What is the difference between bug and defect in testing?

Asked By: Mehmet Blaj | Last Updated: 23rd June, 2020
Category: technology and computing databases
5/5 (117 Views . 9 Votes)
A bug is a fault in a program which causes it to behave abruptly. Bugs are usually found either during unit testing done by developer of module testing by testers. A defect is found when the application does not conform to the requirement specification. A defect can also be found when the client or user is testing.

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Also to know is, what is difference between bug and defect in software testing?

Testing is the process of identifying defects, where a defect is any variance between actual and expected result . “A mistake in code is called Error . ” Error found by tester is called defect , Defect accepted by development team is called Bug . And build does not meet the requirements then it is Failure .

Furthermore, what is a bug in testing? A “Bug” is a most unwelcomed word in the software development process. A bug indicates a fault, error or failure in the software/system being built that produces unexpected results. A bug identified needs to be tracked and fixed to ensure optimum quality in the software/system being developed.

Then, what's the difference between a bug and a defect?

“A mistake in coding is called Error, error found by tester is called Defect, defect accepted by development team then it is called Bug, build does not meet the requirements then it Is Failure.” In other words Defect is the difference between expected and actual result in the context of testing.

What is a code defect?

A defect is a deviation from the requirements That is: A defect does not necessarily mean there is a bug in the code, it could be a function that was not implemented but defined in the requirements of the software. From the Wikipedia page on software testing: Not all software defects are caused by coding errors.

36 Related Question Answers Found

Which testing is performed first?

Usually unit testing is performed first by dev team. After it is completed, and units are ready to be integrated, integration testing is provided by the QA team.

What is bug life cycle?

Defect life cycle, also known as Bug Life cycle is the journey of a defect cycle, which a defect goes through during its lifetime. It varies from organization to organization and also from project to project as it is governed by the software testing process and also depends upon the tools used.

What is Agile methodology in testing?

A software testing practice that follows the principles of agile software development is called Agile Testing. Agile is an iterative development methodology, where requirements evolve through collaboration between the customer and self-organizing teams and agile aligns development with customer needs.

What is defect example?

The definition of a defect is an imperfection or lacking that causes the person or thing with the defect to fall short of perfection. An example of a defect is a genetic condition that causes weakness or death. An example of a defect is faulty wiring that results in a product not working.

What are the types of errors in software testing?


Common Categories of Software Errors:
  • #1) Functionality Errors:
  • Functionality is a way the software is intended to behave.
  • #2) Communication Errors:
  • These errors occur in communication from software to end-user.
  • #3) Missing command errors:
  • This happens to occur when an expected command is missing.
  • #4) Syntactic Error:

What is defect log?

Defect logging, a process of finding defects in the application under test or product by testing or recording feedback from customers and making new versions of the product that fix the defects or the clients feedback.

How unit testing is done?

UNIT TESTING is a type of software testing where individual units or components of a software are tested. The purpose is to validate that each unit of the software code performs as expected. Unit Testing is done during the development (coding phase) of an application by the developers.

What is meant by system testing?

System Testing. SYSTEM TESTING is a level of software testing where a complete and integrated software is tested. The purpose of this test is to evaluate the system's compliance with the specified requirements. Definition by ISTQB.

Why is testing necessary?

Testing is required for an effective performance of software application or product. It's important to ensure that the application should not result into any failures because it can be very expensive in the future or in the later stages of the development.

What is bug in Jira?


Jira Software (software projects) issue types
Bug. A bug is a problem which impairs or prevents the functions of a product. Epic. A big user story that needs to be broken down.

What are defects in agile?

A defect is when a Product Backlog Item (PBI) does not meet the acceptance criteria. The PBIs and their acceptance criteria are owned, managed, and prioritized by the Product Owner. Thus, logically, the Product Owner is the ultimate arbitrator of defects.

What is error defect failure?

Error, Fault, Failure
Error – a human action that produces an incorrect result. Fault – a manifestation of an error in software, also known as Defect or Bug. Failure – a deviation of the software from its expected delivery or service.

What is a bug in Scrum?

Scrum is a framework which gives you a lot of space to customize the process within its limits. There is nothing said about how to size a story or a bug in the Scrum guide. There is not even a notion of a User Story. Sizing bugs is one of them. Bug is something that doesn't work.

What is smoke and sanity testing?

1. Smoke testing means to verify (basic) that the implementations done in a build are working fine. Sanity testing means to verify the newly added functionalities, bugs etc. are working fine.

What are the different status of bug?


Some of the familiar values used for defects, during their life cycle are: New, Assigned, Open, Fixed, Retest, Reopened, Deferred, Rejected, Duplicate, Closed, Not a bug (by-design).

What are the seven testing principles?

There are seven principles in software testing:
  • Testing shows presence of defects.
  • Exhaustive testing is not possible.
  • Early testing.
  • Defect clustering.
  • Pesticide paradox.
  • Testing is context dependent.
  • Absence of errors fallacy.

What is the importance of bugs in software testing?

Testing software is always a step in the right direction. Effective bug testing by customers/clients will force the programmer to improve code quality and security in future products; that's why we must tolerate and thank the software task forces out there that make software vulnerabilities public, such as BUGTRAQ.