Understanding Condition Coverage in Software Testing

Cover Image for Understanding Condition Coverage in Software Testing
Arindam Majumder
Table of Contents


Condition Coverage is a popular testing technique that provides insights into the percentage of branches executed during testing.

In this article, we'll explore what is Condition Coverage, Its importance, How it works, and many more!

So Without delaying further, let's Start!

What is Condition Coverage?

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Condition coverage in software testing is also known as Predicate Coverage. It guarantees that testing includes the execution of both branches in a decision, like an if statement. If a decision point has different conditions (using AND or OR), Condition coverage makes sure we've tested all the different combinations of conditions.

Condition Coverage = (Number of tested conditions / Total number of conditions) * 100
This metric gives a percentage that indicates the proportion of branches executed during testing.

Let's understand this with an example:

function checkNumberSign(number) {
    let result;

    if (number > 0) {
        result = "Positive";
    } else if (number < 0) {
        result = "Negative";
    } else {
        result = "Zero";

    return result;

In this function we have a decision point with three conditions:

  1. number > 0 (positive)

  2. number < 0 (negative)

  3. number === 0 (zero)

For complete condition coverage (100%), ensure that your test cases cover all potential outcomes of these conditions.

How it Works:

Now, Let's Understand how condition coverage actually works!

  1. Firstly, it finds parts of our code where it makes decisions, like using "if" statements.

  2. Then Understand each condition in the data points and Break them down into simpler parts.

  3. Create tests that cover both sides of each condition โ€“ what happens when it's true and when it's false

  4. It runs all our tests and generates a coverage report that indicates which conditions it covers and which ones it doesn't.


closeup photo of eyeglasses

  1. It ensures that our test cases have checked all the conditions or not!

  2. With Condtion Coverage we can detect bugs in a early stage an can fix them first hand.

  3. Thorough testing of all possible conditions improves the reliability and maintainability of the software.

  4. Thorough testing lowers the risks of errors, improves the quality of our tests, and helps meet quality standards.

  5. Well-tested conditions make it easier to find and fix problems, making our troubleshooting process more efficient.


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  • Arindam

    As a DevRel Intern at Keploy, a tool for automating writing manual Test cases, I am responsible for creating and delivering engaging and informative web content and technical documentation for our users and partners. I use my skills in web development, content creation, and public relations to produce high-quality tutorials, blogs, videos, podcasts, and newsletters that showcase the features and benefits of our platform and help our users solve their deployment challenges. I am also a passionate tech blogger and an open-source enthusiast, with over 50 blog posts published on various platforms, reaching over 100,000 views and 10,000 claps. I write on topics such as open source, web development, and data structures and algorithms, to share my knowledge and passion with the tech community. I have also participated in several open source programs and events, such as Hacktoberfest, Google Summer of Code, and MLH Fellowship, where I have contributed to various open source projects and learned from experienced mentors and peers. I am currently pursuing my B.Tech degrees in Information Technology and Computer Science at MAKAUT and Heritage Institute of Technology, respectively. I am eager to learn new skills and technologies and apply them to real-world problems and solutions. I am also interested in exploring the fields of artificial intelligence, machine learning, and natural language processing, and how they can enhance the user experience and the social impact of web applications. My goal is to become a full-stack developer and a leader in the tech industry.

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