feat: game lobby service

lobby/internal/adapters/racenamestub/directory_test.go

@@ -0,0 +1,78 @@
+package racenamestub_test
+
+import (
+	"context"
+	"errors"
+	"strconv"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"galaxy/lobby/internal/adapters/racenamestub"
+	"galaxy/lobby/internal/ports"
+	"galaxy/lobby/internal/ports/racenamedirtest"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDirectoryContract(t *testing.T) {
+	racenamedirtest.Run(t, func(now func() time.Time) ports.RaceNameDirectory {
+		var opts []racenamestub.Option
+		if now != nil {
+			opts = append(opts, racenamestub.WithClock(now))
+		}
+		directory, err := racenamestub.NewDirectory(opts...)
+		require.NoError(t, err)
+		return directory
+	})
+}
+
+func TestReserveConcurrentUniquenessInvariant(t *testing.T) {
+	t.Parallel()
+
+	const goroutines = 64
+	const raceName = "SolarPilot"
+	const gameID = "game-concurrency"
+
+	ctx := context.Background()
+	directory, err := racenamestub.NewDirectory()
+	require.NoError(t, err)
+
+	var (
+		successCount atomic.Int32
+		takenCount   atomic.Int32
+		waitGroup    sync.WaitGroup
+		start        = make(chan struct{})
+	)
+
+	waitGroup.Add(goroutines)
+	for index := range goroutines {
+		userID := "user-" + strconv.Itoa(index)
+		go func(userID string) {
+			defer waitGroup.Done()
+			<-start
+			err := directory.Reserve(ctx, gameID, userID, raceName)
+			switch {
+			case err == nil:
+				successCount.Add(1)
+			case errors.Is(err, ports.ErrNameTaken):
+				takenCount.Add(1)
+			default:
+				t.Errorf("unexpected error: %v", err)
+			}
+		}(userID)
+	}
+
+	close(start)
+	waitGroup.Wait()
+
+	assert.Equal(t, int32(1), successCount.Load())
+	assert.Equal(t, int32(goroutines-1), takenCount.Load())
+
+	availability, err := directory.Check(ctx, raceName, "user-missing")
+	require.NoError(t, err)
+	assert.True(t, availability.Taken)
+	assert.Equal(t, ports.KindReservation, availability.Kind)
+}