Interaction With Race Detector

[fedyakin]

This library is very handy, but when used in tests of concurrent code will trigger the go race detector.

A very simple case is if you have two tests that both call something like testdb.SetQueryFunc. The first test to run uses the query function in a goroutine, the call to set the query function in the second test can be detected as a race.

The race detector is logically correct; a value was read from and written to by different goroutines with no synchronization. However, this should be safe usage of the testdb library, as the two tests are never run concurrently.