From the ideation of new software to the first stable version of any software, there's rarely a straight road. Even developing new features for an existing platform or implementing fixes to improve the software, we are destined to repeat the cycle of building, testing, and debugging countless times to achieve the best possible quality.
In the midst of this rigorous SDLC (Software Development Life Cycle), more often than not, time to market determines the failure and success of software. Getting even a critical bug at the end of the testing makes it challenging to achieve desired time to market. Here comes the smoke testing; it is a must-have software testing technique to save that precious time by detecting critical bugs early in any modern agile SDLC.
This detailed guide will cover the idea and applications of smoke testing.
Smoke testing is a practice that helps you determine whether the most crucial functions of the software are working as intended or not. Smoke testing enables you to identify mission-critical failures as early as possible, so you can fix them before getting into finer details.
E.g., Imagine you are testing a newly manufactured car that needs thorough testing before going to a dealer. Then checking if the car is turning on and off, the engine is working fine, moving as per usual driving standards, etc., are part of the smoke testing process. After these crucial basic features are tested, the QA team would test finer details like paint, power windows, AC temperatures, or any luxury or value addition features.
Coming back to software testing, smoke testing is essential immediately after developing a build of the application and also before the release. Smoke tests help find critical software bugs before they impact users, so they're a critical component of any development process.
Don't know what a build is? A software build is a procedure by which source code is converted into a stand-alone form that can be run on any system. However, there are always risks that the build might not work in your environment. For example, configuration, code, regression, or environmental issues could exist. So the first build is subjected to smoke testing before sending it to other testing levels. Smoke testing targets key functionalities, and if key features aren't working or major bugs haven't been fixed, there's no need to invest time in further testing.
Smoke testing, also called build verification or acceptance testing, is a preliminary software analysis that checks the functionality of important parts of a program but does not determine whether the program is error-free.
The term "smoke test" originates from a simple hardware testing procedure in which a piece of hardware passes if it doesn't catch fire when it first turns on.
In simple terms, we're ensuring that the most important features are working and there aren't any major problems in the code being tested.
It's a quick test of major functionality. This helps determine if the build is ready for further testing. It prevents wasting time and resources on faulty builds.
Smoke tests are build verification tests generally used at the start of any testing cycle for new builds. Smoke tests check to ensure that the primary requirements will be met; if not, they stop the build from being deployed. They should be carried out as soon as any new build is deployed or if there is any change.
Code needs to be stable before regression testing can begin, so smoke tests are created in each sprint to ensure code stability. This saves time and ensures that the corners of the code are covered.
Smoke testing aims to test a system's most important functionalities, not to execute all possible test scenarios.
Imagine you’re creating a new mobile app. That means joining an ever-growing market with the potential for lots of revenue:
When you experience a great deal of revenue growth quickly, you may find yourself in a highly competitive market. You’ll need to thoroughly test your new app and ensure that it has as few bugs as possible before releasing it for the first time.
To ensure that your app’s builds are error-free and completely stable, you will want to perform smoke testing on those builds. Smoke testing can occur in the early stages of development and then continue as you improve or edit the app’s code.
The primary purpose of smoke testing is not to find bugs but to determine at what point the software has reached a degree of stability. The goal of any smoke test is to create a group of tests that are broad in scope instead of just trying to locate bugs.
While many organizations take smoke testing to be a mere acceptance criteria, it is the first step of quality assessment. To successfully implement smoke testing, an organization needs to understand its characteristics.
So far, we've seen that smoke tests are necessary for all software builds to guarantee stability. If it's just another item on your long checklist, why not skip it? What makes it so valuable?
The answer is simple: the long list of benefits that come with smoke testing. Below are a few of the many advantages associated with performing tests early in the development process:
It's valuable to be able to verify the stability of your builds early on. This allows you to use them later, reducing developers' work manually searching for and reporting bugs late into the development cycle.
By making sure things are functional moving forward, you’ll give the testers the peace of mind to know that they don’t need to worry about bugs in the code causing glitches.
The positive results of smoke testing are often enough to guarantee system stability, a solid foundation you can build later. It’s easier to add to something good than trying to overhaul a broken system later down the line.
Stable software builds across the board can help you increase revenue and improve overall performance. That means your company can join the other companies expecting to grow their revenue soon:
Smoke tests ensure that every application component works and is very easy to conduct. In the later section, we'll go through all the steps involved in running a smoke test—it's pretty simple!
That means you can smoke tests often without overtaxing the resources of your servers and other equipment.
Smoke tests are simple enough to be combined with just about any type of testing. You can add a smoke test after nonfunctional testing, run it more than once in the development process, or put it in at the end of your hardware testing.
The fewer bugs that make it to end-users, the better. That’s why catching bugs early is important; it gives developers additional time to fix and ensure that the most prominent ones never make it to users.
By frequently smoke testing your software, you can keep it relatively free of bugs. You can promise your users that any potentially harmful errors have been caught before they impact their experience.
Smoke testing leads to fewer bugs. This means a better product for your customers.
When you provide a high-quality product, your customers will be more satisfied, leading to a better reputation for your organization.
Quality assurance helps ensure your software works as customers expect. Then, they will have a better time using it when it does. Also, they'll have those priceless customer experiences you can't afford to overlook:
Smoke testing is a simple way to catch big bugs early in the testing process. All you need to do is run your application frequently and use it well.
QA teams have many responsibilities and cannot afford to waste time executing large test suites to catch issues smoke tests could catch.
To maximize the efficiency of your QA testing, running more smoke tests with greater frequency is good. That's because smoke tests help you catch bugs before your QA teams find them.
Smoke testing is a simple and efficient way to ensure your QA teams have enough time and resources to search for bugs with a fine-toothed comb. This allows you to roll out smooth and error-free software, saving time, money, and other resources.
A proper build should be free of errors and fully functional. That’s why you will want to rely on smoke tests, which flag all errors affecting stability. This way, your developers can remove them early, and each subsequent build that adds to the original is founded on a solid and bug-free piece of software.
When you smoke test your foundational code, you increase the reliability of your builds. You also integrate new builds more easily because they will be relatively clean of significant issues.
Moreover, smoke testing can improve the efficiency of other test stages. Because those stages won’t be affected by the problems caught by smoke tests, they can be fixed before they affect other stages.
When we say “integrations” here, we’re not talking about the things that let you stack your tech into one unified app.
Smoke testing helps to identify problems caused by integrating new pieces of code with existing ones. Those problems are typically found by means of fresh builds, each of which would need to be tested first.
When smoke testing is performed on an integrated software system, you can be sure that each component has been validated already. That makes the integration process much smoother and more stable.
Also, you can reduce the chances that your original build will reject the new content by providing proof that the new content is stable and free of software-breaking bugs.
Thanks to smoke testing, you can create apps that easily incorporate new content in your app. This means you can continuously improve the experience you provide for your customers.
Smoke tests can help you detect problems quickly, so your teams won’t have to spend as much time searching through the code. That saves time and resources—especially if you don’t use much automation.
As you can see, smoke testing is fully automated if you choose that option. The next point in this list will elaborate on that point.
Automation testing saves time and resources. Artificial intelligence programs can complete processes faster than their human counterparts. You cannot use AI to automate processes requiring human ingenuity and ideas, but you can save time by having an AI program handle the smoke testing process.
Automation has many advantages.
You do not need to use automation to make the most of smoke testing. It’s also because the smoke testing process is highly flexible. With different types of smoke tests (discussed in later parts), you’re sure to find one that works for you
Automation is a powerful tool, but it isn’t for everyone. Yet if you don’t want to use it for any reason, you can still smoke test by doing it manually. This method has advantages, as we saw in the section discussing it more extensively.
Smoke testing isn’t just for automated and manual builds; it works on all builds, with minimal adjustments to the actual process.
Smoke testing is a flexible process useful to any business using the software. The agility of this process makes it usable by all kinds of businesses.
Getting genuine feedback from customers is vital to any business. The fact that over half of the respondents to a 2019 survey consider collecting it from customers the most effective tactic for improving the customer experience indicates that businesses understand this importance.
Smoke tests ensure that every application component works and is very easy to conduct. In the later section, we'll go through all the steps involved in running a smoke test—it's pretty simple!
Before releasing their products to customers, software developers must ensure that their creations are high quality. They can't rely on customer feedback alone to push them to keep improving.
That's where testing and feedback come in.
Smoke tests provide developers with instant feedback on their work. In other words, they’ll see what they did well and which areas need improvement.
When you use an automated method of smoke testing, you get more feedback and get it faster. This means developers get more opportunities to smooth out errors and see how their progress is always looking.
When developers use a hybrid or manual approach, they get real-time feedback on their software from human testers. This means they can catch the bugs customers will likely encounter in the field.
By providing constant feedback, smoke tests allow developers to identify the biggest bugs in their code quickly. Smoke tests can highlight the big issues, while subsequent tests highlight the more minor and elusive problems later.
API testing is an important part of the development cycle and can benefit from incorporating smoke testing.
API testing ensures that an application programming interface (API) can perform its expected functionalities. It also verifies whether the software build can consistently handle the security protections your app or software needs and assesses its overall reliability.
When smoke testing is done before the API testing process, it helps ensure that your software builds are valid.
Smoke testing catches bugs first, and your API testers won't have to waste time looking for things that aren't there. That's how smoke testing helps you ensure your API testing is effective.
Despite its many benefits, smoke testing has a few disadvantages that you should be aware of. There is no one-size-fits-all solution. Here are some of the disadvantages mentioned below:
Smoke testing and sanity testing are two different approaches to software testing. Although they both have the same goals—to ensure that your software is high quality, minimizes integration risk, and saves time—the approaches differ in subtle ways. The table below lists the main differences between smoke testing and sanity testing.
|SMOKE TESTING||SANITY TESTING|
|Smoke testing is performed to ensure that your program's crucial functions are working smoothly.||Sanity testing is performed randomly to ensure that each function works as expected.|
|To ensure the newly created build is stable enough to withstand further testing.||To evaluate the originality and rationality of software builds.|
|Smoke testing puts the whole system through its paces.||Sanity testing only exercises one small part of the entire system.|
|The main objective of the testing is to ensure that the system is stable.||The main objective of testing is to verify that the system behaves rationally.|
|Smoke testing is usually documented and scripted so that it can be performed repeatedly without variation.||Sanity testing is unscripted and relies on the participants' perceptions.|
|Developers or testers perform this testing.||Sanity testing is usually performed by software testers.|
|It is a well-researched and carefully planned test.||This is not a planned test but one done when there isn't enough time to do your actual test.|
|We can take a shallow and wide approach to include all the major functionalities without going too deep.||A narrow & deep approach in which you focus on testing all features and functionalities related to a particular software part.|
|Smoke testing is a part of acceptance testing.||Sanity testing is a part of regression testing.|
To smoke test software, take the same steps as any other testing type. Here are some things to keep in mind:
To conduct a smoke test, you can use manual, hybrid, or automated methods. Regardless of the specific type of smoke test you’re conducting, there are two types of Smoke testing: formal and informal
In this, the development team sends the application to the test lead. Then the test lead will instruct the testing team to do smoke testing and send the reports after performing the smoke testing. Once the testing team completes the smoke testing, they will send the smoke testing report to the test lead
The Test lead says that the application is ready for further testing. The test leads do not specify to do smoke testing, but still, the testing team starts testing the application by doing smoke testing
Smoke testing usually is performed manually, but it may also be accomplished through automation. It differs from organization to organization
To test a product, the tester has to write and update the test cases. They can either write test scripts for existing features or new features. The manual method is the most commonly used smoke-testing method under which the smoke test cases are tested manually for the fresh build and the newly added features. Here, the scripts must be modified to reflect each requirement.
Smoke testing ensures that critical path navigation won't hinder functionality. Once the build is released to QA, high-priority functional test cases are taken up and tested to determine any critical defects in the system. If the test passes, we continue functional testing. If the test fails, we reject the build and send it back to the development team for correction.
Once again, QA receives a new build. They begin testing it by performing "smoke testing." Smoke testing is performed on new builds and then integrated with older builds to ensure the system's correctness. Before performing smoke testing, QA should ensure that each build has been built with the correct version.
Automation testing tools handle the testing process automatically. Automated smoke tests are performed when we need to run a batch of automated tests and immediately test the build whenever an issue is reported
Smoke testing can drastically reduce the time it takes to test. If you automate these tests, smoke testing can take only a few minutes. If developers make builds frequently or implement continuous testing, then automating smoke tests will enable QA testers to give faster feedback on test builds
Tools for automated smoke testing include LambdaTest and PhantomJS. LambdaTest is a cloud-based cross browser testing platform that allows you to perform automation testing at scale over an online browser farm of 3000+ browsers and operating systems
It is a combination of both manual and automated testing. In this case, the tester writes the test cases and can also automate the tests using tools. It increases performance because it combines both manual and automation tools
As its name suggests, hybrid smoke testing combines functional and performance testing methodologies. Its purpose is to improve the overall effectiveness of smoke testing
Now that you know the benefits of smoke testing and why it’s a good idea to spend time conducting smoke tests, let’s learn how.
There are three ways to perform a smoke test: manual, automated, and both. Regardless of the type of smoke test you’re conducting, follow the steps in this tutorial to conduct it successfully every time.
Here's how to perform Real time testing of your website or web application on the LambdaTest platform:
To perform automated smoke testing on the LambdaTest platform, follow the below steps:
On LambdaTest, you have two options for mobile app testing:
LambdaTest offers both options, and it is up to you which way to go.
To smoke test with emulators or simulators on the LambdaTest platform, please follow these steps:
To smoke test with Real Devices on the LambdaTest platform, follow these steps:
Now you can interact with the app.
There’s no need to reinvent the wheel regarding tips for effective smoke testing. Here are some tried-and-true best practices to help make your smoke testing more productive and efficient.
As technology advances, the market and consumers demand more complex, web-based and mobile-based products. To deliver these products, it is necessary to rely on testing.
As we have mentioned earlier, Smoke testing is the first form of software testing, conducted after each developed build to detect if it has been left with some broken links or if it should be deployed further to test more.
With several advantages, smoke testing should be considered because it saves time and costs.
Smoke testing also helps developers achieve faster releases by ensuring that builds work correctly early in the development cycle. Following the steps in this guide, you’ll be able to conduct a smoke test effectively (and reap all the benefits) in no time.
The term smoke test originates from a simple hardware testing procedure in which a piece of hardware passes if it doesn't catch fire when it first turns on.
Smoke testing is an important stage in software development; it ensures that the system works correctly at the start of the project. It's much easier to fix problems at this stage than later, saving time and effort. Once you have completed smoke testing, you can begin functional testing.
Smoke testing is usually performed manually, but it may also be performed through automation. It differs from company to company. You can also run it in a hybrid mode.