diff --git a/internal/service/sync_bindings_spec_test.go b/internal/service/sync_bindings_spec_test.go
new file mode 100644
index 0000000..bb6c181
--- /dev/null
+++ b/internal/service/sync_bindings_spec_test.go
@@ -0,0 +1,127 @@
+package service
+
+import (
+	"encoding/json"
+	"strconv"
+	"testing"
+
+	"github.com/alicebob/miniredis/v2"
+	"github.com/ez-api/ez-api/internal/model"
+	"github.com/redis/go-redis/v9"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+type bindingSnapshot struct {
+	Namespace   string            `json:"namespace"`
+	PublicModel string            `json:"public_model"`
+	RouteGroup  string            `json:"route_group"`
+	Upstreams   map[string]string `json:"upstreams"`
+}
+
+func TestSyncBindings_SelectorExact(t *testing.T) {
+	t.Parallel()
+
+	db, err := gorm.Open(sqlite.Open("file:"+t.Name()+"?mode=memory&cache=shared"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&model.Provider{}, &model.Binding{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+
+	p := model.Provider{Name: "p1", Type: "openai", Group: "rg", Models: "m"}
+	if err := db.Create(&p).Error; err != nil {
+		t.Fatalf("create provider: %v", err)
+	}
+	b := model.Binding{Namespace: "ns", PublicModel: "m", RouteGroup: "rg", SelectorType: "exact", Status: "active"}
+	if err := db.Create(&b).Error; err != nil {
+		t.Fatalf("create binding: %v", err)
+	}
+
+	mr := miniredis.RunT(t)
+	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
+	svc := NewSyncService(rdb)
+	if err := svc.SyncBindings(db); err != nil {
+		t.Fatalf("SyncBindings: %v", err)
+	}
+
+	raw := mr.HGet("config:bindings", "ns.m")
+	if raw == "" {
+		t.Fatalf("expected config:bindings entry")
+	}
+	var snap bindingSnapshot
+	if err := json.Unmarshal([]byte(raw), &snap); err != nil {
+		t.Fatalf("unmarshal: %v", err)
+	}
+	if snap.Upstreams == nil || snap.Upstreams[jsonID(p.ID)] != "m" {
+		t.Fatalf("unexpected upstreams: %+v", snap.Upstreams)
+	}
+}
+
+func TestSyncBindings_SelectorRegexAndNormalize(t *testing.T) {
+	t.Parallel()
+
+	db, err := gorm.Open(sqlite.Open("file:"+t.Name()+"?mode=memory&cache=shared"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&model.Provider{}, &model.Binding{}); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+
+	p1 := model.Provider{Name: "p1", Type: "openai", Group: "rg", Models: "moonshot/kimi2,kimi2"}
+	p2 := model.Provider{Name: "p2", Type: "openai", Group: "rg", Models: "moonshot/kimi2"}
+	if err := db.Create(&p1).Error; err != nil {
+		t.Fatalf("create provider1: %v", err)
+	}
+	if err := db.Create(&p2).Error; err != nil {
+		t.Fatalf("create provider2: %v", err)
+	}
+
+	// Regex should match uniquely (moonshot/kimi2 only).
+	bRegex := model.Binding{Namespace: "ns", PublicModel: "kimi2", RouteGroup: "rg", SelectorType: "regex", SelectorValue: "^moonshot/kimi2$", Status: "active"}
+	if err := db.Create(&bRegex).Error; err != nil {
+		t.Fatalf("create binding regex: %v", err)
+	}
+
+	// Normalize_exact should match p2 (moonshot/kimi2) for "kimi2".
+	bNorm := model.Binding{Namespace: "ns", PublicModel: "kimi2-n", RouteGroup: "rg", SelectorType: "normalize_exact", SelectorValue: "kimi2", Status: "active"}
+	if err := db.Create(&bNorm).Error; err != nil {
+		t.Fatalf("create binding normalize: %v", err)
+	}
+
+	mr := miniredis.RunT(t)
+	rdb := redis.NewClient(&redis.Options{Addr: mr.Addr()})
+	svc := NewSyncService(rdb)
+	if err := svc.SyncBindings(db); err != nil {
+		t.Fatalf("SyncBindings: %v", err)
+	}
+
+	// Regex binding should include both providers mapped to moonshot/kimi2 (p1 also has it).
+	raw := mr.HGet("config:bindings", "ns.kimi2")
+	var snapRegex bindingSnapshot
+	if err := json.Unmarshal([]byte(raw), &snapRegex); err != nil {
+		t.Fatalf("unmarshal regex: %v", err)
+	}
+	if snapRegex.Upstreams[jsonID(p1.ID)] != "moonshot/kimi2" || snapRegex.Upstreams[jsonID(p2.ID)] != "moonshot/kimi2" {
+		t.Fatalf("unexpected regex upstreams: %+v", snapRegex.Upstreams)
+	}
+
+	// Normalize_exact binding should include p2 but exclude p1 due to multi-match (moonshot/kimi2 + kimi2).
+	raw = mr.HGet("config:bindings", "ns.kimi2-n")
+	var snapNorm bindingSnapshot
+	if err := json.Unmarshal([]byte(raw), &snapNorm); err != nil {
+		t.Fatalf("unmarshal normalize: %v", err)
+	}
+	if snapNorm.Upstreams[jsonID(p2.ID)] != "moonshot/kimi2" {
+		t.Fatalf("expected p2 upstream, got %+v", snapNorm.Upstreams)
+	}
+	if _, ok := snapNorm.Upstreams[jsonID(p1.ID)]; ok {
+		t.Fatalf("did not expect p1 upstream due to normalize multi-match, got %+v", snapNorm.Upstreams)
+	}
+}
+
+func jsonID(id uint) string {
+	return strconv.FormatUint(uint64(id), 10)
+}