Introduce RowBuilder to support writing basic unit tests #979
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Added RowDescription trait, and let rows to share the same description rather than having a copy in each row (think when there are thousand of them in the result).
Added RowBuilder to support adding stubs of row data in unit tests.
Currently, the library users have no chooice but have to use integration tests for testing Postgres data access code. With the changes in this commit, the
tokio-postgres
lib users can use RowBuilder to create sutbs to verify the deserialization from database result (Rows) to custom stucts in unit tests.It can also serves as a base for future implementation of certain kind of mocks of the db connection.
Related-to #910 #950