How to Achieve Database Testing in Golang with TDD?

Database Testing in Golang with TDD

Database testing is an essential aspect of TDD for data-driven applications. In Golang, testing database queries can be achieved through several approaches.

Libraries for Connecting to a Separate Test Database

If the intention is to avoid using the default database, there are two options:

• Provide an Exported Type and Open/Connect Function: Create a custom type that handles database connections and provide a function to establish a test database.
• Alternative Global DB Variable: Initialize a global *sql.DB variable in the test setup and utilize it throughout the tests.

Libraries for Testing Without Database Connection

There are no popular libraries that allow for database testing without actual database connectivity in Golang. Integration testing against a real database is often preferred for reliability and accuracy.

Standard Way of Database Testing in Golang

The recommended approach for database testing in Golang is to employ integration testing, which involves connecting to a separate test database. This allows for thorough testing of queries and schema interactions.

Test Database Setup Considerations

• Create a dedicated test database and initialization script.
• Utilize a setup/teardown pattern to create the test environment and clean up after each test.
• Consider pooling database connections for performance optimization.

Additional Resources

• [Drone.io's GitHub repo](https://github.com/drone/drone)
• [Article on structuring Go applications](https://blog.logrocket.com/how-to-structure-a-go-application-like-a-pro/)

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