All About Loop Testing


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Loop testing is one type of software testing that helps to determine the authenticity of the construction of the loops. A Control Structure Testing involves path testing, condition testing,  and data validation testing. Loop testing is a significant part of Control Structure Testing. This technique is a white box testing that helps to test the loops in a program. 

The Importance of Loop Testing:

Loop tests are essential for the following purposes such as-

  • Loop testing helps to solve the repetition issues of the loops.
  • The capacity and performance of the bottlenecks can be understood through this technique.
  • This testing helps to determine the uninitialized variables in the loops.
  • In order to recognize the initialization problems of the loops, this technique is effective.

What Types of Loops Are Tested?

Generally, four different types of loops are tested through loop testing such as i) Simple Loop, ii) Nested Loop, iii) Concatenated Loop, and iv) Unstructured Loop. 

Loop Testing Methodology:

Loop testing can be done at three seperate levels such as-

  1. i) At the entrance of the loop,

  2. ii) During the execution of the loop,

iii) At the exit of the loop.

However, one needs to follow different strategies for different loops.

  1. i) Simple Loop:

The testing of a simple loop involves the following steps-

  1. a) First, you need to jump the entire loop.

  2. b) Then, you have to pass ‘1’across the loop.

  3. c) You pass ‘2’across the loop.

  4. d) After that, you need to pass ‘a’ across the loop and consider a<b and the highest number of passes is ‘n’.

  5. e) Finally, you need to pass ‘b’, ‘b-1’, and ‘b+1’across the loop and consider the highest number of allowable passes is ‘b’.

  6. ii) Nested Loop:

The steps to test the nested loop are-

  1. a) Start testing at the innermost loop while keeping other loops at a minimum value. 

  2. b) Conduct a simple loop test at the innermost loop while keeping the outer loops at their minimum value.

  3. c) This way, you need to perform the test for the next outward loop. You have to continue the test until you test the outermost loop.

iii) Concatenated Loops:

When there are two independent loops in the concatenated loops, you need to use the simple loop testing method for the loops. Otherwise, you should consider the loops as nested loops. However, the loops will not be considered independent loops if one loop refers to the initial value of other loops.
iv) Unstructured Loops:

In order to make the loops suitable for the structured programming constructs, the unstructured loops require reorganization of the design.

Limitations of Loop Testing:

There are several limitations associated with loop testing such as-

  • Loop testing can not identify subtle bugs.
  • Loop bugs mainly occur in low-level software.
  • As many bugs can cause detectable pointer errors and memory boundary violations, one mainly uses an operating system to detect the bugs. 

Although there are some limitations, loop testing is an effective way to test the loops in a program. 


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