What is a Test case in Software Testing? | Detailed Explanation

In this FAQ post, we will talk about the much-asked question "what is a test case in software testing" and why it is important in a software development environment.

What is a Test Case in Software Testing?

A test case is a set of instructions that test a specific function. Test cases are written by the software tester, who then uses them to verify that the software works as expected. For example, let's say you're testing a software application that lets users create loan applications for small businesses. You want to make sure your business can handle requests from customers and fill out the forms correctly so they can be approved easily. To do this, you would write out several test cases for each step in filling out an application:

  • What happens when I click "Create?"
  • How do I fill out my name and address?
  • How do I enter payment information?
  • Are there any errors or problems with my form?

The test case is defined as a group of conditions under which a tester determines whether a software operation is working as per the client's conditions or not. Test case designing includes preconditions, case names, input conditions, and anticipated results. A test case is a first-position action deduced from test scripts. It's an in-details document that contains all possible inputs( positive as well as negative) and the navigation way, which are used for the test prosecution process. Writing test cases is a one-time attempt that can be used in the future at the time of retrogression testing. 
So, what is a test case in software testing? They are conditions that give detailed information about testing strategy, testing process, preconditions, and anticipated affairs. These are executed during the testing process to check whether the software operation is performing the task for that it was developed or not. 
Test case helps the tester in disfigurement reporting by linking disfigurement with test case ID. Detailed test case attestation works as a full evidence guard for the testing platoon because if the inventor missed a commodity, also it can be caught during the prosecution of these full-evidence test cases.  To write the test case, we must have the conditions to decide the inputs, and the test scripts must be written so that we don't miss out on any features for testing. Also, we should have the test case template to maintain uniformity, or every test mastermind follows the same approach to prepare the test document. 

Types of test cases

1. Function Test Cases serve the purpose to write a program that will fail in expected ways while verifying that the program behaves correctly. The function test is useful when changes are made to the function being tested. The function test is useful when changes are made to the function being tested. They are useful in the following situations:

  • When changes are made to a function and you want to be sure that your program behaves correctly.
  • After a bug is fixed, you still want to verify that it's been fully removed from the codebase.
  • When you've decided that an old feature should no longer be used, but want to make sure there aren't any bugs lurking around in its place.

2. An integration test case is a set of related tests that run as a series to make sure the software module or system works correctly. Integration test cases should be written and run with every build, even if no new features are being tested. Integration testing helps us identify problems early in the software development process before they become costly problems for your customers.

An integration test case should be written and run with every build. It should be as important as any other unit test, and it should be run with every build. Integration tests are not just an afterthought or an add-on to your development process—they're critical to making sure that your code works as expected across multiple environments, including production.

3. System test cases are a way to map out the various layers of functionality in your application. You can use system test cases to verify that every major piece of functionality is working, and they can also be used for continuous improvement. When you create a system test case, you're essentially mapping out the various layers of functionality in your application. You can then use these test cases as a guide to verify that every major piece of functionality is working. This process allows you to make sure that all parts of your app are working together properly and that no pieces have been left out or not covered by testing elsewhere.

Why do We Write the Test Cases?

The purpose of test cases is to ensure that the client, developer, and QA team understand how well the application works. This can be done by writing a set of test cases that model all possible use cases for your system and then running them against your software under different conditions. The test cases are also an excellent way for developers to see what needs to be changed in their codebase before they release it into production.

While it's important to write the test cases, it's equally important to know why. The test cases are written so that the client can see how complete and stable the application is, and what it's capable of. They also help us understand better why we built certain things so that we can improve our work in the future. A good example of this would be code coverage reports: they show how much of your code has been tested by someone else (or yourself). In some cases, this might not be enough information because there could be bugs in other parts of your program that haven't been tested yet - which means there may still be bugs lurking around.

The most common reason why developers don't notice things about how their code behaves until they see an error report is that they're busy. A developer might not be able to see every piece of code running in their test environment, especially if many tests are being run simultaneously (which is not uncommon). In this case, it's important for you as the tester to write down any issues that come up so that your developer will be aware of them.

When we talk about writing test cases, we mean that each step should have its independent test case—and some steps may even require multiple tests! It's important here not just because it improves reliability but also because it makes sure that developers know what's going on with each part of the system before moving on to another part of the system or building off previous knowledge gained during development work.


This brings to conclude our article on the topic of "what is a test case in software testing". Writing test cases helps you understand what your code is supposed to do. If a developer is not familiar with all the intricacies of working with a piece of software, they may not notice something about how it behaves until they see an error report that shows them what went wrong. This can be particularly true when dealing with APIs and other low-level components; in these cases, it's easy for things to go wrong without your knowledge or consent.

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