A software testing technique called “fault injection testing” introduces mistakes into a system on purpose to see if it can survive them and recover. Prior to deployment, fault injection testing is frequently performed to find any potential flaws that might have been introduced during production. Fault injection testing is used, like stress testing, to find specific flaws in a hardware or software system, so they can be rectified or avoided.

Either compile-time injections or runtime injections can be used for software fault injection testing. Using the compile-time injection technique, software testers can simulate software system errors by altering the source code. These adjustments can be made by updating the existing code, such as by changing a line of code to reflect a different value. Additionally, testers can modify code by entering new lines of code or new logic values.

A software trigger will be used by runtime injection to start injecting a bug into the software while it is active. A time-based trigger is one that can be programmed to introduce a defect at a particular time. Trap mechanisms, which halt program at a certain point in the code or during a specific system event, can also be used to set triggers. As an interrupt-based trigger, this is what it is. The testing method of fault injection can simply be compared to chaos engineering. The difference with fault injection is that it needs a particular strategy to test a single condition. Injecting faults will imitate hardware failures like circuit board shorts; hence fault injection testing can also be used on hardware.

Benefits

Benefits to fault injection testing include:

• Added software resilience.
• Allows developers to see the results of bugs or errors before they occur naturally in production.
• Allows developers to make changes to previously unknown issues before release.

Tools

Although tools can be used to aid automate the process, fault injection can be done manually and doesn’t need them. Using the testing tool Library-level Fault Injector (LFI), for example, defects will be automatically found and faults will be introduced between libraries and applications. Another automated tool for injecting errors into memory and disk access is the Fault Tolerance and Performance Evaluator (FTAPE). The Xception tool can also aid in automating the use of software triggers, which cause problems to be stored in memory.

Fault injection Methods:

• Compile-Time Injections – This method of injecting problems into a system involves changing the source code.
• Run-Time Injections – This technique uses a software trigger to introduce a bug into a running software system.

There are two different sorts of triggers: interrupt-based triggers and time-based triggers.

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Author: STEPS