Data testing is a critical component of ensuring data quality, particularly as companies increasingly rely on data-driven decision-making. It focuses on identifying and fixing data issues before they reach production, contrasting with data observability, which deals with data conditions post-production. Effective data testing is integral to maintaining data accuracy, completeness, consistency, and integrity, providing a safeguard against incorrect data entering production environments. The current state of data testing includes various methods such as the Table Scan, which involves visually inspecting data for anomalies; Quality Assurance, where stakeholders verify data accuracy, often focusing only on production data and metrics of interest; and mathematical approaches, which aggregate data to identify unexpected discrepancies. Although these methods are widely used, they each have limitations and can sometimes produce misleading results, emphasizing the need for robust, proactive testing strategies to ensure high data quality and reliability.