A testing method to find defect in an application when multiple users are logged in is known as concurrency testing. In other words monitoring the effect while multiple users perform the same action at the same time. Concurrent testing is also referred as multi-user testing. Testing concurrent program is more challenging then testing sequential program, due to non-determinism and synchronization issues.

Why concurrency testing

• Defines the impact of simultaneously accessing the same database entries, modules, or application code.
• Determines and quantifies the amount of deadlocking, locking, use of single-threaded code, and limiting access to shared resources.

Advantages of Concurrency Testing

• By restricting the scope of concurrent interactions to a few widely used well-tested components, It relatively reduces the amount of effort needed to test an application
• Encapsulation value enables program behavior analysis on a subset of the program without examining the complete program or code.
• It helps in improving the reliability and robustness of concurrent programs.

Disadvantages of Concurrency Testing

Disadvantages that might be encounter by test while performing concurrent testing

• Need to test on multiple platforms
• Requires more intensive tests
• Testing is more challenging since functions can send their results via notifications, blocks, callback functions, or other similar mechanisms rather than immediately returning them to the caller.
• The information or program flow is not reflected in the call stack.
• The number of execution paths in the system can be extremely large as such the processes in a concurrent system can interact with each other while they are executing
• The failure rate of concurrent programs is higher than that of sequential ones.
• Debugging of concurrent programs

Concurrency test techniques:

1. Code review: The embedded code and its structures are verified during this process. This is a time-consuming process.
2. Static Analysis: Before the code is executed, the coding system is checked and assessed using static analysis. It is helpful for finding mistakes and mistakes in the system.
3. Fuzz Test: In this test, inaccurate random data is inputted by the user, and the application is then tested to see how it reacts. The fuzz test is more than simply a guess because incorrect data is used to cause the software to crash; there is no logic behind it.
4. Con Test: Contest fixes multi-threaded Java applet sync issues. The competition also identifies issues with the unit test.
5. Reachability testing: Usually, it necessitates extensive subtests; reachability testing is typically not feasible for many applications.
6. Random Test: By generating test inputs at random, the coverage area is expanded. Simultaneous testing is conducted on several strands.
7. Concurrent Test Extension: This is a tool for testing concurrent or multi-threaded software. Using permutation techniques, this form of test is easily expandable and consumable. The combo test works well for the serial program test without extension.

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Author: STEPS