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Advantages of using TestNG with Cucumber
Testing is the process of checking the functionality of an application to ensure it works as per requirements. Unit testing comes into picture at the developer level where adequate measures are taken to test every single entity (class or method) to ensure the final product meets the requirements.
What is Cucumber?
Cucumber is a testing tool that supports Behaviour Driven Development (BDD) framework. It defines application behaviour using simple English text, defined by a language called Gherkin.
Cucumber allows automation functional validation that is easily read and understood. Cucumber was initially implemented in Ruby and then extended to Java framework. Both the tools support native JUnit.
To get better advantage of the software testing, organizations are nowadays taking a step forward. They implement important acceptance test scenarios while development is in−progress. This approach is commonly known as Behaviour Driven Development (BDD).
Behaviour Driven Development gives us an opportunity to create test scripts from both the developer’s and the customer’s perspective as well. So, in the beginning, developers, project managers, QAs, user acceptance testers and the product owner (stockholder), all get together and brainstorm about which test scenarios should be passed in order to call this software/application successful. This way they come up with a set of test scenarios. All these test scripts are in simple English language, so it serves the purpose of documentation also.
What is TestNG?
Definition of TestNG as per its documentation is as follows: "TestNG is a testing framework inspired from JUnit and NUnit but introducing some new functionalities that make it more powerful and easier to use."
TestNG is an open−source automated testing framework, where NG means NextGeneration. TestNG is similar to JUnit (especially JUnit 4), but it is not a JUnit extension. It is inspired by JUnit. It is designed to be better than JUnit, especially when testing integrated classes. The creator of TestNG is Cedric Beust.
Eliminating most of the limitations of the older framework, TestNG gives the developer the ability to write more flexible and powerful tests. As it heavily borrows from Java Annotations (introduced with JDK 5.0) to define tests, it can also show you how to use this new feature of the Java language in a real production environment.
TestNG uses more Java and OO features.
Supports testing integrated classes (e.g., by default, no need to create a new test class instance for every test method).
Separates compile−time test code from run-time configuration/data info.
Flexible runtime configuration.
Introduces ‘test groups’. Once you have compiled your tests, you can just ask TestNG to run all the "front−end" tests, or "fast", "slow", "database" tests, etc.
Supports Dependent test methods, parallel testing, load testing, and partial failure.
Flexible plug−in API.
Support for multi−threaded testing.
Advantages of using TestNG with Cucumber
TestNG with Cucumber as BDD tool, user can have your test suite and a simple English abstraction layer on top. The business will be able to look at the test results. Where tests have failed, they will be able to describe exactly what section has gone wrong to other members of management, without having to go too far into technical details.
Though Cucumber has good execution reports, TestNG provides many other features like setting priority, dependencies, timeout, grouping etc. These features are not available in Cucumber. So, it is a best match to use TestNG with Cucumber to have a multi−featured framework.
Cucumber has tag features still it lacks with many other features with TestNG. Along with TestNG, cucumber becomes a rich in different functionalities that helps to maintain, organize and evolve latter based on changes.
Other than above features, few more very useful features in TestNG are Listeners, Concurrency, Parallel execution, Group of Tests, In built exception handling, segregation of test cycle at different level, re-run failed test cases. These features are missing in Cucumber.
Cucumber is a good tool to utilize BDD features where other stakeholders can understand test cases and result. It is just a wrapper class but to make a good testing framework or backbone of BDD either could be TestNG or Junit. This framework comes with lot of functionalities those are useful for an efficient and effective framework.
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