Reduce TestInitDatabaseService flakiness (#49477)

* test(service): assert process exit status

* test(service): add cleanup to ensure server is closed

* chore(service): typo

lib/service/service_test.go

@@ -41,6 +41,7 @@ import (
 	"github.com/jonboulle/clockwork"
 	"github.com/sirupsen/logrus"
 	"github.com/stretchr/testify/require"
+	"golang.org/x/sync/errgroup"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/credentials/insecure"
@@ -1818,19 +1819,28 @@ func TestInitDatabaseService(t *testing.T) {
 			cfg.Databases.Enabled = test.enabled
 			cfg.Databases.Databases = test.databases
 
+			// This timeout should consider time to receive the event + shutdown
+			// time.
+			ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+			defer cancel()
+
+			var eg errgroup.Group
 			process, err := NewTeleport(cfg)
 			require.NoError(t, err)
+			require.NoError(t, process.Start())
+			eg.Go(func() error { return process.WaitForSignals(ctx, nil) })
+			// Ensures the process is closed in failure scenarios.
 			t.Cleanup(func() {
-				require.NoError(t, process.Close())
+				cancel()
+				_ = eg.Wait()
 			})
-			require.NoError(t, process.Start())
-
-			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-			defer cancel()
 
 			if !test.expectErr {
 				_, err := process.WaitForEvent(ctx, TeleportReadyEvent)
 				require.NoError(t, err)
+				require.NoError(t, process.Close())
+				// Expect Teleport to shutdown without reporting any issue.
+				require.NoError(t, eg.Wait())
 				return
 			}
 
@@ -1840,6 +1850,9 @@ func TestInitDatabaseService(t *testing.T) {
 			exitPayload, ok := event.Payload.(ExitEventPayload)
 			require.True(t, ok, "expected ExitEventPayload but got %T", event.Payload)
 			require.Equal(t, "db.init", exitPayload.Service.Name())
+			// Database service init is a critical service, meaning failures on
+			// it should cause the process to exit with error.
+			require.Error(t, eg.Wait())
 		})
 	}
 }