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What Is Loop Software Testing

by support@1lyqa.com

In this article, have a look at various types of loop testing, advantages, and disadvantages of loop testing.

Loop testing is a type of software testing that examines the loop constructs for accuracy. Control Structure Testing has a component for path testing, validation testing for incorrect data, and condition testing for various scenarios.

An example of white-box testing is Loop Testing. This technique is one sort of control structure testing and is used to test software loops.

Why Do Loop Testing

We carried out a loop test for the following reasons:

  • Testing can assist in resolving the observation of loop repeating.
  • Loop testing can be used to forecast performance and facility conditions.
  • Testing loops can detect the loop’s uninitialized variables.
  • It facilitates the classification of loop starting problems.
  • Testing has the potential to close the loop on routine issues.
  • Loop testing can indicate limitations in production or capabilities.
  • Its purpose is to categorize the loop’s initial requests.

Types of Loop Test

Different types of Loop Software Testing are as below:

  1. Simple loop
  2. Nested loop
  3. Concatenated loop
  4. Unstructured loop

Read in the brief about types of loop testing here:

Simple Loop

Simple loop testing is a type of testing that involves only one loop. In simple loops, “for,” “while,” or “do-while” loops are commonly used, in which we specify a condition and the loop runs and terminates based on whether the condition is true or false. The purpose of this type of testing is to verify the loop’s various conditions. The simple while loop’s syntax is given below.

Simple Loop

Steps of how a simple loop is tested are as below:

  • Neglect the whole loop.
  • Make only one pass over the loop.
  • Make a greater number of passes through the loop where a<b, where the maximum limit of passes is n.
  • Make b, b-1; b+1 passes through the loop, where the highest number of passes is the “b” through the loop allowed.

Nested Loop

Nested loop testing refers to testing that takes place in a loop that has loops underneath it. A Nested loop is defined as a loop that has a finite number of loops within it. It could be a do-while loop, for example. The nested loop has the following syntax.

Nested Loop

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

  • Adjust all the other loops to their minimum value and start with the deepest loop.
  • Start a simple loop test on the innermost loop and keep the outside loops at their minimum iteration parameter value.
  • Conduct the test for the following loop and make your way outwards.
  • Keep testing till reached the outermost loop.

Concatenated Loop

Testing done using the concatenated loop is known as Concatenated loop testing. It is performed on the concatenated loops. One loop is followed by another in a concatenated loop. It’s a looping chain of one type. The distinction between a nested and a concatenated loop is that a nested loop has one loop inside another, and a concatenated loop has one loop after another.

If two loops are assessed as independent of one another in concatenated loops, they are both tested as simple loops or nested loops.

We cannot consider the loops to be independent if one loop counter is utilized as a beginning value for the others.

Concatenated loop

Unstructured Loop

The unstructured loop is made up of concatenated loops and nested loops. It’s just a collection of loops that aren’t in any particular order.

Unstructured loops must be reconstructed to show the use of structured programming approaches.

Unstructured loop

Advantages and Disadvantages of Loop Testing


  • It limits the number of repetitions of the loop.
  • It assured that the program doesn’t go into an infinite loop process.
  • It is endures starting of every used variable inside the loop.
  • It is used in the identification of different problems inside the loop.
  • It is used in the assurance of capacity.


  • It is most effective in bug detection in low-level software.
  • It is not useful in bug detection.

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