feat: backend service

integration/testenv/network.go

@@ -0,0 +1,27 @@
+package testenv
+
+import (
+	"context"
+	"testing"
+
+	"github.com/testcontainers/testcontainers-go"
+	tcnetwork "github.com/testcontainers/testcontainers-go/network"
+)
+
+// StartNetwork creates a user-defined Docker bridge network and
+// registers a t.Cleanup to remove it. All platform containers attach
+// to the same network so they can resolve each other by alias.
+func StartNetwork(t *testing.T) *testcontainers.DockerNetwork {
+	t.Helper()
+	ctx := context.Background()
+	net, err := tcnetwork.New(ctx)
+	if err != nil {
+		t.Skipf("docker network unavailable: %v", err)
+	}
+	t.Cleanup(func() {
+		if err := net.Remove(ctx); err != nil {
+			t.Logf("remove network: %v", err)
+		}
+	})
+	return net
+}