How to test database interactions in PHPUnit?

@deron 

To test database interactions in PHPUnit, you can follow these steps:

1. Set up a test database: Create a separate database specifically for testing purposes. This will ensure that your tests don't interfere with your production data.
2. Create a test case: In your test class, extend the PHPUnitFrameworkTestCase class. This will provide the necessary functionality for running the tests.
3. Set up the database connection: Inside the test class, you need to establish a connection to the test database. This can be done by using a library like PDO or an ORM such as Doctrine.
4. Create test data: Prior to running each test, you may need to set up some initial data in the database. You can do this by executing SQL statements or using your ORM's API to create and persist objects.
5. Write test methods: Each test method should focus on a specific database interaction you want to test. For example, you might have a test for inserting a new record, another for updating an existing record, and so on.
6. Perform the database operations: Inside each test method, perform the necessary database operations using your ORM or raw SQL queries.
7. Verify the results: After performing the database operation, verify that the expected changes have occurred in the database. You can use assertions provided by PHPUnit to check if the data has been inserted, updated, or deleted correctly.
8. Clean up after each test: After running a test, you should clean up any test data that was created. This can be done by deleting records from the database or using transactions to roll back any changes made during the test.
9. Tear down the test case: Finally, close the database connection and perform any other necessary clean-up tasks in the tearDown() method of your test class.

By following these steps, you can effectively test your database interactions using PHPUnit.