Test Discovery and the Service End-to-End

Distributed Services with Go — by Travis Jeffery (54 / 84)

👈 Request Discovered Services and Re plicate Logs | TOC | What You Learned 👉

Let’s test that our service discovery and replication works in an end-to-end test. We’ll set up a cluster with three nodes. We’ll produce a record to one server and verify that we can consume the message from the other servers that have (hopefully) replicated for us.

In internal/agent, create an agent_test.go file, beginning with this snippet:

ServerSideServiceDiscovery/internal/agent/agent_test.go

​ ​package​ agent_test
​ 
​ ​import​ (
​         ​"context"​
​         ​"crypto/tls"​
​         ​"fmt"​
​         ​"io/ioutil"​
​         ​"os"​
​         ​"testing"​
​         ​"time"​
​ 
​         ​"github.com/stretchr/testify/require"​
​         ​"github.com/travisjeffery/go-dynaport"​
​         ​"google.golang.org/grpc"​
​         ​"google.golang.org/grpc/credentials"​
​ 
​         api ​"github.com/travisjeffery/proglog/api/v1"​
​         ​"github.com/travisjeffery/proglog/internal/agent"​
​         ​"github.com/travisjeffery/proglog/internal/config"​
​ )

What can I say? Our end-to-end test has a lot going on and requires a lot of imports to make it happen.

Now we can write the test beginning with this code:

ServerSideServiceDiscovery/internal/agent/agent_test.go