Question 1

How to mock time.Time arguments with sqlmock?

Accepted Answer

Implement the Argument interface with a custom type like AnyTime that defines a Match method to validate time.Time values, as shown in the README example for flexible argument matching.

Question 2

sqlmock vs using a real test database: which is better for Go?

Accepted Answer

sqlmock is best for unit tests isolating logic without external dependencies, while a real test database is necessary for integration tests validating actual SQL execution and data persistence. Choose based on test scope and speed needs.

Question 3

Does sqlmock support prepared statements?

Accepted Answer

Yes, sqlmock allows mocking prepared statements with expectations for Prepare, Exec, and Query, and even supports verifying that statements are closed using ExpectedPrepare.WillBeClosed.

Question 4

How to handle concurrent database tests with sqlmock?

Accepted Answer

sqlmock is designed to be concurrency-safe; you can set up mock expectations that handle multiple goroutines, but ensure expectations are defined correctly to avoid race conditions in test code.

Question 5

What are common pitfalls when using sqlmock?

Accepted Answer

Common mistakes include not matching query order strictly, forgetting to call ExpectationsWereMet to verify all expectations, or mishandling argument types, especially with complex structs like time.Time.

Question 6

Is go-sqlmock still actively maintained?

Accepted Answer

The library is stable and feature-complete, but the README notes it's seeking new maintainers, suggesting limited active development. However, it remains widely used and reliable for many use cases.

go-sqlmock

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