Software testing is the process of analyzing program components, programs, and systems with the intention of finding errors in them, and to determine or check their technical limits and requirements.
The database is a specific system that requires special approaches for testing. This is because the behavior of database software components (views, stored procedures, or functions) may depend not only on their code, but also on the data. In many cases, functions are not immutable. This means that executing them again with the same parameters can produce different results.
That is why one should use specific techniques to test database modules. PostgreSQL provides some features that help developers and testers in doing this.
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