What is JUnit? | Why Mockito?
What is Junit?
Junit is an open-source framework used for automating (writing and executing) unit test cases in the Java programming language. It is one of the well-known and best-known unit test frameworks.
This is used to verify the code that logically working as expected. For that, it needs to have a test case or verification. End of every test execution this gives a summarized report with passed and failed test cases. Normally the unit test line coverage should be more than 80% for each file.
In the maven project, we have a dependency called ‘junit’ to add the framework to the project.
In ‘JUnit’ there are listed attributes that can use to annotate or execute test units. In the following example, @Test and asserEquals are provided from the JUnit framework.
What Unit Testing Is and Its Importance?
In a typical software development world, all developers focus on testing units of every code they have developed. In test-driven development (TDD) approach all units should be automated before developing the code. This is failed until the code developed according to the test case (unit test).
There are two main types of unit testing: manual and automated. We automate test cases to reduce the time and increase the accuracy we use for manual testing. Normally if the test folder is placed in the project that means the test should be automated according to project code.
Importance:
· maintain quality of the code
· process becomes agile
· software bugs can find in development face
· reduce cost
· improve best practices
What is a Unit?
A unit is known as the smallest possible component (unit) of software that can be tested. Generally, it has a few inputs and a single output. In a software code, the smallest component is a method and then classes. In unit testing we automate methods. Coverage gives according to classes, methods, and lines that cover the unit tests.
Why Mockito?
In classes, there are classes that need to make them not null. As an example, see the following method,
In the above getCourse() method, courseDAO is another class that invokes inside the method. To test that method the DAO class needs to be in the not null state. To make it not null (to mock) we use ‘mokito’. It is a mocking framework and java-based library. This can be used to create dummy functionality in unit testing. As an example, using this library developer can mock the database connection without creating an actual database connection.
