DefaultConnTestRunner returns a new ConnTestRunner with all fields set to reasonable default values.

RunWithQueryExecModes runs a f in a new test for each element of modes with a new connection created using connector.

SkipCockroachDB calls Skip on t with msg if the connection is to a CockroachDB server.

KnownOIDQueryExecModes is a slice of all query exec modes where the param and result OIDs are known before sending the query.

ConnTestRunner controls how a *pgx.Conn is created and closed by tests.