Negative Testing

Negative testing
Software development is by no means a child's play. It is all about writing long and intricate codes and then testing these complex codes to guarantee flawless and uninterrupted performance. Testing is a major feature of writing successful codes. Any cost cutting in testing phase will lead to a malfunctioning software which is the surest way to disaster. In this article, we shall discuss a unique testing technique known as Negative Testing.

What Is Negative Testing?

Negative Testing is a technique wherein the response of the software is evaluated when unexpected parameters are entered. In simpler terms, during Negative Testing, the performance of the application is tested using invalid data inputs. For example, numbers are entered in alpha-numeric fields and vice-versa. Similarly, skipping mandatory fields can also be a part of this test. In an ideal scenario, during such times, the application should show the error "Invalid data input".

Characteristics of Negative testing

Here, we are providing, some of the key features of the negative testing, which may be seen, as under:

  • It is done, with the purpose, of breaking the system, and to achieve a failure, in the functioning of a software product, by feeding negative data.
  • This type of testing, evaluates a software product, against the failed conditions.
  • It is, performed, to identify faults or loopholes and vulenrable areas, which may results, into software's failure.
  • It, is done, to ensure the stability of a software product, after being encountered with the input values, beyond the limit/scope or with the invalid input data.
  • Generally, the task of carrying out the negative testing, is being executed, by a tester.
  • It is, used, to assess the potential security breaches and exceptional handling mechanism.

Necessity Of Negative Testing

Quite often Negative Testing is also known as Error Path Testing or Failure Testing. The aim of this type of testing is to ensure suitable and optimum software performance even when the user behaves irrationally by entering invalid and inappropriate data. The idea is to help the user correct his or her error while entering incorrect data and guiding them to identify and rectify the said mistake. This makes for a stronger and more user-friendly application. As such, every software development firm that wishes to have a strong and competent software needs to undertake rigorous Negative Testing as well.

Benefits Of Negative Testing

It is quite an obvious fact that Negative Testing is beneficial for the final product launch. Although, the basic purpose of negative testing, is to make a software, function undesirably and differently from its expected working, on feeding with the invalid inputs, with the intention of break intothe system, but what may be other benefits, may be assimilated from the points mentioned below:

  • Functional Reliability Is Verified – Even under stress the software needs to perform within specified parameters. Negative Testing provides a chance to check the software for unexpected behaviours when the data variables are also inconsistent. This way corrective action can be taken timely and makes for increased reliability of the final product.
  • Ensures Error Validation – Negative Testing increases the likelihood of covering all bases and all types of errors that can arise due to erratic human behavior. This leads to easy anticipation of all problem areas and prevents any unnecessary crashes. Also, this helps in validating errors and building appropriate responses that can guide the user towards the right path.
  • Makes For A Better Software – When the performance of the software remains unhindered even during those times when the data entered is incorrect, it makes for a better final product. Such a software is considered to be user-friendly and hence a potential hit.


Many a times people live under the misconception that Negative Testing is one more way of increasing expenses without any conceivable benefits. This ideology is fatal as it can compromise the quality of the final product. So, if you want to aim high, then it is best to never underestimate the power of any testing technique. Enforcing Negative Testing will make your software stronger and improve its quality as well.