How do I run cucumber tests in parallel?
Cucumber can be executed in parallel using JUnit and Maven test execution plugins. In JUnit the feature files are run in parallel rather than scenarios, which means all the scenarios in a feature file will be executed by the same thread. You can use either Maven Surefire or Failsafe plugin to execute the runners.
How to execute cucumber scenarios in a single feature file?
So basically, all the scenarios in a single feature file will be executed by the same single thread. As a test runner, we can either use Maven Surefire or Failsafe plugin. Execution of cucumber scenarios and the rows in scenario outlines is absolutely possible with TestNG.
Where can I find examples of parallel cucumber code?
Cucumber code examples can be found in selenium-samples-java/cucumber-parallel GitHub repository. More details what is and how to use Cucumber JVM can be found in Introduction to Cucumber and BDD with examples post. Why parallel execution? In general, an automation project starts with a smoke test scenario as a proof of concept.
What is Cucumber-JVM-parallel-plugin?
It is also the same as maven-failsafe-plugin and it gives the ability to run the tests in parallel. Despite its name cucumber-jvm-parallel-plugin does not run any tests, it just automatically generates the Cucumber runners for you.
How do you run parallel tests with multiple browsers with a Cucumber?
Run your first parallel testInstall the required dependencies by running the following command in your command-line: ... Set your BrowserStack credentials and browser/devices where you want to run your test in the cucumber-java-browserstack/src/test/resources/conf/parallel.conf.json file as follows:More items...
How do you run parallel test cases in JUnit using cucumbers?
Steps to create a project for parallel Testing in Cucumber.Detailed Step Description.Step 1 – Create a Maven project.Step 2 – Update the Properties section in Maven pom.xml.Step 2 – Add Cucumber and JUnit dependencies to the project.Step 3 – Add Surefire plugin configuration to the build section of the POM.More items...•
How do I run Cucumber JVM parallel plugin?
A common approach for running Cucumber features in parallel is to create a suite of Cucumber runners, one for each suite of tests you wish to run in parallel. For maximum parallelism, there should be a runner per feature file.
How do you make multiple scenarios in Cucumber feature file?
Feature file with Multiple Scenario Feature file can contain multiple scenarios or scenario outlines. We can write all possible Scenarios of a particular feature in a feature file. By using the keyword "Scenario" or "Scenario Outline", One Scenario can be separated from another.
How do I run multiple features parallel in Cucumber?
0:2620:13PART 5 - Run Cucumber Feature Files in Parallel Mode using Maven Fail ...YouTubeStart of suggested clipEnd of suggested clipSo today we will see that with the help of one maven plugin. How can we execute how can we executeMoreSo today we will see that with the help of one maven plugin. How can we execute how can we execute the test cases in the parallel. Mode one thing you need to remember guys that we are using junit if
What is the difference between BDD and TestNG?
Cucumber is a tool that supports Behaviour-Driven Development (BDD) - a software development process that aims to enhance software quality and reduce maintenance costs. On the other hand, TestNG is detailed as "A testing framework inspired from JUnit and NUnit".
What is parallel execution?
Parallel execution is the ability to apply multiple CPU and I/O resources to the execution of a single database operation. It dramatically reduces response time for data-intensive operations on large databases typically associated with decision support systems (DSS) and data warehouses.
How do you run the same scenario with different test data in Cucumber?
There are different ways to use the data insertion within the Cucumber and outside the Cucumber with external files. Scenario Outline - This is used to run the same scenario for 2 or more different sets of test data. E.g. In our scenario, if you want to register another user you can data drive the same scenario twice.
How do you run multiple scenarios in Cucumber with tags?
We can define each scenario with a useful tag. Later, in the runner file, we can decide which specific tag (and so as the scenario(s)) we want Cucumber to execute. Tag starts with “@”. After “@” you can have any relevant text to define your tag like @SmokeTests just above the scenarios you like to mark.
Can we have multiple Then in gherkin?
The Cardinal Rule is a way to break out of the procedure-driven mindset, and banning multiple When-Then pairs per Gherkin scenario is an effective rule for enforcing it.
What is the difference between scenario and scenario outline?
Scenario outline is exactly similar to the scenario structure, but the only difference is the provision of multiple inputs. In order to use scenario outlines, we do not need any smart idea, we just need to copy the same steps and re-execute the code.
How many scenarios can a feature file have?
Answer: A feature file can contain a maximum of 10 scenarios, but the number can vary from project to project and from one organization to another. But it is generally advisable to limit the number of scenarios included in the feature file. Q #13) What is the use of Background keyword in Cucumber?
How do you run the same scenario with different test data in Cucumber?
There are different ways to use the data insertion within the Cucumber and outside the Cucumber with external files. Scenario Outline - This is used to run the same scenario for 2 or more different sets of test data. E.g. In our scenario, if you want to register another user you can data drive the same scenario twice.
How do you run test cases in Cucumber?
Run Cucumber tests with JUnitIn the Project tool window, right-click the package with step definitions and select New | Java Class.Name the new class (for example, RunCucumberTest ) and press Enter .Add the following code to the class: import io. cucumber. ... Click. in the gutter and select Run 'test name'.
How do you run a Cucumber test in parallel using gradle?
gradle you determine the --threads cucumber option.Take a look in the build.gradle here.if runInParallel task is used it puts setParallel to true. ... Here is where the built cucumber options are used.CreateSharedDrivers. ... In Hooks.java here there is an example of how we log the thread and its current scenario.
What is Cucumber JUnit?
JUnit is an open source unit testing framework for the Java programming language. JUnit has been important in the development of test-driven development, and is one of a family of unit testing frameworks, which is collectively known as xUnit that originated with SUnit.
How many threads can you execute on Hub?
Considering you want to execute more than 50 threads i.e. same no of browser instances are registered to HUB but Hub will die if it doesn't get enough memory therefore to avoid this critical situation you should start hub with -DPOOL_MAX=512 (or larger) as stated in grid2 documentation.
Can cucumber 5 use QAF?
EDIT: Cucumber-5 users can take benefit of qaf-cucumber support library.
Can cucumber test run in parallel?
Above two plugins will do magic for cucumber test running in parallel (provided you machine also have advanced hardware support).
Does cucumber support parallel execution?
Cucumber does not support parallel execution out of the box. I've tried, but it is not friendly.
How to add cucumber runner?
Add a cucumber runner by extending the AbstractTestNGCucumberTests class and overriding the scenarios method in the parallel package (same name as step definition package) in src/test/java folder. Set the parallel option value to true for the DataProvider annotation.
What is the main class in io.cucumber?
The Main class in the io.cucumber.core.cli package is used to execute the feature files. You can run this class directly from the command line; in that case, there is no need to create any runner class. The usage options for this class are mentioned here. The --threads option needs to be set to a value greater than 1 to run in parallel. When the parallel mode is used, the scenarios and rows in a scenario outline will be run in multiple threads.
What is the default thread count in parallel mode?
The default thread count of the dataprovider in parallel mode is 10. To change this the dataproviderthreadcount property needs to be added to the configuration section of the Surefire or Failsafe plugin in the POM.
Does cucumber JVM work on parallel?
Cucumber-JVM allows parallel execution across multiple threads since version 4.0.0 . There are several options to incorporate this built-in feature in a Cucumber project. You can do so using:
Can you parallel run multiple runners?
In case of multiple runners one can also set the parallel option to classesAndMethods or classes in addition to methods.
Can cucumber be executed in parallel?
Cucumber can be executed in parallel using TestNG and Maven test execution plugins by setting the dataprovider parallel option to true. In TestNG the scenarios and rows in a scenario outline are executed in multiple threads. One can use either Maven Surefire or Failsafe plugin for executing the runners.
Why parallel execution?
In general, an automation project starts with a smoke test scenario as a proof of concept. It seems good enough and team start to add tests for different features and modules. Eventually, a team can end up with hundreds of tests taking hours to execute. This becomes a problem as tests can be run only overnight. It is not easy to run tests for an emergency quick fix for example. This is why running tests in parallel is important and it is better to always start an automation project with this in mind.
Why do you need to change cucumber parallel?
This a must because all Cucumber threads try to create cucumber-parallel directory and since Cucumber is not thread safe most of them fail.
How many browsers can open in pom.xml?
In the current example there are only 3 not ignored feature files, this is why you see 3 browsers opening. Settings in pom.xml guarantees you up to 10 parallel executions, so you need to add more feature files.
Does cucumber JVM run tests?
Despite its name cucumber-jvm-parallel-plugin does not run any tests, it just automatically generates the Cucumber runners for you. This saves you time from making empty runner files and also just by changing the config of the cucumber-jvm-parallel-plugin you can have brand new set of runner files. see more.
Is cucumber report thread safe?
Cucumber reporters are not thread-safe. This means if several parallel runners want to write in one and the same Cucumber report file for sure file will get scrambled. It is mandatory to avoid such cases. This is another requirement to have each runner reporting to separate file.
Can Surefire run JUnit tests in parallel?
Knowing that Surefire can run JUnit tests in parallel and feature files are run by an empty JUnit class then best strategy to enable efficiently parallelism is to have many small feature files and to have runner class for each and every feature file. With this approach, there is granularity which can allow many tests to run independently in ...
Can you run tests in parallel?
This becomes a problem as tests can be run only overnight. It is not easy to run tests for an emergency quick fix for example. This is why running tests in parallel is important and it is better to always start an automation project with this in mind.
Does cucumber 6 support parallel execution?
But there is great news on this front: Cucumber 6 supports parallel execution of features in JUnit natively.
Can cucumber run parallel?
The downside is that Cucumber with JUnit only supports executing features in parallel, not scenarios.
What plugin does parallel cucumber use?
parallel-cucumber-jvm uses cucumber-jvm 1.2.5 (I've used the groovy plugin along side this) - I did look into upgrading this to support the newer libraries, but it was messy at best and didn't account for the comments around performance e.g. not performing expensive operations multiple times
Why do cucumbers put all scenarios in one queue?
Cucumber will group all scenarios with the same @synchronized- tag name in one "execution group" and will place them first in the queue, because they contain several not-parallelizable scenarios, so executing them first is more efficient if one group is quite large (imagine this large group being at the bottom of the queue: we would end up with the poor parallelization efficiency discussed in "Current Behavior" with other threads having finished their job and being idle)
What happens at the beginning of a feature file execution?
At the begin of the execution, all .feature files are scanned and all scenarios are put in a queue
Does cucumber use Junit?
Being a test runner Cucumber would use the JUnit Platform by implementing the JUnit Engine rather then integrate with JUnit Jupiter.
Is parallelization critical in testing?
Testing at such scale that parallelization becomes critical is also the kind of situation where people tend to be rolling their own CI pipelines anyway, so the odds of there being more than one Cucumber process anyway on lots of machines (as opposed to one process with loads of threads on one machine) goes up. Smaller, composable tools become a lot more valuable than one tool tool that tries to do everything.
Does cucumber have parallelization?
Cucumber does not offer a parallelization option out of the box.
Is parallel supported with CLI?
Parallel is only supported with the CLI runner.
When are cucumber scenarios atomic?
When the Cucumber Scenarios are atomic (having no dependency on each other), there is NO point in running the feature files in parallel for faster execution. The scenarios in all feature file should also be executed to get the maximum execution time reduction.
Can you execute cucumber scenarios?
Execution of cucumber scenarios and the rows in scenario outlines is absolutely possible with TestNG. This can be achieved by setting up the dataprovider parallel option as true and extending the runner class with AbstractTestNGCucumberTests from io.cucumber.testng
Can JUnit run multiple scenarios in parallel?
In JUnit, only the feature files run in parallel rather than the scenarios themself. So basically, all the scenarios in a single feature file will be executed by the same single thread. As a test runner, we can either use Maven Surefire or Failsafe plugin.
Does cucumber support parallelism?
Cucumber supports parallelism with both JUnit and TestNG. There is a difference between them and its a major one. Below we will see the best use cases on when to use JUnit and when to use TestNG.
