individual framework modules in isolation, i.e. without communicating with other modules or external dependencies, such as databases. As unit testing involves only a subset of software, it allows testing to begin early in the production of software. Unit tests are also automated to run during development as a series of regression tests that can detect mistakes made during development.
Integration testing requires checking whether the components are functioning properly when they are combined. This offers a broader scope for testing, and bugs that are introduced as a result of module interactions are usually found during integration testing.
Device testing requires ensuring that the whole integrated program is operating correctly.
3. Analysis of the structural code coverage
Structural code coverage is a measure used to assess the completeness of software testing. The higher the percentage of coverage obtained when testing a system, the lower the chance of software having unintentional features, missing tests, or specifications.
- Coverage of function
- Statement of coverage
- Coverage of decision (branch)
- Coverage of changed state of decision (MC/DC)
When choosing an embedded testing method, the higher the granularity of coverage testing you conduct, the more reassurance you will provide that your program does not include unintended features.
4. Analysis of scheduling
Scheduling Analysis offers a summary of when tasks are done, enabling embedded testers to get an image of program flow and task response times. This research often helps engineers to see how many specific incidents occur in their applications. Rare timing events, such as race conditions or deadlocks, can be detected, examined, and resolved from this information.
5. Continuous integration:
Continuous integration servers are also used to monitor software development over time. If an automated test tool can communicate with the continuous integration server that is being used, tests can be performed dynamically with each new program revision.
There are several challenges in testing embedded software that make testing more difficult than normal software testing. The most important issue is the close dependency on the hardware environment that is prepared at the same time as the software and that is frequently needed to conduct accurate software testing.
One of the most important things you need to think about is that you should always opt for automated software testing. Embedded automated testing is a simpler process that would take a few hours to complete, and then the problem of your program is resolved.