What is Loop Testing(Methodology, Example)?

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Loop Testing is a kind of software testing that focuses exclusively on the correctness of loop constructions. It is a component of Control Structure Testing (path testing, data validation testing, condition testing).

Loop testing is an example of white-box testing. This approach is used to test software loops.

Types of Loop Tests

The following are some examples of loop tests −

  • Simple loop

  • Nested loop

  • Concatenated loop

  • Unstructured loop

Why Loop Testing?

Following are some of the reasons why loop testing is performed −

  • Testing can help to resolve loop recurrence concerns.

  • Loop testing can indicate constraints in efficiency and operations.

  • The loop's uninitialized variables can be identified by testing loops.

  • It aids in the identification of loop initiation issues.

How to do Loop Testing − Complete Methodology?

It must be tested at three separate stages within the testing loop −

  • When the loop is activated.

  • When the loop is executed.

  • When the loop is terminated.

The following is the testing technique for all of these loops −

Simple Loop

The following is how a simple loop is tested −

  • Ignore the entire loop.

  • Make a single pass across the loop.

  • Make a number of passes through the loop where a<b, n is the maximum limit of passes.

  • Make b, b-1; b+1 passes through the loop, where "b" is the highest amount of passes through the loop allowed.

Nested Loop

You must perform the following steps to create a nested loop −

  • Adjust all the other loops to their smallest value and begin with the innermost loop.

  • Initiate a simple loop test on the innermost loop and keep the outside loops at their smallest iteration parameter value.

  • Conduct the test for the following loop and make your way outwards.

  • Keep testing till the outermost loop is reached.

Concatenated Loops

If two loops in a chained loop are free of one other, they are checked as simple loops; otherwise, they are tested as nested loops.

However, if the loop counter for one loop is utilized as the starting value for the others, the loops are no longer considered separate.

Unstructured Loops

For unstructured loops, the architecture must be restructured to represent the use of structured programming techniques.

Limitation in Loop testing

  • Loop issues are especially common in low-level applications.

  • The flaws discovered during loop testing are not significant.

  • Numerous defects may be identified by the operating system, resulting in storage boundary breaches, identifiable pointer failures, and so on.


  • Loop testing is a type of White Box testing in software engineering. This approach is used to evaluate loops in the program.

  • Loop testing can indicate constraints in functionality and operations.

  • Loop issues are especially common in low-level applications.

Updated on 09-Jun-2021 12:49:22