CreateTestClientConn creates a new client connection using bufconn.

InitializeTestResources initializes the desired number of RpcClients for testing.

InitTestServer initializes the in-memory gRPC server and the test database.

NewDefaultTestServerConfig creates a TestServerConfig with default values.

SetupTestDatabase initializes the test database.

TeardownTestDatabase cleans up the test database.

TestFieldHook is a custom Logrus hook that adds a field to every log entry.