Data Pipelines with Apache Airflow

9 Testing

This chapter covers

• Testing Airflow tasks in a CI/CD pipeline
• Structuring a project for testing with pytest
• Mimicking a DAG run to test tasks that apply templating
• Faking external system events with mocking
• Testing behavior in external systems with containers

In all previous chapters, we focused on various parts of developing Airflow. So how do you ensure the code you’ve written is valid before deploying it into a production system? Testing is an integral part of software development, and nobody wants to write code, take it through a deployment process, and keep their fingers crossed for all to be okay. Such a way of development is obviously inefficient and provides no guarantees on the correct functioning of the software, both ...