ETL Testing ETL Testing Tools and Automation

Question 1

Which open-source framework is commonly used in the US for automated ETL pipeline testing with SQL-based assertions?

Accepted Answer

dbt (data build tool) with dbt test

Answer

dbt's built-in test framework allows data engineers to write SQL-based assertions (not_null, unique, relationships) that run automatically after each transformation model.

Question 2

What is the primary purpose of Apache Griffin in the ETL testing ecosystem?

Accepted Answer

Providing a data quality measurement platform for batch and streaming pipelines

Answer

Apache Griffin is an open-source data quality service that measures accuracy, completeness, timeliness, and other quality dimensions across ETL pipelines at scale.

Question 3

In ETL automation testing, what is a 'data diff' tool used for?

Accepted Answer

Comparing source and target datasets row-by-row to identify discrepancies automatically

Answer

Data diff tools automatically compare datasets at the row and column level to surface mismatches between source, staging, and target without manual inspection.

Question 4

Which AWS service is commonly tested in US-based ETL pipelines to verify that Glue jobs correctly transform data?

Accepted Answer

AWS Glue job with PyTest and GlueContext mocking

Answer

AWS Glue ETL jobs are typically tested using PyTest with mocked GlueContext or local Glue development endpoints to validate transformation logic before production deployment.

Question 5

What does 'data lineage tracking' provide that is valuable for ETL testing?

Accepted Answer

A visual or programmatic map of how data flows from source to target, enabling impact analysis and root cause diagnosis

Answer

Data lineage tools show the full path data travels through an ETL pipeline, helping testers quickly identify which transformation or load step introduced a defect.

ETL Testing - extract, transform, load Practice Test

ETL Testing - extract, transform, load Practice Test

ETL Testing ETL Testing Tools and Automation