How can automated tests be created in AL to validate Business Central customizations before production deployment?
Question
Learn how automated testing in AL can help Business Central developers validate customizations and reduce production deployment risks.
Explore test codeunits, test methods, test libraries, validation scenarios, and how automated tests can verify business logic and application behavior.
Understand how testing fits into Business Central development, ALM, CI/CD, and quality assurance practices.
An important topic for students and working professionals preparing for Business Central developer and technical consultant roles.
Answers
Professional Business Central development should include automated testing rather than relying entirely on manual validation. AL supports test codeunits and test methods, allowing developers to validate business logic, customizations and expected application behavior before deployment.
A strong test suite should cover scenarios such as posting, validation rules, permissions, calculations, workflows and error conditions. Tests should include both successful scenarios and expected failures—for example, verifying that an invalid document cannot be posted.
For larger implementations, automated tests should become part of the CI/CD pipeline, so a customization isn't promoted simply because it compiles; it must also pass defined quality checks.
Practical project: Build a purchase-order customization, create AL test codeunits for the business rules, execute them automatically in the development pipeline, and prevent deployment when critical tests fail.