If you ever wrote database unit tests in Java you most probably faced the problem associated with pre-filling any entity DB table. It is not convenient to write code for populating database tables. The perfect solution is the DBunit framework.
DBUnit is an open-source framework for importing data into database, table, comparing tables and datasets with DB. It is also known as a JUnit extension that puts a database into a particular state.
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Step 0. Familiarization with DBUnit
Where and why is this technique used?
Before release of any software product, it goes through a series of different testing types. Because most applications use databases, it makes sense to test database code.
The primary step is database population, results in comparison, database cleanup after execution of tests. All these operations are performed with Junit. But if you have a many-to-many relationship in database design, then numerous modifications are to be tested, since database gets bigger and bigger.
Step 1. Adding dependencies
When using MBUnit test framework, it is necessary to download the library from Maven dependency.
After that, DBUnit utilities get invoked. Now, the rest of the libraries are to be added to the project. We will need the following database libraries: Hibernate, JPA, Mysql, and JUnit.
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Step 2. Creating entities for testing
Let us create an entity that will be tested with DBUnit. It can be Person. To understand this step, you will need to acquire knowledge of JPA.
Step 3. Creating a service for entity management
This service will help to delete, add, modify and receive our class of entity framework from the database.
Step 4. Familiarization with test content and structure
PersonTest — tests for us (for Person)
DBUnitConfig — our configuration class that will enable faster creation of DBUnit tests. It has settings for test behaviors and database configuration.
db.config.data — has inside database settings.
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